ISSN 0303-2515 DECEMBER 1975 VOLUME i ZRH ON MAR 2 197b LIBRARIES INSTRUCTIONS TO AUTHORS 1. MATERIAL should be original and not published elsewhere, in whole or in part. When accepted, copyright becomes the property of the Trustees of the South African Museum. 2. LAYOUT should be as follows: (a) Masthead to consist of Title: informative but concise, without abbreviations and not includingthe names of new genera or species Author’s (s’) name(s) Address(es) of author(s) (institution where work was carried out) Number of illustrations (figures, enumerated maps and tables, in this order) (b) Abstract of not more than 200 words, intelligible to the reader without reference to the text (c) Table of contents giving hierarchy of headings and subheadings (d) Introduction (e) Subject-matter of the paper, divided into sections to correspond with those given in table of contents (f) Summary, if paper is lengthy (g) Acknowledgements (h) References (ij) Abbreviations, where these are numerous 3. 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REFERENCES cited in text and synonymies should all be included in the list at the end of the paper, using the Harvard System (ibid., idem., loc. cit., op. cit. are not acceptable): (a) Author’s name and year of publication given in text, e.g.: ‘Smith (1969) describes...’ ‘Smith (1969: 36, fig. 16) describes...’ ‘As described (Smith 1969a, 1969b; Jones 1971)...’ ‘As described (Haughton & Broom 1927)...’ ‘As described (Haughton et al. 1927)...’ Note: no comma separating name and year pagination indicated by colon, not p. names of joint authors connected by ampersand et al. in text for more than two joint authors, but names of all authors given in list of references (b) Full references at the end of the paper, arranged alphabetically by names, chronologically within each name, with suffixes a, b, etc. to the year for more than one paper by the same author in that year, e.g. Smith (1969a, 19695) and not Smith (1969, 1969a). For books give title in italics, edition, volume number, place of publication, publisher. For journal article give title of article, title of journal in italics (abbreviated according to the World list of Scientific periodicals. 4th ed. London: Butterworths, 1963), series in parentheses, volume number, part number (only if independently paged) in parentheses, pagination (first and last pages of article). Examples (note capitalization and punctuation) BuLLouau, W. S. 1960. Practical invertebrate anatomy. 2nd ed. London: Macmillan. FIscHER, P.-H. 1948. Données sur la résistance et de le vitalité des mollusques.—J. Conch., Paris 88: 100-140. FiscHER, P.-H., DuvAL, M. & Rarry, A. 1933. Etudes sur les échanges respiratoires des littorines.—Archs Zool. exp. gén. 74: 627-634. Konan, A. J. 1960a. Ecological notes on Conus (Mollusca: Gastropoda) in the Trincomalee region of Ceylon.— Ann. Mag. nat. Hist. (13) 2: 309-320. Kon, A. J. 19606. Spawning behaviour, egg masses and larval development in Conus from the Indian Ocean.— Bull. Bingham oceanogr. Coll. 17 (4): 1-51. THEELE, J. 1910. Mollusca: B. Polyplacophora, Gastropoda marina, Bivalvia. In: SCHULTZE, L. Zoologische und anthropologische Ergebnisse einer Forschungsreise im westlichen und zentralen Siid-Afrika 4: 269-270. Jena: Fischer.— Denkschr. med.-naturw. Ges. Jena 16: 269-270. : (continued inside back cover) ANNALS OF THE SOUTH APRIGCAN MUSEUM ANNALE VAN DIE SUID-AFRIKAANSE MUSEUM Volume 69 ~~ Band December 1975 Desember Part 1 Deel ADDITIONAL HYDROIDS FROM THE SEYCHELLES by N. A. H. MILLARD & J. BOUILLON Cape Town Kaapstad The ANNALS OF THE SOUTH AFRICAN MUSEUM are issued in parts at irregular intervals as material becomes available Obtainable from the South African Museum, P.O. Box 61, Cape Town 8000 Die ANNALE VAN DIE SUID-AFRIKAANSE MUSEUM word uitgegee in dele op ongereelde tye na beskikbaarheid van stof Verkrygbaar van die Suid-Afrikaanse Museum, Posbus 61, Kaapstad 8000 OUT OF PRINT/UIT DRUK 1, 2(1, 3, 5-8), 3(1-2; 4-5, t=pi), 5(-2, 5, 7-9), 6(1, t--p.i.,'7(1=3), 8, 9(1-2), 10(1), 11(1-2, 5, 7, t=pi.), 15(5), 24(), 27, 310-3), 33 Price of this part/Prys van hierdie deel R2,00 Trustees of the South African Museum © Trustees van die Suid-Afrikaanse Museum 1975 ISBN 0 949940 71 2 Printed in South Africa by In Suid-Afrika gedruk deur The Rustica Press, Pty., Ltd., Die Rustica-pers, Edms., Bpk., Court Road, Wynberg, Cape Courtweg, Wynberg, Kaap ADDITIONAL HYDROIDS FROM THE SEYCHELLES By N. A. H. MILLARD South African Museum, Cape Town & J. BOUILLON Universite Libre de Bruxelles (With 3 figures) LMS. accepted 16 April 1975] ABSTRACT This paper supplements an earlier one on the hydroids of the Seychelles and records ten more species. In addition three new species are described, namely Egmundella modesta, Hebella muscensis and Scandia tubitheca. The last two have identical trophosomes but different gonosomes, and arising from this it becomes necessary to consider Campanularia costata Bale, 1884 and Campanularia corrugata Thornely, 1904 as nomina oblita since these were both described on sterile material. CONTENTS PAGE Introduction : 3 ; ; ‘ ; 1 List of species . ‘ , : : : Z Systematic section . : : : p 3 Acknowledgements . : : t ; 14 References . : , ; : : ; 14 INTRODUCTION The hydroids described in this paper were collected by the secona author during an expedition to the Seychelles Archipelago from June to September 1972. This expedition was financed by the Belgian ‘Fonds National de la Recherche Scientifique’, the Belgian Ministry of Education and Culture, the ‘Musée Royal de I’Afrique Centrale’ (Tervuren, Belgium) and the University of Brussels. The collection is the property of the ‘Musée Royal de l’Afrique Centrale’, where the types of new species have been deposited. During a previous mission, in 1966, a large quantity of marine invertebrates was collected and from the interest their study aroused we were led to consider another expedition in order to complete our observations and extend them to some islands of the archipelago never before prospected or scarcely so. As for the hydroids, one paper has already been published by Millard & Bouillon (1973) and another by Bouillon (1974). The present account expands our knowledge of the hydroid fauna of this area. 1 Ann. S. Afr. Mus. 69 (1), 1975: 1-15, 3 figs. 2) ANNALS OF THE SOUTH AFRICAN MUSEUM LIST OF SPECIES Additional to those described by Millard & Bouillon (1973), together with localities. Those species marked with an asterisk will be discussed further in the pages which follow. Family Asyncorynidae Asyncoryne ryniensis Warren A small fertile colony growing inside a dead Pecten shell, and bearing several young medusae with cnidophores. Dredged between ‘Silhouette and Mahé. Family Cladocorynidae Cladocoryne floccosa Rotch A large number (over 60) of infertile polyps from Praslin growing on sponges. Family Pandeidae * Amphinema ?rugosum (Mayer) A small fertile colony from Anse la Mouche. Family Campanulinidae *Egmundella modesta sp. nov. Family Haleciidae *Campalecium cirratum (Haeckel) Three rich and fertile colonies from Anse la Mouche and Praslin. Family Lafoeidae * Hebella muscensis sp. Nov. * Scandia tubitheca sp. nov. Family Syntheciidae * Hincksella corrugata Millard An infertile colony from Bird Island. * Hincksella cylindrica pusilla Ritchie Several stems reaching a maximum height of 8,7 mm from Bird Island. Family Sertulariidae * Dynamena obliqua Lamouroux An infertile colony from Bird Island. *Sertularella diaphana (Allman) A fragment of an infertile stem 1,1 cm in length from Praslin. Sertularia distans (Lamouroux) An infertile colony from Bird Island. ADDITIONAL HYDROIDS FROM THE SEYCHELLES 3 Family Plumulariidae Pycnotheca mirabilis (Allman) Two infertile stems from Bird Island. In addition new information is provided for the following species: Family Bougainvilliidae * Silhouetta uvacarpa Millard & Bouillon A fertile colony dredged between Silhouette Island and Beau Vallon on Mahé Island, from which newly released medusae were obtained. Family Campanulinidae *Phialella quadrata (Forbes) A fertile colony from Anse la Mouche growing on the stem of Halocordyle disticha. Family Syntheciidae *Synthecium patulum (Busk) Three fertile colonies, one dredged between Silhouette Island and Beau Vallon on Mahé Island, and two from Anse la Mouche. SYSTEMATIC SECTION Family Bougainvilliidae Silhouetta uvacarpa Millard & Bouillon, 1973 Silhouetta uvacarpa Millard & Bouillon, 1973: 25, fig. 3A—D, pls 2-3. Description Newly released medusae reaching a maximum size of approximately 0,9 (depth) « 1,0 mm (diameter) possess four oral tentacles with one dichotomy, and four marginal tentacles. The branching oral tentacles confirm the inclusion of this species in the Bougainvilliidae. Family Pandeidae Amphinema ?rugosum (Mayer, 1900) Fig. [A-D Amphinema rugosum: Rees & Russell, 1937: 67, figs 5-6. Russell, 1953: 183, fig. 90, pl. 10 (fig. 3), pl. 11 (figs 2, 4). Kramp, 1965: 29. Description Solitary hydranths and medusa-buds arising separately from a creeping hydrorhiza. Hydrorhiza with firm perisarc, about 0,03 mm in diameter. Hydranths up to 3 mm in height, with one row of 10-12 filiform tentacles, contained within a firm perisarcal tube for most of length. Perisarcal tube slender and annulated at base, smooth for the rest and widening distally. 4 ANNALS OF THE SOUTH AFRICAN MUSEUM AN =, = mM A aM =e ae Va ci F F-H Fig. 1. Amphinema ?rugosum. A. Part of a colony sketched from a combination of several damaged hydranths. B—D. Views of medusa-buds from whole mounts, right one viewed from above, showing two tentacles, hypostome and radial canals. Egmundella modesta sp. noy. E-H. Views of hydranthophores and nematothecae. Scale in mm/10. ADDITIONAL HYDROIDS FROM THE SEYCHELLES 5 Medusa-buds on short pedicels contained in wrinkled perisarc, oval, with four radial canals and two opposite marginal bulbs bearing coiled tentacles. No oral tentacles. Measurements (mm) Perisarcal tube, height on se 2 ae .. 1,41-2,53 diameter at base... os me Bs Se .. 0,02-0,04 diameter at distal end a A Hs A .. 0,09-0,13 Medusa-bud, height .. ae Be ie reaching 0,23 diameter... aa oe a: int reaching 0,20 Remarks The medusa-buds, with their two stout marginal bulbs, resemble the genus Amphinema, in which the hydranths of A. dinema and A. rugosum are known (Rees & Russell 1937). Of the two this material is closer to A. rugosum, which has stronger perisarc annulated at the base. Both species of medusa occur in the plankton; A. dinema is rare and A. rugosum very abundant. Family Campanulinidae Egmundella modesta sp. nov. Fig. 1E-H Lovenella sp.: Millard & Bouillon, 1973: 42, fig. SE-F. Holotype: an infertile stolonial colony from Anse la Mouche. Description Hydrothecae borne singly on the summit of pedicels of variable length. Pedicel increasing in diameter from base to distal end; with thicker perisarc at the base and thinner distally; annulated irregularly, with 2—7 distinct annulations at base and above this smooth or with faintly corrugated areas or with groups of annulations, distal end always smooth. Hydrotheca deep-campanulate, rounded at base, narrowed above this and widening again at margin. A definite diaphragm present. Operculum of about eight triangular segments clearly demarcated from thecal wall. Nematothecae scattered on hydrorhiza, one-chambered, obovate to globular, sessile, containing a cluster of large nematocysts. Hydranth with 15-18 tentacles in the few extended individuals present, with no intertentacular web. Measurements (mm) Pedicel, length a a = Ae if .. 0,14-0,71 diameter at base .. ae os a pS .. 0,03-0,05 Hydrotheca, depth .. ef; fe Ms a .. 0,20-0,33 diameter at margin ee a aie oe .. 0,08-0,11 Nematotheca, depth .. ee oe a as .. 0,04-0,05 maximum diameter. . age eM tt ma .. 0,02-0,04 6 ANNALS OF THE SOUTH AFRICAN MUSEUM Fig. 2. Phialella quadrata. A. Gonotheca containing medusa-buds. B. Hydrotheca. Campalecium cirratum. C. Hydranthophores with hydranths and gonotheca. D. Gonotheca with medusa-bud ready to escape. E. Microbasic mastigophore, discharged and undischarged. Scale: A—D in mm/10, E in mm/100. ADDITIONAL HYDROIDS FROM THE SEYCHELLES ii Remarks This species differs from £. amirantensis in the presence of a well-developed and annulated thecal pedicel and in the sessile nematothecae. The material is similar to that described by Millard & Bouillon (1973) as ?Lovenella sp. Re-examination of this earlier material has established the presence of nematophores in the samples from Praslin although in the original preparation it was not possible to relate them with certainty to the same hydrorhiza. The structure of the hydrotheca with its diaphragm and well-demarcated opercular segments distinguishes EF. modesta.from other species of Egmundella. Indeed the hydrotheca is similar to that of Lovenella and the only character definitely distinguishing the hydranth generations of these two genera is the presence of nematothecae in the former. Phialella quadrata (Forbes, 1848) Fig. 2A-B Hypsorophus quadratus: Huvé, 1952: 38, figs 3-7. ?Phialella quadrata: Millard & Bouillon, 1973: 43, fig. SG—J. Description Colony stolonial. Hydrothecae similar to those described from Mahé in 1973 and measurements within range. Gonothecae present, elongated and truncated distally, reaching 0,57 mm in length and 0,24 mm in maximum diameter, containing two medusa-buds, one large and one small. Larger medusa-buds deep, with at least two marginal bulbs and tentacles. Remarks The presence of gonothecae, which are exactly like those illustrated by Huvé, supports the identification of this material. Family Haleciidae Campalecium cirratum (Haeckel, 1879) Fig. 2C-E Halecium simplex Pictet, 1893: 22, pl. 1 (figs 16-17). Ritchie, 1910: 807, pl. 77 (figs 10-11). Campalecium medusiferum Torrey, 1902: 48, pl. 3 (figs 26-29). Huvé, 1954: 183, pls 7-9. Eucheilota cirrata: Brinckmann, 1959: 82, figs 1-3. Lovenella cirrata: Kramp, 1961: 177; 1968: 80, fig. 215. Campalecium simplex: Rees & Thursfield, 1965: 112. Description Hydrorhiza reticular or forming long unbranched threads on the surface of sponges and polyzoans, giving rise to hydranthophores at intervals. 8 ANNALS OF THE SOUTH AFRICAN MUSEUM Hydranthophores usually solitary and with a single terminal hydranth, occasionally with one or two sympodial branches; often regenerated. Pedicel constricted at base, of very variable length. Hydrotheca with straight walls widening to margin, with a circle of refringent nodules marking attachment of hydranth. Hydranth very large, with 24~-30 tentacles and an intertentacular web. Gonotheca arising from side of pedicel below hydrotheca, curved, widening to truncated distal end, containing three or four medusa-buds one above the other. Oldest medusa-bud with four perradial marginal bulbs of which two bear tentacles and are slightly larger than the others, and eight adradial statocysts. Although the margin is rather crumpled, in the largest medusa a marginal cirrus is clearly visible next to three of the large marginal bulbs, and four interradial cirri can be identified on rudimentary marginal bulbs. Large nematocysts (microbasic mastigophores) present in intertentacular web and in gonophores, 33,6 x 7,2 — 36,0 x 9,0 uw. Capsule banana-shaped. Butt with length approximately equal to that of capsule, bearing a raised spiral ridge with small spines on the proximal region. Several other types of nematocyst present in tentacles, but undischarged. Measurements (mm) Pedicel, length - on oe a es .. 0,07-0,99 diameter at base .. a Wye ek i .. 0,04-0,08 Hydrotheca, depth .. ie: a: ne oe SS 0,02 diameter at margin 4p a a Be .. 0,10-0,14 Gonotheca, depth NE BS Hi a i, .. 0,41-0,77 maximum diameter. . oe ue be ies .. 0,23-0,38 Remarks Brinckmann (1959) reared medusae of Lovenella cirrata (Haeckel, 1879) from the polyp Haleciella microtheca Hadzi, 1914, which latter Huvé (1954) included as a synonym for Campalecium medusiferum Torrey, 1902. Rees & Thursfield (1965) synonymized Campalecium medusiferum with Halecium simplex Pictet, 1893 after re-examination of Ritchie’s material (1910) of the latter species from Mergui. They used the name Campalecium simplex. However, they gave no description of the gonophores and did not comment on Ritchie’s statement that the gonangium contained ‘ova to the number of about six’. Recently the first author, by the courtesy of the Royal Scottish Museum, Edinburgh, was able to re-examine Ritchie’s slides (nos. 1959. 33. 162-171). Although it was not possible to decipher details of structure, the gonothecae clearly contained medusa-buds and not eggs as described and illustrated by Ritchie. We, therefore, confirm Rees & Thursfield’s synonymy, but point out that of the available specific names cirratum Haeckel, 1879 antedates simplex Pictet, 1893, medusiferum Torrey, 1902 and microtheca Hadi, 1914. Although the genus name Lovenella Hincks, 1868 has precedence over ADDITIONAL HYDROIDS FROM THE SEYCHELLES 9 Campalecium Torrey, 1902, we do not feel that the former can be stretched to contain a Haleciid polyp, and therefore retain the name Campalecium. We are here faced with a species in which the polyp generation belongs to one family (Haleciidae) and the medusa to another (Lovenellidae). The presence of microbasic mastigophores in the species supports the idea of an affinity between the Haleciidae and the Campanulinidae suggested earlier by Millard (1975) and based on the presence of a Lovenellid medusa in Campale- cium and certain resemblances of hydranth and hydrothecal structure in the two families. These nematocysts, which are by no means common in the Athecata, occur also in Hydrodendron caciniformis (personal observation of first author) and Halecium halecinum (Weill 1934) among the Haleciidae, and in Eucheilota maculata and Eutonina indicans among the Campanulinidae (Werner 1968a, 19685). Werner suggests that their evolutionary forerunners are basitrichous isorhizas, which are often difficult to distinguish from them and which occur commonly in the Campanulinidae. The polyp generation of C. cirratum is known from the Mediterranean, the Indo-West Pacific (Moluccas, Mergui) and the eastern Pacific (California). This is the first record from the western Indian Ocean. These records, together with those of the medusa from the Mediterranean, various parts of the tropical Atlantic and Malaya (Kramp 1961, 1968), show the species to be circumtropical in distribution. Family Lafoeidae Remarks on Hebella corrugata and H. costata Campanularia corrugata Thornely, 1904 was described from a sterile colony from Ceylon. The type material of Campanularia costata Bale, 1884 from Port Darwin, with which species Billard (1941) synonymizes Hebella corrugata, was also sterile. Since the original description of these two species all material delegated to one or the other has been sterile, except for some empty and probably immature gonothecae described by Billard (1941). In 1973, however, Millard & Bouillon described gonophores in material from the Seychelles, which was attributed to Thornely’s species. Since the gonophores were fixed sporosacs and showed no medusoid characters, the species was transferred from Hebella to Scandia, thus: Scandia corrugata. ji In this second collection from the Seychelles, material is present with an identical trophosome—it cannot be distinguished from that described in 1973 on measurements or any other character—but with gonothecae containing well- developed medusa-buds. It is apparent, therefore, that there are two species with identical trophosomes and different gonosomes, one a Hebella and the other a Scandia. Since there is no means of telling to which of these Thornely’s and Bale’s species belong, the only immediate solution is to create two new species, and to regard Hebella corrugatum (Thornely 1904) and Hebella costata (Bale 1884) as nomina oblita. Sterile material cannot be identified, and all sterile records attributed to either of the two species should be disregarded. 10 ANNALS OF THE SOUTH AFRICAN MUSEUM Hebella muscensis* sp. nov. Fig. 3A-B Holotype: a fertile colony epizootic on Synthecium sp. from Anse la Mouche. Description Hydrotheca tubular, curved to one side, with 5—9 transverse annulations, with everted margin usually oblique to axis and lower on the shorter, more concave side. An annular thickening present round base, asymmetrically developed, pronounced on the shorter, more concave side and often not notice- able on the other. Pedicel short, not annulated, but occasionally with an indistinct node separating it from the hydrorhiza. Gonotheca borne on hydrorhiza on short pedicel, elongated, widening distally, often slightly curved, usually longer than hydrotheca, with transverse annulations which may be somewhat irregular, with an operculum of four segments, containing up to four medusa-buds one above the other. Medusa-bud with rounded hypostome, at least four marginal tentacles and a varying number of ocelli (usually eight). Measurements (mm) Pedicel length .. ae nis a 7 ct .. 0,08-0,17 Hydrotheca, depth, convex side - Me: cof .. 0,82-1,20 diameter at mouth .. a: iy a ae .. 0535—0'53 diameter/depth is sf 2 ee of -. 0;37=0;50 Gonotheca, length .. i ai as ee .. 1,04-1,42 maximum diameter. . a i; is ss .. 0,38-0,53 Scandia tubitheca sp. nov. Scandia corrugata: Millard & Bouillon, 1973: 60, fig. 8D—F (fertile colony only). Holotype: fertile colony from Amirante, Seychelles, epizootic on Synthecium dentigerum. Diagnosis Hydrotheca similar to that of Hebella muscensis. Gonotheca (only male known) also very similar, but wider distally and not curved, containing a single gonophore in the form of a fixed sporosac. Family Syntheciidae Hincksella corrugata Millard, 1958 Hincksella corrugata Millard, 1958: 181, fig. 5. Gravier, 1970: 116. Description Unbranched stems reaching 8,0 mm and with up to 10 hydrothecae. Structure similar to holotype, but dimensions all slightly less. * From Anse la Mouche: Bay of flies. ADDITIONAL HYDROIDS FROM THE SEYCHELLES 11 Fig. 3. Hebella muscensis sp. noy. A. Hydrothecae. B. Gonothecae containing medusa-buds. Synthecium patulum. C. Part of stem with a pair of gonothecae in narrow view. D. Part of hydrocladium. E. Gonothecae: a smooth one in narrow view, an annulated one in narrow view and a smooth one in broad view. Scale in mm/10. 1 ANNALS OF THE SOUTH AFRICAN MUSEUM Measurements (mm) Stem, internode length a om wy ay .. 0,41-0,74 Hydrotheca, length abcauline av ie ms .. 0,43-0,53 length adcauline, adnate part Ls by a 2. 0!30=0338 length adcauline, free part. . ae) a oe = 03020338 diameter at margin & ks oe me .. 0,35-0,41 Remarks H. corrugata has been reported from the western Indian Ocean from Natal to S.E. Madagascar (Gravier 1970). This record extends the range further north. The gonophores still await discovery. Hincksella cylindrica pusilla Ritchie, 1910 Sertularella cylindrica var. pusilla Ritchie, 1910: 817, pl. 77 (fig. 9). Hincksella cylNndrica pusilla: Millard, 1964: 22, fig. 6A—D. Cyclonia pusilla: Hirohito, 1969: 16, fig. 12. Description Stems normally unbranched, but one with a single lateral branch. Hydro- theca with a larger proportion adnate than the South African material described by Millard (1964), but otherwise very similar. Empty gonothecae present, arising from within hydrothecae, elongated and tapering distally. Measurements (mm) Stem, internode length iy oe ee < .. 0,26-0,59 Hydrotheca, length abcauline iu: wy ae .. 0,35-0,54 length adcauline, adnate part ae Pg Le .. 0,15-0,34 length adcauline, free part. . ae ae Be .. 0,28-0,41 diameter at margin as et in 53 .. 0,12-0,27 Gonotheca, length from hydrothecal margin Se2 Bie Say 0)57/7/ maximum diameter. . ee Bi ae cf . 2 20322-0335 Remarks This is the first discovery of gonophores in African material of the sub- species, and the shape is similar to that of the male gonophores described by Hirohito from Japan. Synthecium patulum (Busk, 1852) Fig. 3C-E Synthecium orthogonia: Bale, 1888: 767, pl. 17 (figs 1-5). Synthecium campylocarpum Allman, 1888: 78, pl. 37 (fig. 1). Synthecium patulum: Billard, 1925: 125, figs 2-3. Millard & Bouillon, 1973: 64, fig. 8J. Description Pinnate stems reaching 2,0 cm, with 1-3 pairs of hydrothecae between successive pairs of hydrocladia. ADDITIONAL HYDROIDS FROM THE SEYCHELLES 13 Gonothecae arising from within hydrothecae on stem or hydrocladia and rather different in appearance from those described in 1973, being longer and more compressed. The transverse annulations, which number up to 11, are restricted to the centre region and are visible only in side view unless the gonotheca is empty, when the appearance is similar to Bale’s diagram (1888: pl. 17 (fig. 5)). Within the same colony are gonothecae which have no annula- tions at all and are completely smooth. All gonothecae are male. Measurements (mm) Hydrotheca, length abcauline He a ae .. 0,36-0,50 length adcauline, adnate part - ie Be .. 0,48-0,63 length adcauline, free part. . av ae a .. 0,08-0,20 diameter at margin .. nee uy, as ee .. 017-022 Gonotheca, length .. ne nee ne es .. 1,38-1,84 breadth ae ae a te oye RA .. 0,56—-0,74 thickness .; a8 ae mes ie and .. 0,20-0,41 Remarks Although the gonothecae are more compressed than any previously illustrated for S. patulum or its synonyms, we do not feel justified in creating a new species for what is probably a variable feature. It is possible that the shorter and fatter gonothecae illustrated in 1973 were female. Family Sertulariidae Dynamena obliqua Lamouroux, 1816 Pasythea quadridentata var. balei Billard, 1907: 355, fig. 6. Dynamena obliqua: Millard, 1958: 184, fig. 6A. Description Stems reaching 6,6 mm, most of them with hydrothecal pairs ungrouped, some of them with one or two groups of two pairs. Hydrothecae smaller than those reported from Mocambique (Billard 1907) and from South Africa (Millard 1958), but shape very similar. Internal teeth present in most hydro- thecae, one adcauline and two latero-abcauline. Measurements (mm) Hydrotheca, length abcauline Su se Rea .. 0,20-0,24 length adcauline, adnate part te a oe .. 0,20-0,24 length adcauline, free part. . ate ey. bu .. 0,12-0,14 diameter at mouth .. ae ie 7 Ae .. 0,07—0,08 14 ANNALS OF THE SOUTH AFRICAN MUSEUM Sertularella diaphana (Allman, 1886) Thuiaria diaphana Allman, 1886: 145, pl. 18 (figs 1-3). Sertularella diaphana: Billard, 1925: 157, figs 22-24, pl. 7 (figs 12-14). Millard, 1958: 188, fig. 7C-D. Description This stem is unusual in that it rotates through 90° half-way up. Both stem and hydrocladia are more slender than the South African material (Millard 1958) and are close to Billard’s var. delicata (1925). The hydrocladia have only two or three hydrothecae to an internode. Remarks This species is known from the east coast of Africa, Mauritius and Madagascar, so its presence in the Seychelles is not unexpected. ACKNOWLEDGEMENTS The authors acknowledge with gratitude their indebtedness to Mr Kandi Jivan Shah and Mr S. Savy, Director of the Department of Agriculture, for their kindness, co-operation and constant help during the stay of the mission in the Seychelles Islands. REFERENCES ALLMAN, G. J. 1886. Description of Australian, Cape and other Hydroida, mostly new, from the collection of Miss H. Gatty.—J. Linn. Soc. (Zool.) 19: 132-161. ALLMAN, G. J. 1888. Report on the Hydroida dredged by H.M.S. Challenger during the years 1873-76. Part Il.—The Tubularinae, Corymorphinae, Campanularinae, Sertularinae and Thalamophora.— Rep. Voy. Challenger 1873-76 23(70): 1-90. BALE, W. M. 1884. Catalogue of the Australian hydroid zoophytes. Sydney: Australian Museum. BALE, W. M. 1888. On some new and rare Hydroida in the Australian Museum collection. — Proc. Linn. Soc. N.S.W. (2) 3: 745-799. BILLARD, A. 1907. Hydroides de Madagascar et du sud-est de l’Afrique. — Archs Zool. exp. gén. (4) 7: 335-396. BILLARD, A. 1925. Les Hydroides de l’expédition du Siboga. II. Synthecidae et Sertularidae. — Siboga Exped. 7b: 117-232. BILLARD, A. 1941. Note sur les Hydroides: Hebella costata (Bale) et H. corrugata (Thornely).— Bull. Soc. zool. Fr. 66: 13-15. BOUILLON, J. 1974. Description de Teissiera milleporoides, nouveau genre et nouvelle espéce de Zancleidae des Seychelles (Hydrozoaires; Athécates-Anthoméduses), avec une révision des Hydroides “‘Pteronematoidea”’.— Cah. Biol. mar. 15: 113-154. BRINCKMANN, A. 1959. Uber den Generationswechsel von Eucheilota cirrata (Haeckel 1879).— Pubbl. Staz. zool. Napoli 31: 82-89. GravierR, N. 1970. Etude des Hydraires epiphytes des Phanérogames marines de la région de Tulear (sud-oest de Madagascar).— Rec! Trav. Stn mar. Endoume-Marseille 10: 111-161. Hrrouito, Emperor of Japan. 1969. Some hydroids of the Amakusa Islands. Tokyo: Imperial Household. Huve, P. 1952. Revision des polypes Campanulinides mediterranéens.— Recl Trav. Stn mar. Endoume 4: 34-47. Huve, P. 1954. Hydranthea et Campalecium. Genres Mediterraneens aberrants d’Hydroides de la famille des Haleciides.— Rec! Trav. Stn mar. Endoume 13: 173-192. Kramp, P. L. 1961. Synopsis of the medusae of the world.—J. mar. biol. Ass. U.K. 40: 7-469. ADDITIONAL HYDROIDS FROM THE SEYCHELLES 15 Kramp, P. L. 1965. The Hydromedusae of the Pacific and Indian Oceans.— Dana Rep. 63: 1-161. Kranp, P. L. 1968. The Hydromedusae of the Pacific and Indian Oceans. Sections IJ and III. — Dana Rep. 72: 1-200. MILLarD, N. A. H. 1958. Hydrozoa from the coasts of Natal and Portuguese East Africa. Part I. Calyptoblastea.— Ann. S. Afr. Mus. 44: 165-226. MILLARD, N. A. H. 1964. The Hydrozoa of the south and west coasts of South Africa. Part II. The Lafoeidae, Syntheciidae and Sertulariidae.— Ann. S. Afr. Mus. 48: 1-56. MILLARD, N. A. H. 1975. Monograph on the Hydroida of southern Africa. — Ann. S. Afr. Mus. 68: 1-513. Miiiarp, N. A. H. & BOUILLON, J. 1973. Hydroids from the Seychelles (Coelenterata). — Annls Mus. r. Afr. cent. Sér 8vo (Sci. zool.) 206: 1-106. PicteT, C. 1893. Etude sur les Hydraires de la Baie d’Ambouine. — Revue suisse Zool. 1: 1-64. Rees, W. J. & RUSSELL, F. S. 1937. On rearing the hydroids of certain medusae, with an account of the methods used.—J. mar. biol. Ass. U.K. 22: 61-82. Rees, W. J. & THURSFIELD, S. 1965. The hydroid collections of James Ritchie.— Proc. R. Soc. Edinb. (B) 69: 34-220. RitcuiE, J. 1910. The marine fauna of the Mergui Archipelago, Lower Burma, collected by Jas. J. Simpson, M.A., B.Sc., and R. N. Rudmose-Brown, D. Sc., University of Aberdeen, February to May 1907.—The hydroids.—Proc. zool. Soc. Lond. 1910: 799-825. RUuSSELL, F. S. 1953. The medusae of the British Isles. Cambridge: University Press. THORNELY, L. R. 1904. Report on the Hydroida collected by Professor Herdman, at Ceylon, in 1902.— Rep. Govt Ceylon Pearl Oyster Fish. Gulf Manaar suppl. Rep. 8: 107-126. Torrey, H. B. 1902. The Hydroida of the Pacific coast of North America, with especial reference to the species in the collection of the University of California.— Univ. Calif. Publs Zool. 1: 1-104. WEILL, R. 1934. Contribution a l’étude des Cnidaires et de leurs nématocystes. I. Recherches sur les nématocystes. II. Valeur taxonomique du cnidome.—Tray. Stn zool. Wimereux 10: 1-347; 11: 349-701. WERNER, B. 1968a. Polypengeneration und Entwicklungsgeschichte von Eucheilota maculata (Thecata —Leptomedusae). — Helgoldnder wiss. Meeresunters. 18: 136-168. WERNER, B. 19685. Polypgeneration und Entwicklung von Eutonina indicans (Thecata— Leptomedusae). — Helgoldnder wiss. Meeresunters. 18: 384-403. i ri i Die en Li Aen Trg “ ears Nea ie a titi 11 viet 6. SYSTEMATIC papers must conform with the International code of zoological nomenclature (particularly Articles 22 and 51). Names of new taxa, combinations, synonyms, etc., when used for the first time, must be followed by the appropriate Latin (mot English) abbreviation, e.g. gen. n., sp. n., comb. n., syn. n., etc. An author’s name when cited must follow the name of the taxon without intervening punctuation and not be abbreviated; if the year is added, a comma must separate author’s name and year. The author’s name (and date, if cited) must be placed in parentheses if a species or subspecies is transferred from its original genus. The name of a subsequent user of a scientific name must be separated from the scientific name by a colon. Synonymy arrangement should be according to chronology of names, i.e. all published scientific names by which the species previously has been designated are listed in chronological order, with all references to that name following in chronological order, e.g.: Family Nuculanidae Nuculana (Lembulus) bicuspidata (Gould, 1845) Figs 14-15A Nucula (Leda) bicuspidata Gould, 1845: 37. Leda plicifera A. Adams, 1856: 50. Laeda bicuspidata Hanley, 1859: 118, pl. 228 (fig. 73). Sowerby, 1871: pl. 2 (figs 8a—b). Nucula largillierti Philippi, 1861: 87 Leda bicuspidata: Nicklés, 1950: 163, fig. 301; 1955: 110. Barnard, 1964: 234, figs 8-9. Note punctuation in the above example: comma separates author’s name and year semicolon separates more than one reference by the same author full stop separates references by different authors figures of plates are enclosed in parentheses to distinguish them from text-figures dash, not comma, separates consecutive numbers Synonymy arrangement according to chronology of bibliographic references, whereby the year is placed in front of each entry, and the synonym repeated in full for each entry, is not acceptable. In describing new species, one specimen must be designated as the holotype; other speci- mens mentioned in the original description are to be designated paratypes; additional material not regarded as paratypes should be listed separately. The complete data (registration number, depository, description of specimen, locality, collector, date) of the holotype and paratypes must be recorded, e.g.: Holotype SAM-A13535 in the South African Museum, Cape Town. Adult female from mid-tide region, King’s Beach, Port Elizabeth (33.51S, 25.39E), collected by A. Smith, 15 January 1973. Note standard form of writing South African Museum registration numbers and of date. 7. SPECIAL HOUSE RULES Capital initial letters (a) The Figures, Maps and Tables of the paper when referred to in the text e.g. ‘... the Figure depicting C. namacolus... *,..in C. namacolus (Fig. 10)...’ (b) The prefixes of prefixed surnames in all languages, when used in the text, if not preceded by initials or full names e.g. Du Toit but A. L. du Toit Von Huene but F. von Huene (c) Scientific names, but not their vernacular derivatives e.g. Therocephalia, but therocephalian Punctuation should be loose, omitting all not strictly necessary Reference to the author should be expressed in the third person Roman numerals should be converted to arabic, except when forming part of the title of a book or article, such as “Revision of the Crustacea. Part VIII. The Amphipoda.’ Specific name must not stand alone, but be preceded by the generic name or its abbreviation to initial capital letter, provided the same generic name is used consecutively. "Wii N. A. H. MILLARD & J. BOUILLON ADDITIONAL HYDROIDS FROM THE SEYCHELLES