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Antennules seven-jointed; the second and third joints are considerably longer than the others, and the second joint is also dilated and armed with a strong conical tooth on the external aspect (fig. 3). The proportional lengths of all the joints are nearly as follows :— Proportional lengths of the joints... 17.22.28. Number ‘of the:jdinis \)..... 0.2... lise ise: Ba 6. 5; 4 5 Antenne strong; both the first and second joints are fringed with small sete on the inner edge ; secondary branch small, one-jointed (fig. 4). The second joint of the posterior foot- jaws 1s somewhat dilated and bears a powertul terminal claw. The inner branches of the first pair of swimming-feet are very strong; the first joint is of considerable length, being five times longer than broad, but the second is very short and is armed with a strong claw; the outer branches are slender, three-jointed, and about half the length of the first joint of the inner branches; the second basal joint is also densely hirsute, as shown by the drawing (fig. 6). ‘he second pair new and rare Crustacea from Scotland. 461 are slender; the outer branches are elongate and strongly spiniferous ; the second joint is rather shorter than the first and only two thirds the length of the last joint; the two- jointed inner branch does not reach to the end of the second joint of the outer branch ; the first joint is rather stouter than, but little more than half the length of, the second joint; the second joint bears four sete—the two apical and one of the marginal are very long, but the other is short (fig. 7). The third and fourth pairs are also slender and with short inner branches; in the fourth pair the first joint of the inner branches, which only reach to about the middle of the second joint of the outer branches, is so short as to be almost rudi- mentary (fig. 8). In the fifth pair the inner produced portion of the basal joint is somewhat cone-shaped and bears three moderately long and stout plumose setee on the inner margin and two smaller sete at the apex; the apex of the basal joint only reaches to about half the length of the secondary joint ; the secondary branch is elongate-ovate in form, being nearly three times longer than broad; the apex is lengthened into a narrow process, from the end of which springs a moderately long seta; on each side of this there is a subapical seta, also of moderate length, while three other sete spring from the distal half of the outer margin (fig. 9). Caudal stylets narrow and about equal in length to the last abdominal segment. Habitat. Port Erin, Isle of Man; and near the mouth of the River Alness, Cromarty Firth ; rather rare. Remarks. This Laophonte has a superficial resemblance to L. denticornis, T. Scott, but on closer examination it was found to differ very markedly, not only from that species, but from any other Laophonte known to us. Idya longicornis, sp. n. (Pl. XVII. figs. 10-17.) Description of the Species.—Female. Length 1°7 millim. (75 of an inch). ‘This form resembles [dya furcata, Philippi, in general appearance, but is larger. The antennules, which are eight-jointed, are very long and slender; the first four joints are elongate, especially the third and fourth, which are nearly of equally length, the fourth being slightly longer than the other; it is also longer than all the last four taken together. The formula shows the proportional lengths of all the joints— Proportional lengths of the joints.. 80.40.45.47.7.10.8.18 Number of the joints ............ Pewee A) Ads Gi BFF r 462 Messrs. TI’. and A. Scott on some The antennules are sparingly setiferous, and the long some- what slender filament springs from the end of the fourth joint (fig. 11). The antenne are slender, and the first and second joints are each provided with one seta, while the last bears a few sete at the apex (fig. 12). The mouth-organs are some- what similar to those of Jdya furcata, but the posterior foot- jaws have the terminal claws void of supplementary sete (fig. 18). The swimming-feet are also somewhat similar to those of Idya furcata, but the second joint of the outer branches of the first pair is about twice the length of the first joint, and the spine which springs from the outer distal angle of the first joint is comparatively slender (fig. 14). The fifth pair are also more elongate than those of /dya furcata, being fully four times longer than broad (fig. 17). Habitat. ast Loch Tarbert, Loch Fyne. Several speci- mens of this species were taken with the dredge in 5 to 6 fathoms water in February 1886, but have not been previously recorded. Remarks. Idya longicornis is easily recognized, not only by its larger size, but also and especially by the length and structure of the antennules. ‘lhe proportional lengths of the joints of the outer branches of the first pair of swimming-feet and the elongate fifth pair also serve to distinguish this from any other British form of Jdya. Though this ldya is the largest form of the genus with which we are familiar, the armature of the first pair of swimming-feet is not so powerful as that of the first pair in Jdya furcata, a much smaller species. We are not altogether unfamiliar with the lability of Juya furcata to variation, and also with the observations of several eminent naturalists on this liability to variation in Idya furcata; but we have seen no explanation that could account for the great differences between Jdya furcata and the species we have now described on the principal of local variation, for both forms were taken together by the dredge on the same ground and at the same time. Had the two forms been taken in different localities hundreds of miles apart, there might have been some reasonableness in con- sidering them merely as varieties of the one species; but, taken as they were, under similar conditions of time and place, we can only judge of the differences between them as we judge of the differences between forms belonging to other genera. ADDITIONAL NOTES. An interesting addition to the freshwater Crustacea of Scotland has only lately been obtained, viz. Ophiocamptus o «4 es cee ° new and rare Crustacea from Scotland. 463 (Canthocamptus) brevipes, G. O. Sars. It was discovered in some hand-net gatherings from Loch Lubnaig, Perthshire, collected in September last. A description, with drawings, of it will be published in the ‘Thirteenth Annual Report of the Fishery Board for Scotland.’ PSEUDOTHALESTRIS, G. S. Brady. Pseudothalestris, G. S. Brady, Report on the ‘ Challenger’ Copepoda, p- 100, pl. xlii. figs. 1-8 (1883). In the Report on the ‘ Challenger’ Copepoda Dr. Brady has described a new genus of the Harpacticide under the above name. He had only asingle specimen (a male), which he describes as being like Thalestris ; its characters were so marked, as to be of generic rank. This Copepod was obtained by Dr. Brady in a gathering from Betsy Cove, Kerguelen Island (lat. 49° 16’ S., long. 70° 12! E.). Last year one of the authors of this paper instituted a new genus— Pseudowestwoodia—tor the reception of a Copepod that closely resembled Westwoodia nobilis (Baird) in general appearance, but differed in some important structural details. The genus Pseudowestwoodia was described, with illustrative drawings, in the ‘Twelfth Annual Report of the Fishery Board for Scotland,’ published last year. Descriptions of other two species of the same genus were published by us in the ‘ Annals and Magazine of Natural History’ for January last. A short time ago, when looking over the Report on the ‘Challenger’ Copepoda, we happened to observe a certain resemblance between Dr. Brady’s Pseudothalestris and our Pseudowestwoodia ; a careful study of the two was then made, with the result that we believe them to be identical. It is unfortunate that Dr. Brady had only a single specimen (and a male) to describe from; had it been a female, the identity of the two genera would no doubt have been more clearly established. Though our name—Pseudowestwoodia—is more in accord with the general form of the British species of the genus, there can be no question as to the priority of Pseudo- thalestris. It is surely of much interest to find in this little group of Copepoda another instance of the remarkably close similarity between organisms living on opposite sides of the globe. eye 464 On some new and rare Crustacea from Scotland. EXPLANATION OF THE PLATES. PLATE XVI. Attheyella MacAndrewe, sp. n. Fig. 1. Female, seen from the side, X 80. 2. Antennule, x 380. 3. Pos- terior foot-jaw, X 506. 4. Foot of first pair of swimming-feet, x 880. 5. Foot of fourth pair, x 380. 6. Foot of fifth pair, x 3880. Canthocamptus palustris, var. elongatus, var. n. Fig.7. Female, seen from the side, x 80. 8. Antennule, x 169. 9. Antenna, X 266. 10. Mandible, x 380. 11. Posterior foot- jaw, X 400. 12. Foot of first pair, x 200. 18. Foot of fourth pair, X 135. 14. Foot of fifth pair, female, x 266. 15. Foot of fifth pair, male, x 253. 16. Spermatophore, x 380. 17. Last two abdominal segments and caudal stylets, x 190. PuaTE XVII. Laophonte propingua, sp. n. Fig. 1. Female, dorsal view, X 64. 2. Rostrum, x 380. 3. Antennule, x 800. 4. Antenna, x 253. 5. Posterior foot-jaw, x 258. 6. Foot of first pair of swimming-feet, X 253. 7. Foot of second pair, X 253. 8. Foot of fourth pair, x 169. 9. Foot of fifth pair, X 253. Idya longicornis, sp. n. Fig. 10, Female, dorsal view, x 24. 11. Antennule, x 66. 12. An- tenna, X 100. 18. Posterior foot-jaw, x 180. 14. Foot of first pair of swimming-feet, x 66. 15. Foot of third pair, x 66. 16. Foot of fourth pair, x 66. 17. Foot of fifth pair, x 180. Année: Mag. Nat-Hist.8.6.Vol.AW. PL. XVL Mintern Bros . hth. Figs ll to 14, C.Scott del. the others A.Scott del e Ann. & Mag. 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