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[ From the Report of the Peabody Academy of Science, 1869. ] te 3 /§ //
List of the Crustacea collected by J. A. MeNiel in Central -
America. By Srpney I. Smiru.
BRACHYURA.
MAIOIDEA.

Leptopodia debilis, sp. nov. Male. Carapax naked, or minutely
pubescent, and smooth; the branchial regions swollen. Rostrum
about twice as long as the posterior portion of the carapax, slender,
cylindrical, armed with a row of spines on each side, and sparsely

A122 he

88

hairy toward the extremity. A strong spine on the basal segment of
the antenna and a similar spine on each side just behind the orbit.
Chelipeds equal, slender, reaching nearly to the distal extremity of
the carpus of the first ambulatory legs; ischium with a few small
spines on the inner side; merus not quite as long as the hand,
cylindrical, armed with several spines along the sides, and with three
stout ones on the inner side at the articulation of the carpus; carpus
with two or three simall spines on the outer side, and two at the
distal extremity on the inner side; basal portion of the hand cylin-
drical and smooth, but thickly covered with a minute pubescence;
fingers nearly as long as the basal portion of the hand, sparsely hairy,
slender, nearly straight horizontally but curved inward laterally at the
tips, slightly channelled longitudinally, the prehensile edges approxi-
mate, toothed toward the base, and serrate toward the extremity,
the serrations of the dactylus fitting accurately those of the propodus.
Ambulatory legs slender, cylindrical, and slightly pubescent; meral
segments armed with scattered spines, most of which are on the distal
two-thirds of the length; carpi with two or three spines about the
middle, and four at the distal extremity; propodi armed with small,
scattered spines and spinules; dactyli beset with numerous spinules.
First segment of the abdomen nearly as long as broad; second
broader and very short; third broadest of all the segments, the lateral
margins projecting into angles next the second segment and rapidly
converging toward the fourth, which narrows very rapidly to the fifth ;
fifth segment twice as broad as long, the lateral margins at first
converging rapidly and then only slightly as they approach the sixth;
terminal article, which is composed of the sixth and seventh segments
completely anchylosed, about twice as long as broad, the extremity
angular but with the point rounded. Length of carapax, including
rostrum, 29.5™m; length of rostrum from tip to the posterior side
of orbit, 19.0; breadth of carapax, 9.9. Length of cheliped, 34.0;
hand, 14.8; dactylus, 7.0. Length of first ambulatory legs, 72.4 —
74.2; second, 71.8—74.2; third, 58.0; fourth, 50.5. <A single speci-
men from the Bay of Realejo.

There are specimens of this species in the Museum of Yale College,
collected at Panama and the Pearl Islands, by Prof. F. H. Bradley,
and among these, are females which agree pretty well with the figure
of Edwards’ and Lucas’ L. sagittaria from Valparaiso, JL. debdilis,
however, differs from the figures of the typical Atlantic sagittaria in
the much shorter chelipeds with proportionately much longer fingers,
and in the form of the maic abdomen, which is very different from
the figure of the Atlantic Z. sagittaria given by Edwards in the Régne
animal de Cuvier, and quite like the figure of the Valparaiso species
given by Edwards and Lucas.

89

CANCROIDEA.

Pancpeus validus Smith, Proc. Boston Soc. Nat. Hist., vol. xii, p.
278, 1869. <A single specimen collected in the Gulf of Fonseca.
Panopeus transversus Stimp., Annals Lyc. Nat. Hist., N. Y., vol. vii,
p. 210, 1860. One specimen from Corinto, west coast of Nicaragua.
Ozius integer, Sp. Nov. Male. Carapax broad, strongly convex in
front but flattened in the middle and posteriorly; anterior portion of
the mesogastric lobe narrow and bordered by deep sulci which fade
out before they reach the middle of the carapax; anterior portions of
the cervical sulci longitudinal, nearly parallel to the median sulci, and
fading out at the-same distance from the front; mesobranchial lobe
indistinctly circumscribed. Surface of the anterior portion of the
carapax, and along the margins even back of the lateral angles,
rugose and filled with deep pits as if ereded; median and posterior
regions smooth or minutely granulous. Front deflexed and trans-
versely channelled, nearly straight as seen from above, but. in a front
view, deeply undulated, with two median teeth, or lobes, which are
prominent, but obtusely rounded. Antero-lateral border with a con-
tinuous, slightly upturned margin, not toothed or lobed, but with
slightly marked elevations in the margin in place of the posterior
teeth. Postero-lateral border rounded and with a very slight tooth
just back of the lateral angle. Infero-lateral regions naked and
granulous. External maxillipeds nearly naked, the meral segments
granulous and longitudinally bisulcate. Chelipeds unequal; meral
segments short, not projecting beyond the carapax; carpal segments
unarmed, outer surface evenly rounded, but somewhat roughened as
if eroded; hands rounded, the upper and outer surfaces roughened
like the carpi, but in a much greater degree; fingers of the larger
hand widely gaping, nearly cylindrical, with a few, low, obtuse teeth
within; fingers of the smaller hand slightly channelled longitudinally
and their prehensile edges closely approximating. Ambulatory legs
slightly granulous and naked, except the propodi, which are a little
pubescent toward the distal extremities, and the dactyli, which are
stout, cylindrical, and completely covered, except the horny tips, with
a Short and very dense pubescence. The abdomen is broadest at the
third segment, which projects in an angle on each side between the
bases of the third and fourth ambulatory legs; from the third segment,
it tapers regularly to the middle of the sixth, which is nearly as long
as broad, with the lateral edges concave; the terminal segment is ~
broader than long and has the extremity rounded. Length of carapax,
15.0™m; breadth of carapax, 23.5; ratio of length to breadth; 1: 1.57.
A specimen collected at Aspinwall.

RAs Ss 12

90

Eriphia squamata Stimp., Annals Lyc. Nat. Hist., N. Y., vol. vii, p.
56, 1859, and p. 217, 1860. Collected at Corinto, Nicaragua.

Areneus bidens, sp. nov. Male. Carapax granulous and naked
above, except between the teeth of the antero-lateral margin and —
along the postero-lateral margin, where it is pubescent; gastric re-
gion and the posterior part of the branchial, more convex than in A.
cribrarius. Front with two prominent, slender, obtuse, median teeth
separated from each other by a deep and narrow sinus, and from the
inner angles of the orbits, by broad rounded sinuses. Orbit broken
‘above by two fissures, which are deeper than in A. cribrarius, and the
truncated tooth between them more slender. Teeth of the antero-
lateral border long and subcylindrical, the anterior ones obtuse, and
the posterior ones acutely pointed; the one next the lateral spine
hooked forward at the tip, and longer than the one in front of it; the
lateral spine slender, nearly straight, and almost or quite as long as
the space occupied by the four teeth in front of it. Infero-lateral re-
gions clothed with a long and dense pubescence. External maxilli-
peds, chelipeds, and ambulatory legs very much as in A. cribrarius; the
hands, however, are a little stouter, the teeth on the prehensile edges
of the fingers more slender and acute, and the spine on the outside of
the carpus is almost obsolete. Sternum flat posteriorly, and the
whole surface naked, minutely granulous, and sparsely punctate.
Terminal segment of the abdomen long and narrow, being twice as
long as broad, the extremity slender and acute. First pair of abdom-
. inal appendages slender, reaching to the tip of the abdomen, curving
inward near the base, then gently outward to beyond the middle, and
then inward again to near the very slender tips, which are straight.

The female differs very little from the male, but is somewhat thicker
and more convex, and the abdomen is broadly triangular as in A. erib-
rarius.

In coloration, alcoholic specimens resemble A. cribrarius, but the
reticulations seem to be finer and more irregular.

Several specimens give the following measurements : —

Length of Cara- |Breadth of Cara- Ratio of L th of
Sex. pax including |pax including lat- length to ASE au v©
frontal teeth. eral spines. breadth. BASH ET SiON
mm. mm. rn mm.
Male 24.4 60.0 1: 2.09° 9.8
Male 19.3 48.0 1: 2.48 7.0
Male 15.9 41.4 1: 2.60
Female 15.3 38.3 1: 2.50

Collected at Corinto, Nicaragua, in June and July, 1868.

91

A. cribrarius of the east coast, heretofore the only known species
of the genus, is at once distinguished from this species by the quad-
ridentate front, the much broader and stouter teeth of the antero-
lateral border, and by the much more slender terminal segment of the
male abdomen.

Callinectes, sp. A single young specimen of Callinectes collected in
the Gulf of Fonseca, agrees very well with Ordway’s description of
C. arcuatus, Boston Journal Nat. Hist., vol. vii, p. 578, 1863, except
there is only one distinct spine on the carpus of the chelipeds, the
inner ones being nearly obsolete. It may be an undescribed species,
but the specimen is too young for accurate determination.

OCYPODOIDEA.

Ocypoda Gaudichaudit Edwards and Lucas, Voy. de d’Orbigny dans
VAmér. mérid., Crust., p. 26, pl. 11, fig. 4, 1843. Collected in the Gulf
of Fonseca.

Gelasimus heterophthalmus Smith, Trans. Conn. Acad., vol. ii, p. 116,
pl. 2, fig. 6, pl. 3, fig. 1, 1870. Gulf of Fonseca.

Gelasimus heteropleurus Smith, loc. cit., p. 118, pl. 2, fig. 7, pl. 8, fig.
2. Gulf of Fonseca.

Gelasimus princeps Smith, loc. cit., p. 120, pl. 2, fig. 10, pl. 3, fig. 3.
Corinto, Nicaragua.

Gelasimus armatus Smith, loc. cit., p. 123, pl. 2, fig. 5, pl. 3, fig. 4.
Gulf of Fonseca.

Gelasimus ornatus Smith, loc. cit., p. 125, pl. 2, fig. 9, pl. 3, fig. 5.
The locality from which this species came is uncertain.

Gelasimus gibbosus Smith, loc. cit., p. 140, pl. 2, fig. 11, pl. 4, fig. 8.
Gulf of Fonseca.

Gecarcinus quadratus Sauss., Revue et Magazine de Zool., 2e. sér.,
tome v, 1853, p. 360, pl. 12, fig. 2; Stimp., Ann. Lyc. Nat. Hist., N. Y.,
vol. vii, p. 233, 1860. Collected at Corinto, Nicaragua.

Cardiosoma crassum Smith, Trans. Conn. Acad., vol. ii, p. 144, pl.
5, fig. 5, 1870. Gulf of Fonseca.

(2?) Goniopsis cruentatus DeHaan. There are two specimens of Goni-
opsis from the Gulf of Fonseca, which are apparently identical with
the Atlantic species, but I have had no opportunity for a careful com-
parison of males from the two coasts, and therefore do not feel quite
certain of the identity of the west coast specimens.

Pachygrapsus transversus Gibbes, Proc. Amer. Assoc. Adv. Sci., 3d
meeting, 1850, p. 181; Stimp., Ann. Lyc. Nat. Hist., N. Y., vol. vii, p.
64,1859. One specimen from the Gulf of Fonseca, which I am unable
to distinguish from specimens from the east coast. There are speci-
mens of the same species in the Museum of Yale College, collected at

92

Panama, and several other points on the Pacific coast, by Prof. F. H.
Bradley.

Sesarma sulcata Smith, Trans. Conn. Acad., vol. ii, p. 156. Co-

rinto, Nicaragua.

(?) Aratus Pisoni Edwards, Ann. des Sci. nat., 3me sér., 1853,
tome xx, p. 187; Sesarma Pisoni Edw., Hist. nat. des Crust., tome ii,
p. 76, pl. 19, figs. 4, 5. A specimen from Corinto, Nicaragua, appears
to belong to this species, but it has not been carefully compared with
east coast specimens.

LEUCOSOIDEA.
Leucosilia Jurinti Bell, Trans. Linn. Soc., vol. xxi, p. 295, pl. 32,
fig. 1, 1855. Corinto and Bay of Realejo.

ANOMOURA.
DROMIDEA.

Hypoconcha Panamensis Smith, Amer. Naturalist, vol. ili, p. 249,
1869. A large specimen from the Bay of Realejo.

PORCELLANIDEA.
Ptrolisthes armatus Stimp., Ann. Lyc. Nat. Hist., N. Y., vol. vii, p.
73, 1859. Gulf of Fonseca.

PAGURIDEA.

Clibanarius Panamensis Stimp., Ann. Lyc. Nat. Hist., N. Y., vol.
vii, p. 84, 1859. Gulf of Fonseca.

MACROURA.
THALASSINIDEA.

Gebia spinigera, Sp. nov. Female. Median tooth of the rostrum
broad, triangular; lateral teeth, slender, spiniform, separated from
the median by deep sulci, which extend back nearly to the ceryical
suture and leave, along the sides, sharp, narrow ridges. armed with a
single line of spinules; dorsal surface of the rostrum. two-thirds of
the way to the cervical suture, except a short median sulcus near the
tip, armed with sharp spines, which decrease in size posteriorly and
of which two at the tip are somewhat larger than the rest, and all
give rise to numerous short hairs. A slender spine on the anterior
border opposite the eye and just below the lateral spine of the rostrum;
cervical suture marked by a deep sulcus which is bordered poste-
riorly, along the side of the carapax, by a slight ridge armed with
two or three short spines on the hepatic region; cardiac and branch-
ial regions smooth and naked. Chelipeds equal; ischium and merus

93

smooth and naked, except a line of hairs along the lower edge; a
single slender spine on the lower side of the ischium, and, on the
merus, several very small ones in the same position, and a large acute
one on the upper side a little way from the distal extremity; carpus
short, a slight longitudinal sulcus on the outer surface, inner margin
denticulate and pubescent, with a small proximal and a large distal
Spine. both directed forward, spines on the distal extremity at the
outer and inferior angles, and another on the inner side; basal portion
of the propodus stout, subcylindrical, with longitudinal lines of
granules on the upper side, which give rise to hairs, and a slightly
oblique, narrow line of dense pubescence along the lower side; pro-
podus but little shorter than the dactylus, nearly straight, tapering
to a slender point, smooth, naked, and the prehensile edge armed,
near the base, with two or three, small, obtuse teeth; dactylus clothed
with long lines of pubescence and the prehensile edge armed with an
obtuse tooth near the base, and, near the tip, with a large slender one
which shuts just by the tip of the propodus; beyond this tooth the
extremity extends in a conical, horny tip about as long as the tooth.
Second thoracic legs ciliated along the inferior edge of the meri, and
along both edges of the propodi and dactyli; merus compressed and
armed with a slender proximal spine on the inferior edge and a similar
distal one on the upper edge; carpus unarmed, but slightly ciliated
within; propodus broad and compressed; dactylus short, triangular.
Third thoracic legs with a small spine above the genital orifice, a slight
one on the inferior edge of the ischium, and several on the inferior
edge of the merus; dactylus, propodus, and distal portion of the carpus
‘ciliated on the outer side and the inner edges; dactylus narrow and
about as long as the propodus. Fourth thoracic legs armed with
a row of spines along the inferior edge of the merus; the three last
segments much as in the third pair of legs. Fifth thoracic legs
slender, subcylindrical; propodus thickly ciliated on the anterior
side; dactylus slender and very short. Abdomen ciliated along the
edges of the third, fourth, and fifth segments, but smooth and naked,
above. Appendages of the sixth segment with a spine above at the
articulation of each lamella; lamelle smooth and carinated above,
the extremity of the outer one slightly arcuate, that of the inner trun-
cate, but slightly rounded at the inner angle. Terminal segment
quadrilateral, broader than long, the dorsal surface smooth and naked,
with slight lateral carinations and a median sulcus. Length of a speci-
men, from tip of rostrum to extremity of abdomen 4.10™™. Length of
carapax along the dorsal surface, 13.0. Length of hand, 9.5.

A large number of specimens, all females, collected at the Island of
Aseredoras, twenty miles northwest of Corinto, Nicaragua, March
14th, and a few from the Gulf of Fonseca, May, 1869.

94

CARIDEA.

Atya rvivalis, sp. noy. Male. Carapax compressed, naked, and
entirely smooth, except the gastric region which is punctate with
shallow puncta. Rostrum short, median carina sharp, high, extending
to the acutely triangular tip and separated from the lateral carinz by
deep sulci; lateral teeth right-angled, but not acute. Peduncle of the
antennula armed above with small spines; inner flagellum shorter
than the carapax, but much longer than the outer. Antennal scale
considerably longer than the peduncle, narrow, ovate at the tip, the
outer margin straight and armed with a very slender spine; flagellum
longer than the carapax. Legs of the first and second pairs equal
in size, smooth and naked, except the tips of the fingers; meral
segments compressed and longitudinally sulcate. Legs of the third
pair much stouter than the others and the meral, carpal, and propodal
segments thickly beset with small squamiform tubercles; propodus a
little longer than the carpus; dactylus short, unguiform, the basal
portion slightly thickened and armed beneath with several minute
spines. Legs of the fourth pair much more slender and not so
strongly tuberculate, but the carpus armed with one, and the merus
with two or three spines beneath. Legs of the fifth pair still more
slender, the propodus proportionately longer, and the merus and carpus
spined beneath as in the fourth pair. Abdomen smooth and naked;
lateral margins of the second, third, fourth, and fifth segments
truncate. Lamelle of the appendages of the sixth segment evenly
rounded at their extremities and projecting only slightly beyond the
terminal segment. Terminal segment narrow, the sides straight and
converging regularly to the truncate extremity, which is ciliated
and armed with minute spines; dorsal surface with a slight median
sulcus with lines of small aculei each side. Length from tip of rostrum
to extremity of abdomen, 40.6™m. Length of carapax, from orbit to
middle of posterior margin, 13.2; from tip of rostrum to middle of
posterior margin, 15.6; breadth of carapax, 6.8; height of carapax,
8.4.. Third thoracic legs, entire length, 27.5; merus 9.0; carpus,
3.6; propodus, 3.4; dactylus, 1.3.

Fresh water streams, Polvon, Occidental Department, Nicaragua.
Six specimens.

Atya tenella, sp. nov. Male. Carapax compressed, narrowed in
front, entirely naked, and smooth, or slightly punctate on the gastric
region. Rostrum longer than in the last species; terminal portion
acute, somewhat deflexed, and with a sharp carina both above and
below; lateral teeth obtusely rounded. Peduncle of the antennula
unarmed, except a few weak, bristle-like spines at the articulation

95

just in front of the eye; inner flagellum about as long as the carapax,
outer much shorter. Antennal scale regularly ovate at tip; flagellum
much longer than the carapax. Legs of the first and second pair
very much as in the last species. Remaining thoracic legs slender,
decreasing successively in size posteriorly, those of the third pair not
very much stouter than those of the fourth; all nearly naked and very
slightly spinulose, the meral and carpal segments in the fourth and
fifth pair armed beneath as in A. fivalis, and the dactyli as in that
species. Abdomen similar to that of A. rivalis, but the lamelle of the
appendages of the sixth segment are rather longer in proportion, and
the terminal segment is rounded instead of truncate at the extremity.
Length from tip of rostrum to extremity of abdomen, 62.0™™. Length
of carapax, from orbit to middle of posterior border, 18.2; length,
including rostrum, 22.8; breadth of carapax, 11.8; height of carapax,
14.8.

Six specimens from the same locality as the last species.

Evatya,gen.nov. Allied to Atya, but the body stout, not compressed ;
rostrum prominent, carinate, and armed above with stout spines;
anterior portions of the carapax with numerous scattered spines and
Spiny carinations; a spine on each side above the eye and three on
the anterior border at the base of the antenna. Thoracic legs of the
third pair very stout and tuberculate; the basis completely anchylosed
with the coxa, and the ischium so firmly united to the merus as to
admit of no motion between them; the propodus very much shorter
than the carpus; the dactylus short, unguiform, and so closely united
with the propodus as to admit of no motion, or only the very slightest,
at the articulation with it.

Hvatya crassa, sp. nov. Male and Female. Carapax stout, about
as broad as high, and with broad emarginations in the lateral margins
above the bases of the legs of the third pair. Rostrum as long as the
antennal scale, slightly curved downward, broad at base, and tapering
to an acute point; a broad carina above armed with six to eight stout
spines, about half of which are on the carapax back of the base of
the rostrum. Anterior half of the median portion of the carapax
armed with small spines which decrease in size posteriorly; two
vertical spines on each,side at the base of the rostrum, the anterior
one, just over the eye, very large and stout, the other smaller and
directly behind the first; a stout antennal spine directed upward,
and, just below it, two smaller spines in the margin; from the antennal
spine, a carina, somewhat broken in the middle and armed with a
single line of small spines, extends backward nearly to the cervical
suture; just above this, but more posteriorly, is a smaller broken line
of spines, which is connected with the spines on each side of the base
of the rostrum by a little group of several spines somewhat isolated

96

from the rest; posterior and lateral portions of the carapax coarsely
punctate and unarmed. Peduncle of the antennula armed above with —
small spines; inner flagellum stout, nearly as long as the carapax;
outer flagellum much less stout and not more than half as long as the
inner. Peduncle of the antenna smooth and unarmed; antennal scale
reaching a little beyond the peduncle, the outer margin thickened,
concave in outline, and armed with a very strong spine; flagellum
very stout and nearly twice as long as the carapax. Legs of the first
and second pairs about equal in size and very similar to those of the
the species of Atya just described, but all the segments more or less
hairy. Legs of the third pair greatly developed, even in the very
young, the two when placed together, side by side, being thicker than
the carapax; basis and ischium tuberculose and hairy beneath; merus
long and very stout, rounded without and flattened on the inner side,
the whole outer surface thickly beset with prominent, squamiform
tubercles, which show a tendency to an arrangement in longitudinal
lines, most of the tubercles giving rise at their bases to little tufts of
pubescence, the flattened inner surface unarmed, but densely hairy
along the lower edge; carpus nearly as broad as long, the upper
surface tuberculose like the merus, but the tubercles rather larger and
more crowded together, the inner and under surface densely hairy;
propodus very short, being broader than long, the outer surface with
close set, large tubercles like those on the distal end of the propodus,
the inner and under surface densely hairy; dactylus forming a stout,
cylindrical, horny claw, longer than the propodus, and curved strongly
downward. Legs of the fourth pair very much more slender, not
reaching, by considerable, the distal extremity of the merus of the
third pair, hairy along the inner side, and thickly beset with small
squamiform tubercles, which increase in prominence distally and
become slender spines at the extremity of the propodus; propodus
cylindrical and longer than the carpus; dactylus small, composed of a
thickened basal portion and a slender terminal claw, and unarmed
except a few minute spines on the under side of the basal portion.
Legs of the fifth pair like those of the fourth, but smaller, and the
propodi proportionately longer. Dorsal surface of the abdomen
evenly convex, naked, and closely punctate; first and second segments
with a strong lateral, submarginal carina, which is specially prominent
on the lateral expansions of the second; third to sixth segment with
the posterior lateral angles produced into conical points or spines.
Appendages of the sixth segment with a stout spine above the artic-
ulation of each lamella; lamelle very broad and slightly pubescent
above. Terminal segment, at base, nearly as broad as long, and
tapering rapidly to a truncate and spined extremity; upper surface
with a median sulcus toward the extremity, armed, on either side,

of

with a line of four or five aculei. Length of a male from tip of
rostrum to extremity of abdomen, 141mm. Jength of carapax from
orbit to middle of posterior border, 60.8; height of carapax, 29.5.
Length of rostrum, 16.4. Third thoracic legs, entire length, about 80;
merus, 42; carpus, 20; propodus, 7; dactylus, 10.

Young, less than 30 ™™. in length, do not differ from the large speci-
mens, except in having the third pair of thoracic legs a very little
less robust, and the spines of the carapax, etc., slightly less developed.

Fresh water streams, Polvon, and the ‘‘Rio Fulva, two and a half
miles northwest of Realejo;” both localities in the Occidental De-
partment of Nicaragua.

Leander gracilis, sp. nov. Female. Rostrum very long, strongly
curved upward in the middle of its course, and the terminal portion
very slender; the upper edge armed with eight or nine teeth, of which
six or seven are on the basal half and the others near the tip, and
the under edge with nine or ten small teeth, which decrease in size
anteriorly and become very minute near the tip. Outer flagellum of
the antennula slender and much longer than the entire body; inner
flagellum only slightly shorter. Flagellum of the antenna slender and
fully twice as long as the rest of the animal. First thoracic legs
reaching nearly or quite to the tips of the antennal scales, very
slender, and naked, except a few hairs on the fingers. Legs of the
second pair reaching to the tip of the rostrum, very slender and
nearly naked; hand, about three-fifths as long as the carpus, cylin-
drical, very slender and delicate, the fingers nearly as long as the
palmary portion. Abdomen rounded and smooth above, the lateral
portions of the first three segments with shallow vertical sulci, sixth
segment compressed laterally and about twice as long as the fifth.
Lamelle of the sixth segment very narrow, the extremities ovate,
the inner ones extending slightly beyond the tip of the abdomen,
the outer ones much longer. Terminal segment narrow and tapering
regularly to a very slender and acute point. A specimen with eggs
beneath the abdomen gives the following measurements: Length of
body from tip of rostrum to extremity of abdomen, 43.2mm. YLength
of carapax from orbit to middle of posterior margin, 7.5; length of
rostrum from tip to base of eyes, 11.7; length of basal scale
of antenna, 7.9; length of first thoracic legs, 12.6; length of second
thoracic legs, 17.0; merus, 3.5; carpus, 5.6; hand, 3.3; dactylus, 1.5.

“* Estero at Realejo,” west coast of Nicaragua.

Palemon Jamaicensis Olivier, Edwards, Hist. nat. des Crust., tome
li, p. 398; Martens, Wiegm. Archiv xxxv, 1869, p. 22. A large
number of specimens from Polvon, Occidental Department of Nic-
aragua, agree with the descriptions of this species and with a
Brazilian specimen. In several of the very large specimens the legs

Pp. A. S. 13

98

of the second thoracic pair are somewhat unequal, but in all of them
the fingers are nearly as long as the palmary portion of the hand, thus
differing from the P. brachydactylus of Wiegmann.

Palemon tenellus, sp. nov. Male. Rostrum very long, reaching far
in advance of the tips of the antennal scales, the basal half high,
curved somewhat downward, then beyond the middle curved strongly
upward, and tapering to a slender extremity; the upper edge armed
with eight to ten teeth, of which seven or eight are on the basal half
and the others near the tip, and the under edge with six or seven teeth.
Second thoracic legs slender and nearly smooth, except the fingers,
which are straight, slender, somewhat hairy, and not quite as long
as the palmary portion of the hand. Fifth segment of the abdomen
projecting into a sharp point at the posterior lateral angle. Sixth
segment less than a third longer than broad; the lamelle rather
narrow and evenly rounded at the extremities. Terminal segment
narrow and tapering to a triangular tip armed with small spines.
Length of body from tip of rostrum to extremity of abdomen, 96™™;
length of carapax from orbit to middle of posterior margin, 23.1;
length of rostrum, 23.9. Another specimen gives: Length of body,
83mm; carapax, 18.7; rostrum, 20.0; second thoracic legs, 41.0; merus
in second thoracic legs, 9.1; carpus, 12.1; hand, 10.5; page 4.8.

Polvon, Occidental Depahineat of Nicar agua.

Both of the second thoracic legs are preserved in no one of the
specimens, and those which are present seem very small and may have
been reproduced. This species is very much like P. Amazonicus
Heller, Sitzungsberichte der kaiser. Akad. der Wissenschaften, Wien,
xly, p. 418, pl. 2, fig. 45, 1862 (which is the same as P. ensiculus Smith,
Trans. Conn. Acad., vol. ii, p. 26, pl. 1, fig. 2, 1869), but is at once
distinguished from it by the terminal segment of the abdomen, which
has a triangular and spinous tip, instead of terminating in a very
' slender and acute point; the sixth segment also is not nearly so
narrow, and its lamelle are not so long and slender.

ANAC kA, March /(87/

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