] 22 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Pontonia grayi, sp. nov. 
Rostrum reaching middle of the penult segment of the antennular peduncle. Antennal spine 
slender, sharp, inclined upward. Antennal scale reaching the end of the antennular peduncle. Large 
cheliped of second pair with small cup-shaped carpus; palm compressed, 
dilated, nearly twice as long as broad; daetylus a little longer than the 
width of the palm, narrow, cylindrical, with a large tooth at the basal 
third fitting between two large teeth on the pollex, which is broad and 
flat. Dactyls of last three legs slightly curved and with a subterminal as 
well as a terminal spine. 
Length of female with ova, 20.5 mm.; length of carapace, 8.8 mm. 
Nine specimens were taken between San Antonio Bridge and San 
Geronimo, San Juan, Porto Rico, by Mr. G. M. Gray (types, Cat. No. 
23789); a very small specimen without claws, and of seemingly the same 
species, was dredged by the Fish Hawk off Vieques Island, in 16 fathoms, 
station 6092. 
This species is in general appearance remarkably like P. domestica 
Gibbes, which has, however, the dactyli of the last three pairs of feet 
strongly curved and with a strong basal protuberance, a character which throws it into the genus 
Conchodytes, according to Borradaile. Pontonia mexicana Guerin is represented with a much shorter 
and less slender rostrum and smaller antennal scale. It also attains a larger size (length, 35 mm.). 
Genus CORALLIOCARIS Stimpson. 
(Edipus Dana. Crust. U. S. Expl. Expect., I, 572, 1852. (Preoccupied.) 
Corattiocaris Stimpson, Proc. Acad. Nat. Sci. Phita., xii, 38 (107), 1860. 
Rostrum long or moderate, with or without dentations, usually somewhat depressed, shallow, at 
most only slightly bent downward, flagella of first antenna of moderate length, thicker of the two 
.bifid; scale of second antenna long, broad; flagellum of same not short; second maxilliped with last 
joint as broad as or broader than penultimate joint, which bears it terminally; third maxilliped with 
antepenultimate joint moderately broad, last two joints of about the same breadth as, and together as 
long as or longer than, the antepenultimate; chelse of second pair large; dactyls of last three legs short, 
strong, curved, with a large basal protuberance on under side. (Borradaile. ) 
Coralliocaris atlantica, sp. nov. 
Rostrum in a line with the dorsal surface of the carapace, serrated above, with four teeth, all in 
front of orbital sinus; below unarmed; extremity acuminate; reach- 
ing middle of penult segment of antennular peduncles. Eyes sub- 
spherical, not reaching penult segment of antennular peduncle; cornea 
of lesser diameter than stalk and situated on its antero-external 
surface. Antennular peduncles extending beyond the eyes to a 
distance equaling length of eye-stalks; flagella fringed with setae. 
Carpus and propodus of first pair of feet subequal and a little shorter 
than merus; palm and fingers subequal; carpus increasing in width 
distally; fingers setose; chelse broadest in middle, tapering tow r ard 
carpus and toward finger tips. Palm of right cheliped of second pair 
about twice as long as broad; upper margin straight; lower margin 
slightly inclining toward upper distally; fingers about half as long 
as palm; pollex triangular, broad at base, slender at tip; daetylus 
narrow and curved; carpus cup-shaped, less than half as long as 
palm. Left cheliped of second pair missing. In the last three pairs 
of feet the propodus is half again as long as carpus and has a few 
spinules on its lower side near extremity. Daetylus very short and stout, with a moderate protuber- 
ance. on lower side. 
Length, 5.5 mm. 
Type locality, off St. Thomas, 20 to 23 fathoms, station 6079, 2 specimens (Cat. No. 23788). 
Rostrum, much enlarged. (/>) 
Right cheliped of second pair, x 
10. (c) Daetylus of one of last 
three pairs of legs, much enlarged. 
Fig. 25 . — Pontonia grayi. (a) 
Female, anterior portion, x 
5.33. (6) Daetylus of one of 
last three pairs of legs, much 
enlarged. 
