118 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Pantomus parvulus A. Milne Edwards. 
Pantomus parvulus A. Milne Edwards, Reoueil de Figures de Crustacea nouveaux ou peu connus, pi. 26, 1883. 
Rostrum longer than carapace, terminal half ascending. Anterior half of carapace carinated and 
armed with three spines, the two posterior being nearer together and movable, the anterior situated 
at articulation of rostrum; three spines on basal half of rostrum, increasing in size from the posterior 
to anterior. Lower margin armed with numerous slender overlapping spines. Tip bifid. Antennal 
scale reaching two-thirds the length of rostrum. Outer maxillipeds and first pair of thoracic feet 
reaching end of antennal scale. One foot of second pair longer than first pair, carpus with fifteen to 
seventeen articles; the other foot of second pair shorter than first pair, carpus with ten to twelve 
articles. Third, fourth, and fifth pairs subequal, exceeding the second pair. Third abdominal 
segment carinated in its posterior half; sixth segment elongate, 2.5 times as long as fifth. 
Length of ovigerous female, station 2403, about 30 mm. 
Mayaguez Harbor, 75 to 76 fathoms, station 6063, 1 specimen; Mayaguez Harbor, 97 to 120 
fathoms, station 6067, 1 specimen. 
Distribution: Northern part of Yucatan Bank, latitude 23° 13 / N., longitude 89° 16' W., 84 
fathoms, station 36, Blake (type locality); off Frederickstadt, Santa Cruz, 248 fathoms, station 134, 
Blake (Faxon); Gulf of Mexico, off Cape San Bias, Fla., 88 fathoms, station 2403 ( Albatross ); off 
Cape Lookout, N. C., 124 fathoms, station 2602 (Albatross) . 
Family ATYID^E Kingsley, 1878. 
Carapace dorsally smooth; scale of second antennae short. Mandibles with a molar process and 
cutting edge, but no palp. Third maxillipeds four-jointed and pediform. First and second trunk-legs 
chelate with spoon-shaped fingers; carpus of second pair not subdivided. Telson flattened, truncate. 
Key to the Porto Rican genera of the family A tyidie. 
A. Pereiopoda with exopodites. Carpal joints of first two pairs not distally excavated Xiphocaris 
A'. Pereiopoda without exopodites. Carpal joints of first two pairs distally excavated. 
B. Both fingers of each hand subequal in size; no palma developed Atya 
B'. Movable fingers shorter than the immovable part of the hand, the latter distinctly divided into a palmar 
portion and an immovable finger Ortmannia 
Genus XIPHOCARIS von Martens. 
Xiphocaris von Martens, Arch. f. Naturg., xxxvm, pt. 1, 139, 1872; Ortmann, Proc. Acad. Nat. Sci. Phila. 1894, 400. 
Rostrum slender, compressed, dentate, usually long. All the pereiopoda slender and with 
exopodites; carpal joints of first two pairs without a distal excavation, articulating in a normal way 
with the proximal end of the propodus. Abdomen with sixth segment elongate; telson slender, 
truncate at tip. 
Xiphocaris elongata (Guerin). 
Hippolyte elongata Guerin, in La Sagra’s Hist. Cuba, vol. vn, p. xx; vol. vm, pi. n, f. 16, 1857. 
Xiphocaris elongata von Martens, Arch. f. Naturg., xxxvm, pt. 1, 140, 1872; Ortmann, Proc. Acad. Nat. Sci. Phila. 1894, 400, 
and synonymy. 
In typical specimens the rostrum is from 1 to 1.66 times as long as the remainder of the cara- 
pace, its carina prolonged only a little way on carapace; horizontal for its basal fifth, then inclined 
upward at an angle of about 30 degrees; upper margin armed in its basal, horizontal portion with ten to 
fifteen crowded spines, remainder entire; lower margin armed with numerous spines beginning near 
anterior end of superior row and extending to the extremity, which is obliquely truncate and armed with 
a few spines. Carapace behind anterior fifth smooth and rounded. An outer orbital tooth present. 
Second segment of peduncle of the inner antennae 1.5 times as long as the third. Upper and outer 
flagellum as long as rostrum, its basal half thickened; inner and lower flagellum slender, longer than 
carapace and rostrum. Flagellum of outer antenna as long as body; scale reaching to middle of 
rostrum, its sides parallel, extremity rounded, prolonged a considerable distance beyond outer spine. 
First pair of feet reaching to end of first antennular segment; second pair more slender and reaching to 
