104 
BULLETIN OE THE UNITED STATES FISH COMMISSION. 
Tribe CARIDEA. 
Body generally laterally compressed. Antennules with a three-jointed peduncle, usually fur- 
nished with an external basal spine and two or three flagella. Antennal scale generally well developed. 
External maxillipeds generally pediform. ( )ne or both of the first two pairs of feet may he chelate, 
the three posterior pairs always simple. Abdomen long, the sides produced downward. Gills 
phvllobranchiate. 
Family LYSMATIDT (Kingsley, 1X78, Lysmatinae). 
NIKI DTE Bate, 188S. 
Rostrum horizontal with the dorsal surface of the carapace; mandibles without a cutting edge 
and without palp; first pair of trunk-legs more or less chelate, and stronger than the second, but not 
so long; second minutely chelate, with carpus subdivided. 
Genus PROCESSA Leach. 
Processa Leach, Mai. Podoph. Brit., text to pi. xu, July 1 , 1815. 
Nika Risso, Hist. Nat. Crust. Nice, 84, J 816. 
Rostrum short. Antennuhe biflagellate. Of the flagella of the antennulse, one is long, the 
other short. One of the trunk-legs of the first pair chelate, the other simple. Carpus of second pair 
elongate, multiarticulate. 
Processa canaliculata Leach. 
Processa canaliculata Leach, Mai. Podoph. Brit., pi. xi.i, and corresponding text, July 1. J815. 
Nika edulis Risso, Hist. Nat. Crust. Nice, 85, pi. hi, f. 3, 181G. 
Nika bermudensis Rankin, Ann. N. Y. Acad. Sci., xii, 536, pi. xvn, f. 2, 1900. 
Carapace smooth. Rostrum slender, about half as long as eye-stalks, unarmed except at apex, 
which is obscurely bifid and furnished with a few long hairs. On the anterior margin of the carapace 
a spine below the eye. Antennal scale as long as antennular peduncle. Antennal peduncle reaching 
about to the end of second joint of antennular peduncle. First pair of feet rather stout, reaching a 
little beyond antennal scale. Right or chelate foot with the palm a little longer than carpus or fingers. 
Left foot of first pair with dactyl us about one-fourth the length of propodus. Remaining feet slender 
and long. Second pair unequal in length. Meral joints of third and fourth pairs armed beneath with 
sharp, slender spinules. American specimens have the legs more slender than in the European speci- 
mens with which I have compared them. They resemble in that respect the variety of N. edulis, which 
Bell named N. couchii. 
Europe; Madeira (Stimpson); Japan (Ortmann); off North Carolina, 32 and 25 fathoms, stations 
2605 and 2606 ( Albatross ) ; Marco, Fla., 1 to 3 fathoms ( FI. Hemphill, coll. ) ; Key West, Fla. ( H. Hemp- 
hill, coll.); west coast of Florida, 17 and 45 fathoms, stations 5066 and 5119 (Grampus)', Gulf of Mexico, 
off Cape San Bias, Fla., 25 and 111 fathoms, stations 2370, 2373, and 2402 (Albatross); Old Providence, 
West Indies (Albatross) ; Bermudas ((1. Brown Goode, coll.), also recorded by Rankin. Porto Rico: 
Boqueron Bay; off Vieques, 122 fathoms, station 6095. 
Family ALPHEID 4 E Milne Edwards, 1837 (Alpheens); Kingsley, 1878 (Alpheinae); Bate, 1888. 
Rostrum minute or of moderate size; eye-stalks short and usually more or less covered by the 
projection of the frontal margin of the carapace; mandibles with a cutting edge distinct from the molar 
process and a one or two jointed palp; first pair of trunk-legs robustly chelate, often unsymmetrical, 
the second pair long and slender, minutely chelate, with carpus subdivided. 
Key to the Porto Rican genera of the family Alpheidsv. 
A. Eyes covered by carapace. 
B. Carapace not cristate. 
C. Thoracic feet with epipods. Propodus of large cheliped compressed Alpheus 
O'. Thoracic feet without opipods. Propodus of large cheliped cylindrical Synalpheus 
B'. Carapace cristate fousscaumea 
A'. Eyes with stalks projecting well in advance of carapace Automate 
