58 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Key to the Porto Rican species of the genus Euprognatha. 
A. Interantennular spine equaling or surpassing the front rastetlifera 
A'. Interantennular spine not equaling the front gracilipcs 
Euprognatha rastellifera Stimpson. 
Euprognatha rastellifera Stimpson, Bull. Mils. Comp. Zool., n, 123, 1871; A. Milne Edwards, Crust. Reg. Mex., 3 S3, 1878, pi. 
xxxiii, f. 2, 1879; Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, iv, 253, 1898. 
Euprognatha rastellifera spinosa Rathbun, Prop. IT. S. Nat. Mus., xvn, 55, 1894. 
Carapace granulate, a tubercle or spine on the gastric, cardiac, and each branchial region and on 
supraorbital margin. Postorbital projection dentiform, tapering to a slender point. Frontal teeth 
short, triangular; basal antennal joint terminating in a slender spine directed obliquely forward and 
equally advanced with the front. Interantennular spine inclined downward, equaling or surpassing 
the front. A few small spines on sides of branchial and on hepatic and pterygostomian regions. 
Sternum regularly granulated, except on concave portion between the ehelipeds. Chelipeds nearly 
twice as long as carapace, granulate or spinous; man us swollen; lingers more than half the length of 
palm, gaping, though narrowly, for two-thirds their length. Ambulatory legs granulate, with tufts of 
curled setee and often small spines. 
Length of male, 14.4 mm.; width, 12 mm. 
From off Marthas Vineyard to the Gulf of Mexico and Caribbean Sea, in 15 to 387 fathoms. 
Mayaguez Harbor, Porto Rico, 220 to 225 fathoms, station 6070, 1 male, of the form described by me 
in 1894 as E. rastellifera spinosa, which may, however, represent the typical species. 
Euprognatha gracilipes A. Milne Edwards. 
Euprognatha gracilipp.s A. Milne Edwards, Crust. Reg. Mex., 184, 1878; pi. xxxv, f. 3, 1879. 
Branchial region less swollen and hepatic region more prominent than in E. rastellifera. 
Carapace densely granulous, the granules of varying size and intermixed with tubercles, of which 
there are live in a transverse row on gastric region. Gastric, cardiac, and branchial regions tipped 
with a cylindrical spine; a smaller abdominal spine. Hepatic region with a stout spine. Margins 
of branchial region and pterygostomian ridge armed with smaller spines and tubercles. Front 
having a deep median groove and terminating in two small triangulate teeth; spines of antennal joint 
slender, equaling or not quite reaching front; interantennal spine very short. Supraorbital arches 
very thick and well-marked, tipped with a spine directed diagonally forward and outward. Postorbital 
spines also much more oblique than in E. rastellifera. A wide prominent lobe diagonally across sides 
of epistome. Sternum covered with large tubercles. Sternum extended over bases of legs, forming 
crenate border around posterior portion of carapace. Chelipeds about 1 .5 times the length of carapace, 
slender, granulate. Margins of merus with short triangular spines. Fingers very slender and gaping. 
Ambulatory legs also with sharp granules, and tufts of curled hair above. 
Length of male, 8 mm.; width, 6.2 nnn. 
Gulf of Mexico, Florida Straits, and Caribbean Sea; depth 69 to 201 fathoms. Mayaguez 
Harbor, Porto Rico, 75 to 120 fathoms, stations 6063 and 6067. 
Genus ANASIMUS A. Milne Edwards. 
Anas! mus A. Milne Edwards, Crurt. Reg. Mex., 350, 1880. 
Carapace pyriform, very convex, armed with spines; rostrum simple, pointed, directed upward. 
Eyes large. Postorbital spine prominent. Supraorbital spine present. Basal article of outer antenna 
long and narrow, terminating in a spine. Exognath of outer maxillipeds broad posteriorly, very 
narrow anteriorly; merus of endognath narrow at its base, deeply cut at its antero-internal angle for 
insertion of palpus, and strongly aurieulate behind insertion. Chelipeds of moderate length, the 
palms swollen in male; lingers long, slender, and curved inward. Ambulatory legs very slender, of 
nearly equal length in typical forms and more than twice the length of carapace; dactyl i long and in 
typical species unarmed. 
