92 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Genus CALLIANASSA Leach. 
Callianassa Leach, Edin. Encyc., vu, 400, 1814. 
Integument soft, except of the chelipeds. Eyes triangular or oblong; cornese small. Flagella of 
antennulse exceeding but little their peduncles. Outer maxillipeds operculiform, with the ischium and 
merus exceeding in width the carpus and propodus. Second pair of trunk feet chelate; fifth pair with 
rudimentary chelae. Second pair of pleopods slender and filamentous; following three pairs broad 
and foliaceous. Pleopods fringed with small hairs. 
Key to the Porto Rican species of the genus Cattianassa. 
A. Pollex of large cheliped without a sharp crest on outer surface marginata 
A'. Pollex with a sharp crest on outer surface minima 
portion, x 5.33. ( d ) Maxilliped, x 12.8. 
Callianassa marginata, sp. nov. 
Carapace a little less than a third of length of body, measured from tip of rostrum to end of 
telson. Rostrum a conical acuminate spine extending beyond eyes. A short angular projection of 
the frontal margin just above antennae. The carpal and propodal joints of the outer maxilliped do 
not exceed half the width of ischium and merus joints. The propodal joint in its proximal portion 
equals greatest width of carpal joint, but becomes narrower distally. Ischium of large cheliped armed 
below with irregular slender spines, which become larger toward distal end. Merus narrow, suboval, 
unarmed. Carpus subtriangular, with very thin, sharp margins, forming very sharp distal angles. 
Manus with same acute margins. Palm longer than fingers. Fingers with a few shallow teeth on 
their prehensile edges. The seventh abdominal segment has a median longitudinal groove and is 
bilobed at extremity, with a small point in the sinus between the lobes. Caudal laminae narrow- 
oblong, the inner about three-fifths the length of outer. Outer branch of outer plate nearly as long as 
inner branch and intimately fused with it. 
Length of male from tip of rostrum to tip of telson, 18.8 mm. ; length of carapace, 5.7 mm. ; length 
of hand of a smaller specimen, female, 3.6 mm.; length of palm, 2 mm.; length of carpus, 1.3 mm. 
Types, Mayaguez Harbor, 161 to 172 fathoms, sand and mud, station 6066, 4 specimens, all 
imperfect (Cat. No. 23778). The largest lacks the chelipeds. Also taken at Mayaguez Harbor, 75 to 
76 fathoms, station 6063, and in 22 to 33 fathoms, station 6064; off Aguadilla, 137 fathoms, station 6055. 
This species in its unarmed, margined chelae resembles C. longivenlris A. Milne Edwards, from 
Martinique, but is distinguished by its non-terminal cornea, bilobed tail, small size, etc. 
Callianassa minima, sp. nov. 
Carapace about one-third the length of body. Rostrum a slender spine, a little longer than 
eye-stalks, and inclined downward. Cornea near end of eye-stalk. Ischial and meral joints of outer 
maxillipeds rather narrow for the genus, propodal joint not dilated, terminal joint oval-lanceolate. Large 
