86 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
beaded edge, somewhat crenulate; a short tooth at lateral angle. Outer surface of chelipeds granulate 
and tuberculate; margin of arm expansion with two teeth; a crest on palm continuous with it. LTpper 
margin of palm seven or eight- toothed; surface with two or three longitudinal crests of larger granules 
near the base. 
Dimensions of male: Extreme length, 40 mm.; width, 43.2 mm.; width at lateral tooth, 40.5 mm. 
Spanish Wells, Bahamas, 6 fathoms; west Florida, 211 fathoms; Old Providence; Cape St. Lucas 
(type locality); Panama Bay, 33 fathoms. Ponce, 1 male, 1 female (Fish Hawk). 
Family MATUTID^ McLcay, 1838. 
The afferent channels to the branchiae open behind the pterygostomian regions and in front of 
the chelipeds. Antennae small. Outer maxillipeds completely closing the buccal cavern and with the 
palpus concealed beneath the triangular, acute merus joint. The verges of the male are exserted from 
the bases of the fifth pair of legs. 
Genus HEPATITS Latreille. 
Hepatus Latreille, Hist. Nat. Crust., in, 22, 1802. 
Carapace broad, convex, regularly arcuate in front, strongly narrowing behind; hepatic regions 
very large, branchial regions very small. Front narrow, straight, rather prominent, and situated 
much above the level of the lateral border of carapace, which is prolonged beneath the orbits to join 
the margin of buccal cavity. Orbits small, circular, on a level with front. Antennulae very oblique. 
Antennae at inner angle of orbit. Buccal cavity very narrow forward and triangular, extending as far 
as level of lower border of orbits and entirely covered by outer maxillipeds, of which the merus 
is triangular and has straight inner margin, under which are concealed the following segments. 
Chelipeds strong, and when flexed fit closely against lower surface of body. Hands with a superior 
crest, fingers inclined a little downward and inward. Ambulatory legs smooth, unarmed. Abdomen 
with seven separate segments. 
Hepatus princeps (Herbst). 
Cancer princeps Herbst, Natur. Krabben u. Krebse, 11 , 154, pi. xxxvm, f. 2, 1794. 
Calappci augustata Fabricius, Entom. Syst., Suppl., 347, 1798. 
Hepatus fasciatus Latreille, Hist. Nat. Crust., v, 388, 1803. 
Anterior margin of front thick, obtuse. The line which descends obliquely from the external 
orbital angle to anterior border of carapace is faintly marked. Antero-lateral margins divided into 12 
or 13 teeth more or less rectangular, and denticulate on their margins. Outer face of hands with 
several rows of tubercles. Dactyli with a coating of fur, excepting for a narrow, smooth line on either 
side. Carapace covered with small, dark-colored spots, often arranged in transversely arcuate lines. 
Dimensions of male: Length, 58.5 mm.; width, 85.5 mm.; width between outer orbital angles, 
18 mm.; width of front, 14 mm. 
Taken at San Juan Harbor in fish trap and at Puerto Real on coral reef. Mayaguez (Gundlach.) 
Ranges from Georgia to Brazil; Guinea; Cape of Good Hope (Herklots) ; East Indies (Herbst). 
Family LEUCOSIIDtE Leach, 1819. 
The afferent channels to branchiae open at anterior-lateral angles of endostome. Antennae small. 
The third maxillipeds completely close the buccal cavern and have the three terminal joints wholly 
concealed by the triangular fourth joint. The verges of the male are exserted from the sternal plastron. 
Key to the Porto Rican genera of the fam ily Leucomdse. 
A. Carapace ovoid or globular, and smooth or granular, never nodular or eroded : Perscphona 
A'. Carapace polygonal, uneven, nodular or eroded. 
B. Antennulary fossse in open communication with orbits. Carapace not produced laterally over bases of 
ambulatory legs Ebalia 
B'. Antennulary fossse separated from orbits. Carapace produced laterally over bases of ambulatory legs. 
C. Posterior portion of the carapace either without deep cavities, or if with cavities they are bridged over 
by a narrow strip extending from cardiac to branchial region Lithaclia 
C'. Posterior portion of the carapace with two deep, smooth cavities extending into the interior of cara- 
pace and not spanned by a narrow bridge SpeUXophorus 
Genus PERSEPHONA Leach. 
Persephona Leach, Zool. Misc., in, pp. 18 and 22, 1817. 
Carapace ovoid or globular, terminating posteriorly in three spines — two on, and one in the middle 
line immediately above, posterior border. Surface of carapace smooth or granular, never nodular or 
