72 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Microphrys bicornutus (Latreille). 
Pisa bicornvla Latreille, Encye. M6th„ Hist. Nat., Insectes, x, 141, 1825. 
Microphrys bicornutus A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat.., viii, 247, 1872; Crust.. Reg. Mex., 61, pi. xxv, figs. 2-4, 
1873, and synonymy. 
Carapace not. very hairy, all raised parts covered with rounded tubercles; a single small, 
epibranchial spine directed outward. No preoeular spine. Basal antennal joint with a tooth on the 
outer margin behind spine. The line of tubercles along posterior margin is strongly curved upward 
near the middle. The arm has a few rounded tubercles above. Chelipeds spotted, the spots not 
disappearing in alcohol. Fingers moderately gaping. Ambulatory legs fringed with hair; a little 
rough on the margins. The species varies much in the amount of tuberculation and in the length and 
divergence of the horns. 
Color, yellowish brown. 
Dimensions of male: Length, 27 mm.; width, 21 mm.; length of horns, 4.3 mm. 
Bahamas and Florida Keys to Brazil; Bermudas. A very common species on coral reefs. Porto 
Rico: Mayaguez, on coral reef; Mayaguez Harbor; Boqueron Bay; Puerto Real; Guanica Bay, on 
coral reef; reefs at Ponce; Arroyo; Caballo Blanco Reef, Vieques; Culebra; Hucares; Fajardo; San 
Juan (G. M. Gray coll.); Aguadilla (Gundlach). 
Microphrys platysoma (Stimpson). 
Mil.nia platysoma Stimpson, Ann. Lye. Nat, Hist. N. Y., vii, 180, I860. 
Microphrys platysoma A. Milne Edwards, Crust. Reg. Mex., 62, 1875. 
Carapace depressed, tuberculate and granulate; two laminiform processes on antero-lateral 
margin, one on hepatic region, the other on branchial, the latter not projecting in an imbricated 
manner; between these processes and below their level there is a spine; two branchial spines, one of 
which is on the postero-lateral angle and the other farther in but on the same transverse line. On 
the posterior margin is a row of tubercles which grow larger toward the middle. Rostral horns 
slender, directed forward, about one-sixth the length of rest of carapace. Antennal spines about half 
the length of rostral; preocular spine acute, half the length of antennal. The arm has a dentated 
laminate superior crest; wrist tuberculate; palm less than twice as long as broad; fingers widely 
gaping, the pollex being strongly curved downward. The ambulatory legs are sparsely hairy and 
have a few spines and tubercles; propodal joints with a prominent rounded distal laminiform process 
for articulation of dactylus. 
Dimensions of male from Lower California: Length, 17.2 mm.; width, 13.7 mm.; length of rostral 
horns, 2.5 mm. 
Mayaguez Harbor, 4 to 6 fathoms, station 6065; Boqueron Bay, on coral reef; off Vieques, 14 
fathoms, station 6085. This species has not before been found on the Atlantic coast. Stimpson 
described it from Cape St. Lucas, and Professor Bouvier records it from Lower California. The Porto 
Rican specimens have been compared directly with some of those collected by Mr. Diguet in Lower 
California. 
Genus STENOCIONOPS Leach. 
Stenocionops Leach in Desmarest, Diet. Sci. Nat., xxvm, 266, 1823. 
Pericera Latreille, Encyc. Metli., Hist. Nat,, Insectes, x, 699, 1825. 
Carapace subpyriform, rather convex, with dorsal surface uneven, tuberculated or spinous; lateral 
margins armed with a series of long spines; preocular spine well developed. Rostrum composed of 
two strong spines which are not deflexed and are divergent from base; orbits tubular, not strongly 
projecting; eyes small, retractile within orbits. Basal antennal joint considerably enlarged, armed 
with one or two small distal spines or tubercles not visible in a dorsal view. The merus of outer maxil- 
lipeds with distal margin truncate, antero-internal angle emarginate, antero-external angle rounded or 
subacute. Chelipeds in adult male well developed; palm elongate and subcylindrical or somewhat 
compressed, not dilated or enlarged; fingers either without any or with a moderate intermarginal 
hiatus at the base when closed. Ambulatory legs moderately elongated, with joints subcylindrical, 
without spines; dactyli nearly straight. Abdomen in male distinctly seven-jointed. 
