490 



BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



Pisa galibica Desbonne, in Desbonne and Schramm, Crust. Guadeloupe, 



1867, p. 18 (tj'^pe-locality, Guadeloupe; cotype in Paris Mus.). 

 Pisa purpurea Desbonne, in Desbonne and Schramm, Crust. Guadeloupe, 



1867, p. 18 (type-locality, Guadeloupe; cotype in Paris Mus.). 

 Omalacantha hirsuta Streets, Proc. Acad. Nat. Sci. Philadelphia, ser. 3, 



vol. 1, 1871, p. 238 (type-locality, Isthmus of Panama; female holotype 



in Mus. Phila. Acad. Nat. Sci.). 

 Microphrys bicornutus A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat., 



vol. 8, 1872, p. 247; Crust. R6g. Mex., 1873, p. 61, pi. 14, figs. 2-4. 

 Microphrys bicornuta Kingsley, Proc. Acad. Nat. Sci. Philadelphia, vol. 31, 



1879, p. 386. 



Diagnosis. — Carapace tuberculate. A marginal spine at branchia 

 angle. A tubercle on margin of basal antennal segment behind 

 antero-external spine. Claws spotted. 



Description. — Carapace subtriangular, moderately hairy, all the 

 raised parts covered with rounded tubercles and two or three short 



spines on the branchial region; a spine 

 at the lateral angle, which is situated far 

 back. A line of four tubercles arches 

 upward on intestinal region. Rostrum 

 from a half to a third the length of the 

 remainder of the carapace; horns either 

 divergent throughout or divergent at base 

 with extremities curving inward. Spine 

 at anterior angle of basal segment of 

 antenna flat, obtuse; behind it on the 

 margin a tubercle or in the old a short 

 stout spine. Preorbital angle rectang- 

 ular. 



Chelipeds spotted, the spots persisting 

 in alcohol for many years. Arm with 

 three or four tubercles or short, blunt 

 spines above. Fingers gaping. 

 Legs hairy, margins a little rough. 

 Color. — Variable. Carapace often a dull yellowish brown or a 

 bright purplish rose; chelipeds grayish- white, covered with small, 

 round, purplish spots. 



Measurements. — Male (7580), total length of carapace 36.4, length 

 on median line 30.2, width with spines 26, without spines 23.6 mm. 



Habitat. — ^A very common species on coral reefs. It is often 

 disguised by the wealth of foreign objects, such as sponges, anemones, 

 hydroids, algae, etc., which become attached to it. 



Range. — Beaufort, North Carolina; Bahamas and Florida Keys 

 to Desterro, Brazil; Bermudas. The locality given by Latreille is 

 an error. 



Material examined. — See table, pages 491-495. 



Fig. 139.— microphrys bicornutus 

 (7580), maxilliped, x 8.4 



