146 RATHBUN 



7 to 20 fathoms. The specimen in hand is from the coral reef at 

 Maceio, Alagoas ; like the type it is an adult male, but smaller ; the 

 carapace is cracked, so that it cannot be accurately measured. 



The ground color is a deep crimson, covered with narrow and 

 closely interlacing stripes of white, leaving small irregular interstices 

 of crimson. The stripes are narrower and the interstices smaller near 

 the margin of the carapace. Chelipeds similar in coloring. On the 

 ambulatory legs the white stripes are broken, forming small irregular 

 detached patches of white ; the propodal joints have three narrow 

 transverse bands of white, two at the proximal end, and one near the 

 distal end. 



P. serratus is closely allied to, if not identical with, P. amcctius 

 (Guerin). 



PISOSOMA RIISEI Stimpson. 



Pisosoma rm<'/ Stimpson, Ann. Lye. Nat. Hist. N. Y., vii, 75, 1859. 

 Pisosonia glabra Kingsley, Proc. Acad. Nat. Sci. Phila., xxxi, 406, pi. xiv, 

 fig. 2, 1879 [1880]. 



Coral reef, Maceio, Alagoas ; two females. 



In these specimens the front is not the same : in one the upper 

 margin is nearly straight, in the other more advanced at the middle. 

 In the one cheliped present, the carpus is about as broad as long, op- 

 posed to Kingsley's figure rather than to his description ; the inner 

 margin is sinuous. The palm is subtriangular, wider at the base of 

 the dactylus than its inner length. The outer marginal crest of the 

 palm is continued two-thirds the length of the carpus, and on that seg- 

 ment is more or less tuberculous or broken up by oblique rugte. 

 Dactylus with a small basal tooth, which when the fingers ai-e closed, 

 fits against a tooth on the propodus between the two fingers ; upper 

 margin with a longitudinal groove on the basal half. Fingers gaping. 

 The types of P. glabra Kingsley, with which these have been com- 

 pared, are smaller, the fingers shut tight and their tips cross ; the in- 

 ner margin of the carpus is more distinctly dentate. 



Di}ne7isio7is of female bearing eggs. — Length 4.5 mm. ; breadth 

 5.3 mm. 



Color. — A beautiful light crimson, with a small white spot on the 

 lobe above the antenna and behind it on the margin a larger white 

 spot; these two spots unite below the dorsal surface forming a white 

 band extending to the cheliped. A small white dot on the branchial 

 region adjoining the cardiac region. Chelipeds crimson, tips of 

 fingers white. Ambulatory legs crimson with white bands, a narrow 

 one at either end of the propodus and a wide one covering the proxi- 

 mal half of the merus. 



