NO. 2 MUD SHRIMPS SCHMITT 5 



II. Telson longer than broad ; third maxilHpeds narrow ; frontal margin without 

 lateral spines ; eyestalks flattened, cornea dorsal or lateral ; inner uropods 

 less than twice as long as wide. 



A. Telson with a pair of spines on the posterior half of either lateral margin, 



and a spine at middle of posterior margin; rostrum a little shorter than 

 the eyestalks; chelipeds and external maxillipeds unknown (off Som- 

 brero Island) bafei Borradaile." 



B. Telson laterally with several spinules, posteriorly unarmed ; upper border 



of carpus less than half as long as upper palmar border ; rostrum longer 

 than eyestalks; external maxillipeds narrow (Puerto Rico). 



minima Rathbun." 



CALLIANASSA (CALLICHIRUS) ISLAGRANDE, n. sp. 



A distinctive species. Lineae thalassinicae distinct; cervical groove 

 crosses the carapace at nearly one-fourth the length of the carapace 

 from the hinder margin. Rostral projection of front low triangular, 

 extending forward beyond the level of the blunt, inconspicuous lateral 

 projections by about one-fourth or one-fifth its width measured be- 

 tween those projections ; the rostrum reaches forward less than one- 

 third the length of the eyestalks, and these in turn reach between one- 

 fourth to one-third the length of the second segment of the antennular 

 peduncle. 



The eyestalks are dark brown, with black corneae, and are about 

 twice as long as broad ; their terminal one-third to two-fifths are each 

 drawn out into a slender spine slightly curved upward, and with the 

 tip very slightly exerted ; inner borders of eyestalks contiguous to about 

 the level of the anterior margins of the corneae ; the latter are opposite 

 the distal end of the second segment of the antennal peduncle. Fourth 

 segment of the antennal and second segment of the antennular 

 peduncles reach about equally far forward ; fifth or terminal segment 

 of antennal peduncle reaches about two-fifths the length of the distal 

 segment of the antennular pedimcle. 



Right cheliped of male much the larger ; remarkably long and 

 slender, quite the most striking character of this species ; the carpus 

 exceeds a little the propodus plus the dactyl, even when the latter is 

 extended straight forward ; carpus and palm about equally wide ; carpus 

 nearly four and one-half times as long as its greatest width ; palm 

 shorter, measured on the upper margin, about three and one-half times 



^^Ann. Mag. Hist., ser. 7, vol. 12, p. 546, 1903. Chcramus occidentalis Bate, 

 Rept. Challenger Macrura, p. z^, pi. 2, fig. I, 1888. Callianassa batei de Man, 

 Capita Zoologica, vol. 2, pt. 6, p. 10, pi. i, fig. 3, 1928. 



" Bull. U. S. Fish Comm. for 1900, p. 92, fig. i6a-d, 1901. 



