l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Callianassa, one of which regrettably lacks the larger chelipeds, for 

 both represent an exceedingly rare species known heretofore only from 

 the type lot of four described in 1870 by A. Milne-Edwards, from 

 Martinique. 



A comparison with the detailed description given by de Man for one 

 of the specimens of the type lot reveals certain small differences, 

 mention of which might not be out of place here. 



The rostrum is longer, extending about as far forward as the tuber- 

 cles tipping the eyestalks ; the acuminate, lateral spines of the front 

 reach about as far forward as the corneae and so are longer, too, than 

 those of the type. 



I should say that the eyestalks are subcylindrical, though they appear 

 in dorsal view to be more or less cylindrical ; the corneae are rounded, 

 bulged-up prominences on the anterior dorsal surface of the trans- 

 versely convex stalks ; the patches of dark pigment are concentrated 

 within in the median, posterior halves of the corneae. 



The first and third segment of the antennular peduncle are about 

 subequal, each a little longer than the second segment. The terminal 

 segment of the antennal peduncle exceeds the corresponding segment 

 of the antennular peduncle by about three-fourths its length ; the fourth 

 or penultimate segment reaches about two-thirds the length of the 

 second segment of the antennular peduncle; while the distal dorsal 

 margin of the third, which is about all that is visible of it from above, 

 about attains the distal margin of the basal segment of the antennular 

 peduncle. 



The telson is rather angulated. posterior margin rather straight with 

 the triangular median prominence well marked ; medially, in the an- 

 terior half above, there is a small, smooth and shining, more or less 

 semicircular raised area from which the telson falls away to its mar- 

 gins ; two obscure ridges run back to the postero-lateral angles of the 

 telson ; on the posterior margin just inside either of these angles is a 

 tuft of long hair; the hinder margin of the raised area on the dorsum 

 of the telson is also furnished with a pair of these hair tufts. 



The larger cheliped, as in the type described by de Man. is also on 

 the left side ; of the ventral ischial spines, the last is the larger, and so 

 it seems to be also in the drawing that de Man gives of this joint; on 



the lower border of the merus there are but three instead of four 



* 



spines, the first the smallest, the third larger and more forwardly 

 directed than the others ; these three, moreover, are all placed close 



