NO. 6 DECAPOD AND OTHER CRUSTACEA SCHMITT 13 



Nearly all of our specimens have four dorsal rostral teeth, of which 

 two, usually, were on the carapace and two on the rostrum proper ; 

 one specimen had five teeth above ; and one with an unusually short 

 and certainly abnormal rostrum had only three teeth above ; below 

 there is mostly but a single tooth, sometimes two. 



Outer antennular flagellum has 7-1 1 (usually 8-9) free joints and 

 5-7 fused, the free portion is longer than the fused, except in very 

 young and small specimens. 



The multiarticulate carpus of the second pair of legs may have 

 from 20-25 articulations. 



As compared with L. galapagensis Schmitt, L. paucidcns has fewer 

 dorsal rostral teeth, and a relatively longer rostrum which is nor- 

 mally longer than the eyes by that portion which lies anterior to the 

 ventral tooth and which reaches about or even beyond the middle of 

 the second joint of the antennular peduncle. The first pair of legs, 

 the chelipeds, are relatively more slender, the second pair noticeably 

 longer ; and there are consistently more joints to the free portion of 

 the outer antennular flagellum. The ambulatory legs and the body 

 habitus of the two species are very much alike. 



Brachycarpus biunguiculatus (Lucas) ij 



Kemp (Rec. Indian Mus., vol. 27, pt. 4, p. 312, 1925) has dis- 

 cussed this species and given rather full synonymy. He very prob- 

 ably correctly regards Nobili's B. advena from the Red Sea (Ann. 

 Sci. Nat., Zool. (9), vol. 4, p. 75, pi. 4, fig. 1, 1906) as a synonym of 

 B. biunguiculatus. 



It was somewhat of a surprise to find a single small female of B. 

 biunguiculatus about 20.3 mm. in length among the Crustacea col- 

 lected at Clipperton. In fact, it was not until a drawing of the telson 

 was completed that it was suspected that we were dealing with a 

 Brachycarpus at all. In most, if not all, particulars our specimen 

 seems to fit the characterization of the species as set forth by Kemp, 

 except in the number of segments in the fused basal portion of the 

 outer antennular flagellum, which appears to have but seven seg- 

 ments. Kemp gives a range of from 15 to 23 segments in specimens 

 which he examined, which included some from the West Indies. I 

 examined our West Indian and Bermuda specimens and found that 

 the larger specimens, both male and female, from Bermuda, Puerto 

 Rico, and Barbados, upward of 40 mm. in length, had 15 to 21 seg- 

 ments in the fused basal portion of the outer flagellum, and about 

 the same number in the thicker, free portion. On the other hand, the 

 small specimens, mostly from 25 to 27 mm. in length (one 39 mm.), 



