PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 421 



;bre broad at base, and narrowed to triangular tips. The eyes tliemselves 

 are very small, black, and situated on the outer and interior edge of the 

 eye-stalks. 



The clielipeds are nearly as long as the carapax, and similar in form 

 to those of L. tridcntaUis. The propodus is short and very much com- 

 pressed ; the distal margin is transverse and nearly as long as the length 

 of the whole segment ; the dorsal edge is thin and sharp, and terminates 

 in a sharp tooth near the articulation of the dactylus ', back of the thin 

 digital process the inferior edge is armed with three or four acute teeth, 

 decreasing in size proximally. The dactylus is comi)ressed and very 

 thin, with the outer edge regularly curved and sharp ; the prehensile 

 edge is sharj) and slightly irregular in outline, but not dentate, although 

 the opposing edge of the propodus is armed witli about iive low teeth 

 inside the lip. The first, second, and fourth pairs of ambulatory legs 

 are very nearly' as in L. tridentatus, as figured by De Haan. In the 

 third pair, however, the propodus is nearly twice as broad as long, the 

 inferior edge being expanded into a very thin, broad, lamellar process 

 nearly as large as the body of the segment, and with a ciliated and reg- 

 ularly curved margin nearly semicircular in outline. The dactylus is 

 nearlj" as broad as the propodus, lamellar throughout, articulated at the 

 upper end of the proximal margin, which, below the articulation, is con- 

 cave in outline and ciliated to match the adjoining lamellar process of 

 the propodus; the lateral margins are naked and convex in outline, ex- 

 cept near the tip, which is sharply acuminate. 



The abdomen is slightly more than two-thirds as long as the carapax, 

 and agrees very closely Mith De Haan's figure of the abdomen of the 

 male of L. tridentatus in the form and proportions of the somites. In 

 its natural position, the abdomen is bent at the fourth somite, and this 

 somite is armed with a small spiniform tubercle, projecting from the 

 middle of the dorsal surface. 



The dorsal surface of the carapax and of the abdomen, the stermum, 

 and the exposed surface of the external maxillipeds and of the chelipeds 

 and ambulatory legs are naked, smooth, and highly polished, though 

 the dorsal surface of the carapax is minutely punctate, the puuctations 

 being more numerous on the anterior portions. The subhepatic and the 

 adjacent anterior pleural regions are slightly hairy or pubescent. 



Professor Verrill tells me that the color of the entire animal shortly 

 after it was placed in alcohol, and before the color could have changed 

 materially from that in life, was light orange-red. 



The single specimen, from which the above description is drawn, gives 

 the following measurements : 



mm. 



Length of carapax, iuchidiiig rostrum 38. 4 



Ereadth of carapax just back of lateral spines 22. 



Breadth of carapax between tijis of lateral spines 22. 5 



Breadth of front between tips of lateral spines 6. 8 



Length of rostrum 4. 



Length of abdomen 25. 



