PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM, 421 
are broad at base, and narrowed to triangular tips. The eyes themselves 
are very small, black, and situated on the outer and inferior edge of the 
eye-stalks. | 
The ¢helipeds are nearly as long as the carapax, and similar in form 
to those of L. tridentatus. The propodus is short and very mueh 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 compressed and very 
thin, with the outer edge regularly curved and sharp; the prehensile 
edge is sharp and slightly irregular in outline, but not dentate, although 
the opposing edge of the propodus is armed with about five 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 
nearly 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 with 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 punctations 
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, rowitich the above description is drawn, gives 
the following measurements : 
mmm. 
CoP umoimatipax, INChudine TOStTUM .--— = - coc. wmemns aoe cnn cecaee steewe ~~~ 0 - = 38. 4 
Breadthof carapax just back of lateral spines -.---:-....... 02... .----- o----- 22. 0 
Breadth of carapax between tips of lateral spines........-.-....--------- ------ 22.5 
Breadth of front between tips of lateral spines -.......-..-.--..--------------- 6.8 
LRG OL ROSEN ee ee ee SS eee a eee eT 4.0 
Ea RGEC lao s\ nos «sos = sae eae ieee Seema seleeme sman ga0s <= 5 ssn. 20. 0 
