272 SPECIFIC DESCRIPTION. 
corresponding with that of the anterior margin, 
traverses a line that is nearly direct from side 
to side, slightly posterior to the points of the 
broadest diameter in the carapace. The pleon 
is triangular, and smaller and narrower than 
in the female, having the lateral margins more 
straight and symmetrical. 
The only male specimen in the collection is 
smaller than the female, and the surface generally 
more tuberculated. The right propodos of 
the first pair of pereiopoda is larger than 
the left, and is so well developed as scarcely 
to be capable of being folded within the 
limits of the carapace. The length of the male 
animal, from the extremity of the rostrum to 
the centre of the posterior margin of the 
carapace, is about three-fourths of an inch; its 
breadth, from the point of one lateral extremity 
to the other, is about one inch and a quarter. 
The size of the largest female in the collection is 
in length about one inch and a quarter, and 
breadth about two inches. 
CRYPTOLITHODES ALTA-FISSURA, N. S.— Foemina 
Carapax est dorsaliter levis; rostrum quadratum; oculo- 
rum alvei alta-fissure ex utra parter ostri; sunt pleon ex leva 
propodis par primus subaqualia et levia cum carina supra 
dactylos. 
