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. 



O / 



The only male specimen in the collection is 

 smaller than the female, and the surface generally 

 more tuberculated. The right propoclos 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 Itevis ; rostrum quadratum ; oculo- 

 rum alvei altae-fissurse ex utra parter ostri ; svmt pleou ex Lvva 

 propodis par primus subcequalia et lama cum carinu supra 

 dactylos. 



