192 J^otes on JVorth American Crustacea. 



The specimen above described is a female, in which the length of the 

 carapax is 0.36 ; the breadth, 0.2Y inch. 



With tlie above there are certain male specimens which may 

 belong to a different species, being smaller and narrower, with 

 the horns of the rostrum acutely pointed, and the external an- 

 tennae narrower, with the external angle of the first moveable 

 joint considerably produced. The chelipeds are large, much 

 compressed, and crested ; carpus with two slight crests confluent 

 posteriorly in a projecting angle or point ; hand rather broad, 

 flat, tapering to the slender fingers, which are not gaping. 

 Dactyli of the ambulatory feet much shorter than in the female. 

 It is diflicult to ascertain the color ; it is apparently pale orange ; 

 but there is a distinct red patch on the dactyli of the ambula- 

 tory feet at the middle. 



The specimens were all collected at Cape St. Lucas by Mr. 

 Xantus. 



Othonia sexdentata. 



Othonia sexdentata Bell, Trans. Zool. Soc, ii. 56, pi. xii., f. 1. 



This species has been hitherto known only from the Galla- 

 pagos Islands. Our specimens were collected at Cape St. 

 Lucas by Mr. Xantus. They agree in all respects with Bell's 

 description and figure. 0. sexdentata is the analogue of 0. 

 OjCuleata of the east coast, from which it difiers in the numerous 

 granules on the posterior part of the carapax, etc. 



Inaclioides laevis, nov. sp. 



Carapax mostly smooth, and covered with a soft pubescence easily 

 removed. Gastric and branchial regions protuberant, rounded, glabrous ; 

 cardiac with a single median tubercle. Rostrum rather long, with a 

 styliform extremity as long as the thicker, tapering, basal half. Post- 

 ocular spine very small, blunt. Hepatic region conical, armed at the 



