44 CALIFORNIA ACADEMY OF SCIENCES. 



of this species from the Pacific Coast, and know of none 

 having been found there since Randall's specimen was 

 taken. Mr. Streets, whose words imply that he has seen 

 Randall's type, says that this species "is undoubtedly 

 nothing more than the young of canaliculata. That it is 

 so will be evident to anyone who will take the trouble to 

 compare them closely. It agrees with L. canaliculata in 

 every respect excepting size." 



Legion PARTHENOPINEA. 



" Basal antennal joint very small and imbedded with the next joint in 

 the narrow hiatus between the front and the inner suborbital angle; the 

 infra-ocular space being mainly occupied by the lower wall of the orbit." 



Family PARTHENOPID^E. 



Characters of the legion of which it is the only family. The species of 

 this family are often markedly triangular in form; the carapace is usually 

 angular and provided with conspicuous depressions separating the regions. 

 In the characters of the antennae and also in several other points, the 

 Parthenopidas approach the Cancroid Brachyura. 



Genus Heterocrypta St. 



Carapace triangular, transverse, the lateral margins greatly produced 

 and concealing the ambulatory legs. A conspicuous depression separating 

 the gastric from the cardiac and branchial regions. Rostrum simple. A 

 strongly marked ridge on the pterygostomian regions. Chelipeds greatly 

 developed, trigonal. Posterior margin of the carapace not produced, as 

 in Cryptopodia. 



Heterocrypta occidentalis (Dana). 



Cryptopodia occidentalis DANA, Am. Journ. Sci. (2), Vol. XVIII, 1854, p. 

 430, fig. in text. STIMPSOX, Journ. Bost. Soc. Nat. Hist., Vol. VI, 

 1857, p. 458. GIBBES, Proc. Elliott Soc. Nat. Hist., Charleston, S.C., 

 Vol. I, 1859, p. 36. A. MILNE-EDWARDS, Miss. Sci. au Mex., Vol. I, 

 Pt. V, p. 169. 



Lambrus frons-acutis LOCKIXGTOX, Proc. Cal. Acad. Sci., Vol. VII, 1877, 

 p. 31. 



