38 CALIFORNIA ACADEMY OF SCIENCES. 



on the postero-lateral margin. Pterygostomian region armed with several 

 spines. Chelipeds in the adult male long; merus Jong, subcylindrical, 

 armed above with numerous spines and usually having a few spines at the 

 distal end of the lower margin; carpus with the outer surface tuberculated; 

 hand large, smooth, elongated and compressed; fingers widely gaping. 

 Ambulatory legs pubescent; merns armed above with numerous spines, 

 and with one or more spines near the distal end of the lower margin; 

 carpus with one or more spines above; propodi long, slender, subcylin- 

 drical, unarmed, and about twice the length of the dactyls. 



Cape St. Lucas, Acapulco, Mexico (St.); Mazatlan, 

 Magdalena Bay! Lower California; San Diego! Santa 

 Catalina Island! San Pedro! San Clemente Island! 



This species differs from parvifrons in having the 

 hand entirely devoid of spines. The chelipeds in the 

 male become greatly elongated with age; the hand 

 becomes narrower, the spines on the lower side of the 

 merus become obsolete, while those on the upper side 

 become blunt. In one specimen from Port Escondido 

 the chelipeds were two and one-half times the length of 

 the carapace; the merus was a little longer than the 

 carapace and the hand about one-third longer. The 

 carapace is covered with a pubescence which disappears 

 to a greater or less extent with age. 



I have seen the two specimens of Fisheria depressa 

 referred to by Lockington as " No. 21" (1. c., p. 73). 



Herbstia parvifrons Randall. 



Herbstia parvifrons RANDALL, Journ. Acad. Nat. Sci. Phila., Vol. VIII, 

 1839, p. 107.' GIBBES, Proc. Am. Ass. Adv. Sci., 1850, p. 170. 

 STIMPSON, Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 451. 



I have not seen this species nor do I believe that any- 

 thing has been found since Randall's specimen was 

 taken which answers to his description, which is quoted 

 below. 



" Corpore depresso, in latere spinoso, pedibus spinosis, leviter dilatatis, 

 manibus hevigatibus, dactylis apice serrulatis." 



