WEST AMERICAN CRUSTACEA. t^Sl 



chelipeds, and in the position of the ocellus which is not 

 entirely separated from the cornea as described and fig- 

 ured by Spence Bate (Challenger Reports xxiv, p. 782, 

 pi. cxxviii), nor situated in the cornea as in P. sqiii/la, 

 but is between the two. 



Family PENEID.E. 



Pen^us canaliculatus Olivier. 



P. canaliculafAis Olivier, Eucycl. Method, viii, ]). 6(30. P. cunalku- 

 latus M. Edwards, Hist. Nat. Crust, ii, p. 414. P. canalicHlafus 

 Spence Bate, Challenger Eeports xxiv, p. 242. 



The three specimens we have of Penaeus, one from south- 

 ern California and two from San Francisco Bay, we 

 refer without much doubt to the above species which is 

 fully described and figured by Spence Bate in the Chal- 

 lenger Reports. It is probable that the species from the 

 west coast of Nicaragua, described by Kingsley as P. 

 hrevi7-ostris (Proc. Phil. Ac. Sci. 1878, p. 98) and subse- 

 quently referred by him to P. Braziliensis (1. c. 1879), 

 should have been referred to P. canaliculatus, as the spec- 

 imens we have agree very well with Kingsley's descrip- 

 tion. The two species are very closely allied and it is 

 probable that they are mere geographical varieties. The 

 specimens of P. Braziliensis we have seen have longer 

 and more slender legs than our specimens, but the other 

 differences are slight. P. canaliculatus was described 

 from Japan and Australia, and varies considerably in the 

 different locahties in which it is found. P. Braziliensis 

 is likewise very extensively distributed over both shores 

 of the Atlantic Ocean. 



