78 Crustacea and Echinodermata of the 



second pair, which is also destitute of tooth-like lobes ; in 

 the tooth on the inferior margin of the third article in the 

 first pair of feet ; and in its shorter and stouter antennae. 

 From the latter, it differs in having oblong instead of trans- 

 verse joints in the flagella of the inferior antennae ; the 

 flagella being also longer than their peduncles, which are 

 not scabrous ; there is also no two-jointed process on the 

 third joint in the second pair of feet. 



O. Traskiana is exceedingly abundant in the vicinity of 

 San Francisco, living among the rejectamenta along high- 

 water mark. Were it not that I have had opportunity of 

 comparing it with the original specimens kindly lent me 

 by Prof. Dana, I should scarcely have believed that it was 

 not identical with one of the numerous species already 

 described from this coast. 



ALLORCHESTES PUGETTENSIS. Dana. 



Allorchestes Pugettensis, Dana ; U. S. Exploring Expedition, Crust, ii. 901. 

 PI. LXI. f. 6. 



Hub. Puget Sound, (Expl. Exped.) 

 Mus. Expl. Exped. 



ALLORCHESTES SEMINUDA. Stimpson. 

 Allorchestes scmimula, Stimpson ; Proc. Cal. Acad. Nat. Sci. i. 90. 



Body somewhat compressed ; eye oval ; superior an- 

 tennae three fifths as long as the inferior ones, with flagella 

 consisting of thirteen sub-oblong joints ; inferior antennae 

 two-fifths as long as the body, with 14-articulate flagella. 

 On both pairs of antennae there are a few short setae at the 

 extremity of each joint. Hand in the first pair of feet 

 small, palm oblique, almost transverse ; finger of moderate 

 size ; carpus produced at its inferior angle into a sharp pro- 

 jection. Hand in the second pair rather large, oblong- 



