520 Stimpson on the Crustacea and Echinodermata 



ALLORCHESTES ANGUSTUS. Dana. 

 Allorchestes angustus, Dana; .Proc. Acad. Nat. Sci. Pliilad. 1854, vii. 177. 



This species may be recognized by its high epimerals. 

 Hob. California, (Le Conte.) 

 Mus. of Prof. Dana. 



GAMMARUS PUGETTENSIS. Dana. 



Gamraarus Pugettensis, Dana ; U. S. Exploring Expedition, Crust, ii. 957. 



PL LXVI. f. 1. 



Hob. Puget Sound, (Expl. Exped.) 

 Mus. Expl. Exped. 



GAMMARUS SITCHENSIS. Brandt. 

 Gammarus Sitchensis, Brandt ; Sibirische Reise, ZoOl. i. 137. PI. VI. f. 28. 



Hob. Sitka, (Wosnessenski.) 

 Mus. Acad. Petrop. 



GAMMARUS ATCHENSIS. Brandt. 

 Gammarus Atchensis, Brandt \ Sibirische Reise, ZoOl. i. 138. PI. VI. f. 29. 



Hab. Atcha and Unalaschka, (Wosnessenski.) 

 Mus. Acad. Petrop. 



GAMMARUS CONFER VICOLUS. Stimpson. 

 Maera confervicola, Stimpson ; Proc. Cal. Acad. Nat. Sci. i. 90. 



Body somewhat compressed, smooth, except at the pos- 

 terior three abdominal segments, the dorsal surfaces of 

 which are angular and spinulose or setose. Antennae of 

 both pairs slender, about equal in their length, which is 

 half that of the body. Superior ones with thread-like 

 22-articulate nagella constituting two-thirds of their length ; 



