80 Crustacea and Echinodermata of the 



ALLORCHESTES ANGUSTUS. Dana. 

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



This species may be recognized by its high epimerals. 

 Hab. California, (Le Conte.) 

 Mus. of Prof. Dana. 



GAMMAEUS PUGETTENSIS. Dana. 



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

 PL LXVI. f. 1. 



Hab. Puget Sound, (Expl. Exped.) 

 Mus. Expl. Exped. 



gammarus sitchensis. Brandt. 



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



Hab. Sitka, (Wosnessenski.) 

 Mus. Acad. Petrop. 



gammarus atchensis. Brandt. 



Gammarus Atchensis, Bkandt ; Sibirische Reise, ZoOl. i. 138. PI. VI. f. 29. 



Hab. Atcha and Unalaschka, (Wosnessenski.) 

 Mus. Acad. Petrop. 



GAMMARUS CONFERVICOLUS. Stimpson. 



Mara confervicola, SmirsoN ; Proc. Cat. 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 flagella constituting two-thirds of their length ; 



