520 Stimpson on the Crustacea and Echinodermata 
ALLORCHESTES ANGUSTUS. Dana. 
Allorchestes angustus, DANA ; .Proc. Acad. Nat. Sci. Philad. 1854, vii. 177. 
This species may be recognized by its high épimerals. 
Hab. California, (Le Conte.) 
Mus. of Prof. Dana. 
GAMMARUS 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, Zoàül. i. 137. PI. VI. f. 28. 
Hab. Sitka, (Wosnessenski.) 
Mus, Acad. Petrop. 
GAMMARUS ATCHENSIS. Brandt. 
Gammarus Atchensis, BRANDT; Sibirische Reise, Zodl. i. 138. Pl. VI. f. 29. 
Hab. Atcha and Unalaschka, ( Wosnessenski.) 
Mus. Acad. Petrop. 
GAMMARUS CONFERVICOLUS. Stimpson. 
Mera confervicola, Srimpsox ; Proc. Cal. Acad. Nat. Sci. i. 90. 
Body sorhewhat compressed, smooth except at the ist 
terior three abdominal segments, the dorsal surfaces O 
which are angular and spinulose or setose. Antenne 0^ 
, both pairs slender, about equal in their length, which is 
* half i of the body. Superior ones with thread-like 
22-articulate flagella constituting two-thirds of their length; 
* 
