of the Pacific Shores of North America. 513 



being crowded, project in different directions, nearly con- 

 cealing the posterior half of the animal. Each is about 

 one fifth as broad as long, compressed on the inner and 

 thickened along the outer or convex edge. 



Only females of this species have as yet been found. 

 The dimensions of one Specimen are, 



Length of body, 0.58 inch. 



" abdomen, . . . . . 0.12 " 



" " superiorabdominal appendages, . 0.24 " 



Breadth of thorax, 0.45 " 



Several examples of this singular crustacean have been 

 found on Gebice from Puget Sound and Tomales Bay. 



AMPHIPODA. 



CAPRELLA CALIFORNICA. Stimpson. 

 Caprella Californica, Stimpson ; Proc. Cal. Acad. Nat. Sci. i. 89. 



The body in this species is slender. The antennae are 

 exceedingly variable in their proportions ; the nagella of 

 the superior ones 10-15 articulate; inferior ones subpedi- 

 form. A more or less developed spine, which curves 

 forward, and is sometimes of considerable length, is placed 

 upon the dorsal surface at the anterior extremity of the 

 first thoracic segment. Hand of the second pair of feet 

 generally three-toothed on the inner surface ; teeth (in full 

 grown specimens) about equal in size, and placed mostly 

 toward the outer extremity of the palm. Two or three 

 sharp tubercles along each of the sides of the branchiferous 

 segments ; and a short dorsal spine on each of the three 

 posterior segments. Hands of posterior feet slender. Color, 

 variable. Length, one inch ; breadth, about 0.03 inch. 



JOURNAL B. S. N. H. 66 



