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, à ; $ $ " 0.58 inch. 
“ abdomen, x j : ‘ i 
"  '" sguperiorabdominal appendages, . 0.24 “ 
Breadth of thorax, . . í : ; C XP T 
Several examples of this singular crustacean have been 
found on Gebie 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 antenne are 
*xeeedingly variable in their proportions; the flagella 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 
Pg the dorsal surface at the anterior extremity of the 
t thoracic segment. Hand of the second pair of feet 
Senerally three-toothed on the inner surface; teeth (in full 
vovh 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 
n segments. Hands of posterior feet slender. Color, 
Variable, Length, one inch; breadth, about 0.09 inch. 
JOURNAL B. s, N, H. 66 
