of the Pacific Shores of North America. 499 
HIPPOLYTE LAYI. Owen. 
Hippolyte Layi, Owen; Zool. of Beecheys Voyage, 90, Pl. XXVII. f. 3. 
BRANDT; Sibirische Reise, Zodl. i. 117. 
In this and the succeeding species the rostrum is much 
longer than in any other herein mentioned, often exceeding 
three fourths that of the thorax. Only two or three of the 
dorsal teeth belong to the thorax proper, and the posterior 
one of these is at about the anterior third of its length. 
Hab. Monterey, (Capt. Beechey.) 
Mus. R.C. 8; Zoöl. Soc. 
HIPPOLYTE SITCHENSIS. Brandt, 
Hippolyte Sitchensis, Brant ; Sibirische Reise, Zool. i. 116, Pl. V. f. 18. 
This differs from H. Layi, in having a smaller number of 
larger and more crowded teeth on the rostrum, but it is 
Probably only a variety. 
Hab. Sitka, (Brandt ;) Monterey, (A. S. Taylor.) 
Mus. Acad. Petrop. : 
HIPPOLYTE PALPATOR. Owen. 
Hippolyte palpator, Owen ; Zodl. of Beechey's Voyage, 89. Pl. XXVII. f. 3- 
E Sibirische Reise, Zool.i. 117. Stumpson; Proc. Cal. Acad. Nat. 
1, 89. 
This Species may be determined by its rather slender 
im, small rostrum, and very long outer maxillipeds. The 
: tín] crest is six-toothed above, the posterior tooth being 
Just in front of the middle of the thorax. The rostrum is 
very slender, about one fourth as long as the thorax, and 
toa sharp, sometimes bifid, extremity. 
+ Monterey, (Capt. Beechey.) 
Mus. R. C. S.; Zoil. Soc. 
