500 Stimpson on the Crustacea and Echinodermata 
HIPPOLYTE BREVIROSTRIS. Dana. 
Hippolyte brevirostris, Dana; U. S. Exploring Expedition, Crust. i. 566. Pl. 
XXXVI. f. 5. Srimpson; Proc. Cal. Acad. Nat. Sci. i. 89. 
Some individuals of this species approach so closely to 
H. palpator, that I am half inclined to consider it as a 
variety. Both are characterized by having greatly elongated 
outer maxillipeds, two subocular teeth on the margin of 
the carapax, and large thoracic dorsal teeth, the posterior 
one near the ‘middle of the thorax. H. brevirostris is ap- 
parently a more robust species; the rostrum is generally 
shorter, and has fewer teeth; and the shield of the second 
abdominal segment is much larger than that of H. palpator 
as figured by Owen. The slender flagellum of the internal 
antenne is generally scarcely longer than the stout one. 
Posterior feet moderately spinulose. Basal joints of outer 
maxillipeds with serrated margins. Color, uniform light 
crimson or scarlet. 
Hab. Straits of De Fuca, (Expl. Exped.;) San Francisco 
Bay, (W. S.) 
Mus. Expl. Exped. ; Phil. Acad.; Smithsonian. 
HIPPOLYTE TAYLORI. Stimpson, n. s- 
In this species the rostrum is exceedingly short, consisting 
only of the small terminal tooth of the dorsal crest, and 
projecting scarcely beyond the anterior margin of the thorax. 
This dorsal crest is serrated with six teeth, including the 
terminal one. The posterior tooth is at the middle of the 
thorax; and the second and third (from the front) are ae 
above than behind the first, which is much the smallest 
There is a single sharp spine beneath the eye, but hardly " 
vestige of another beneath this. The feet of the first s 
are very stout; those of the second pair reach the Ups 9 
the maxillipeds. This species is more slender than the 
- 
