494 Stimpson on the Crustacea and Echinodermata 
This species was found abundantly near Astoria by 
Lieut. Trowbridge. It occurs sometimes in brackish water, 
as I am informed by Dr. Cooper. 
Mus. Bost. Soc.; Smithsonian; Paris; Acad. Petrop. 
ASTACUS KLAMATHENSIS. Stimpson. 
Astacus Klamathensis, Srrmpson; Proc. Bost. Soc. Nat. Hist. vi. 87. 
A small species with a smooth carapax; thorax some- 
what contracted in front. Thoracic spines of the anterior 
pair very small; those of the posterior pair obsolete. Ros- 
trum small; margins smooth, converging; antero-lateral 
teeth sufficiently distinct; terminal tooth short. Dors 
area broad. Anterior feet with rather small, smoothish 
hands; inferior edge of arm less strongly dentated than in 
the other species. Sides of the abdominal segments broadly 
rounded, scarcely at all angular at the middle. The minute 
lateral spines of the caudal segment are rather short and 
stout. Color, in preserved specimens, yellowish-white, clear 
and bright ; hand slightly tinted with olive or bluish. The 
dimensions of a female specimen are as follows :— 
bene OF GNE . 2. . à er m T OHNE INANE 
«Uc ME Pe Ct REY Sen US, PM 
s rostrum i 4 i i ^ : i 294 S 
3 terminal tooth of rostrum . > + > Iara 
and . : Í i : . : 4 30 q 
Breadth of * , ; : : i : : apt 
It may be distinguished from the preceding species by 
its lighter color, shorter and somewhat tapering rostrum, 
less developed spines, and smaller hands. It was found in 
Klamath Lake by Dr. Newberry. 
Mus. Smithsonian 
