50 Crustacea and Echinodermata of the 



arises a small but prominent blunt tooth, which curves 

 upward. Movable finger half as long as the hand, with 

 hooked extremity ; inferior edge swelling out near the base, 

 and minutely denticulated. Both fingers hirsute with scat- 

 tered tufts of hair. Color of the body a delicate orange ; 

 anterior feet rose-colored. Length, three inches. The pro- 

 portional dimensions as compared with the other species, 

 will be given in the table under C. longimana. In this 

 species, I have seen only one case in which the left hand is 

 the larger. 



Hab. San Francisco Bay, near its mouth, (Trask;) Fort 

 Steilacoom, Puget Sound, (Suckley.) 



Mas. Smithsonian ; Cal. Acad. 



CALLIANASSA LONGIMANA. SUmpSOU. 



Plate XXI. f. 5. 



Callianassa longimana, Stimtson; Proc. Bost. Soc. Nat. Hist. vi. 86. 



A slender species, closely allied to the preceding, from 

 which it may be distinguished by the following characters : 

 It is more slender and elongated, and grows to a larger size, 

 being often four inches in length. The outer maxillipeds 

 are less broad. The larger foot of the anterior pair, (see 

 figure,) which is most frequently on the left side, is more 

 slender and less hairy than in the preceding species, with 

 the hand much longer and of equal breadth with the 

 carpus. In our species the carpus is shorter than the body 

 of the hand, while in C. Calif o mi ensis it is longer. In the 

 smaller chelopod, the fingers are of equal length in our 

 species, while in C. Californiensis the finger exceeds the 

 thumb in length. With C. gig-as our species would never 

 be confounded on account of the great difference in the 

 length of the hand. The three species resemble each other 

 very much, however, in general appearance and characters 

 other than those derived from the ehelopoda. The follow- 

 ing table will show their relative proportions : — 



