

Length of 

 Carapax. 



Width. 



Proportion. 



9 



4.72 inch. 



5.31 inch. 



1:1.13 inch. 



9 



5.58 



6.30 



1:1.13 



i 



10.00 



10.25 



1:103 



38 Crustacea and Echinodermata of the 



tubercles, instead of at the first pair of antero-lateral teeth, 

 (S of Dana.) In these females the characters of the abdo- 

 men usual in female Lithodince are prominently shown, the 

 terminal apex being turned considerably to the right of the 

 median line of the body ; there are no marginal plates on 

 the left side, where the greater mass of the ova are placed, 

 the ovigerous feet being wanting on the right side with the 

 exception of that of the first pair. 



The dimensions of three specimens are as follows : — 



Loc. 

 San Francisco, 



1 (Gibbons) 



All the specimens yet found were taken off the mouth of 

 San Francisco Bay, and near the Farallone Rocks. They 

 have been brought to the market of the city by fishermen, 

 who are encouraged to preserve them when caught, by the 

 high prices (from five to ten dollars) at which they are easily 

 sold. 



Mus. Cal. Acad. ; North Pacific Expedition. 



lithodes spinosissimus. Brandt. 



Lithodes spinosissimus, Brandt ; Bulletin phys.-mathem. de VAcademie de St. 

 Petersbourg, 1849, vii. 173. 



The members of the tribe Lithodea may easily be distin- 

 guished by the apparent want of the fifth pair of feet, which 

 are very small, and always folded up over the back and 

 concealed beneath the carapax. The present species may 

 be recognized by the very numerous long sharp spines with 

 which it is everywhere covered above. 



Hub. Kadjak, (Wosnessenski.) 



Mu?. Acad. Petrop. 



