CRUSTACEA. 



CALLIANASSA, Leach. 

 C. Stimpsonii, n. s. 



PI. 9, Fig. 1, a, b, c. 



Hand subquadrate, flattened, equally convex on both sides, 

 slightly twisted. Upper and lower edges acute ; the lower one 

 crenulate. Fixed finger (from cast) nearly as long as the hand, 

 not toothed, very slightly curved on its inner edge. Movable 

 finger unknown. Surface irregularly and minutely wrinkled, 

 and marked along the upper edge by a row of about seven fora- 

 mina, surrounded by a raised lip looking forwards, and over the 

 rest of the surface by a number of pustules, which are largest 

 and most closely placed on the upper half. 



The figures are of natural size. Fig. b represents a hand from Chico Creek, col- 

 lected by Mr. Esmond. Fig. c, another hand, found by myself at Clayton, Contra 

 Costa County, in the sandstone above the coal. Fig. «, three segments of the 

 abdomen, very imperfect, found in the same mass as the preceding specimen. 

 Also found near Canada de las TJvas. From both divisions of the California Cre- 

 taceous. 



Compared with C. Danai, H. and M., from Nebraska, the hand of this species 

 is proportionally shorter, broader, and apparently less robust. There are two 

 species found in New Jersey, and as far south, in the Cretaceous, as Mississippi ; 

 but, as well as I can remember, the hands are in both cases narrower than in the 

 present one. I placed specimens of both the above in the hands of my friend, 

 Dr. Stimpson, for description ; and take pleasure in dedicating the present species 

 to him. 



PAL. VOL. I. — 8 ( 57 ) 



