!9 21 ] Schmitt: The Marine Decapod Crustacea of California 61 



Biological Survey of San Francisco Bay. — Only four specimens of 

 this species were taken in the bay; three in 5 to 7% fathoms, from 

 the "rough, rocky bottom" to the eastward of Point Bonita 

 (D 5770) ; and one also from a hard bottom of "fine clean gray 

 sand, and medium sized rounded stones" in 2y 2 to 3^ fathoms on 

 the bay side of Fort Point (D 5778). 



Spirontocaris decora Rathbun 



Spirontocaris decora Eathbun, Proc. U. S. Nat. Mus., 24, 896, 1902; 

 H. A. E., 10, 79, fig. 33, 1904. 



Fig. 38. Spirontocaris decora, J, lateral view, X 3 (from Eathbun, U. S. 



N. M.). 



Characters. — Sixth abdominal segment longer than the telson, nearly three 

 times as long as wide. Eostrum longer than the carapace, armed above with four 

 or five teeth, of which one or two are on the carapace, anterior tooth in front of 

 middle of rostrum. Eostrum not deep, but less slender than in S. gracilis and 

 S. flexa, a little concave above, but nearly horizontal ; lower limb narrowing distally 

 from near posterior end, armed with six to eight teeth ; tip acuminate. Basal spine 

 of a.ntennules reaching about to end of first segment of the peduncle. Posterior 

 margin of third segment of abdomen is produced backward in the middle, and 

 the segment itself is posteriorly prominent but not laterally pinched or earinated 

 as in allied species. 



Dimensions.- — Type, female: approximate length 47 mm., length of carapace 

 and rostrum 16.4 mm., of rostrum 9 mm. 



Type Locality. — Off Santa Cruz Island, California ("Albatross" station 

 2946). 



Distribution. — From Straits of Fuca to San Diego, California, 50 to 171 

 fathoms (Eathbun). 



