1921 ] Schmitt: The Murine Decapod Crustacea of California 59 



Dimensions. — Type, female: length 54 mm.; of carapace and rostrum 20 mm.; 

 of rostrum 11.5 mm. 



Type Locality. — North of Bird Island, Shumagins, Alaska, 21 fathoms ("Alba- 

 tross" station 2850). 



Distribution. — From Bering Sea to Drake 's Bay, California, 20 to 93 fathoms 

 (Eathbun). 



Remarks. — This species is very near S. gracilis, from which it differs in the 

 longer basal scale of the antennules, in the lower position of the pterygostomian 

 spine, in the presence of epipods on the maxilliped and first two pairs of feet 

 (Eathbun). 



Spirontocaris gracilis (Stimpson) 



Hippolyte gracilis Stimpson, Proc. Acad. Nat. Sci. Phila., 16, 155, 1864. 

 Heptacarpus tenuissimus Holmes, Oecas. Papers Calif. Acad. Sci., 7, 203, 



1900. 

 Heptacarpus? gracilis Holmes, ibid., 7, 205, 1900. 

 Spirontocaris gracilis Eathbun, H. A. E., 10, 77, fig. 31, 1904. 



Fig. 37. Spirontocaris gracilis, 5, lateral view, X 2 (from Eathbun, U. S. 

 N. M.). 



Characters. — Eostrum very slender, similar to that of S. flexa, scarcely higher 

 than wide ; armed above with four spines, the posterior on the carapace, the 

 anterior near middle of rostrum; armed below with four or five small distant 

 teeth. The spine on the outer side of the base of the antennules does not reach 

 beyond, or only slightly beyond the first segment of the peduncle. Third maxilliped 

 without an epipodite (see Remarks). Abdomen strongly geniculated or bent at 

 a right angle at the third segment, which is posteriorly produced and compressed 

 forming a smooth, rounded carina; sixth segment more than twice but not three 

 times as long as wide, and not longer than the telson. 



Dimensions. — Type: length 31.8 mm. 



Type Locality. — Puget Sound. 



Distribution. — From the Shumagins, Alaska, to Santa Catalina Island, Califor- 

 nia, 21 to 47 fathoms. 



Remarks. — This is, so far as known, the only Spirontocaris from the west 

 coast of America in which the third maxilliped lacks an epipodite. 



Biological Survey of San Francisco Bay. — Spirontocaris gracilis 

 was taken at three outside stations, D 5785, 5786, 5791, which were 



