University of California Publications in Zoology [Vol. 23 



Crago alaskensis elongata (Rathbun) 



Crangon alaskensis elongata Eathbun, Proc. U. S. Nat. Mus., 24, 888, 1902; 

 H. A. E., 10, 115, fig. 54, 1904. 



Fig. 58. Crago alaskensis elongata, J; a, acicle, X 2; o, anterior portion of 

 carapace, X 2% (from Eathbun, U. S. N. M.). 



Characters. — Antennal scale as long as the carapace, exclusive of the rostrum ; 

 antero-internal angle of blade rounded and not produced ; spine extending consider- 

 ably beyond the blade. Hands from two and a half to three times as long as 

 wide; anterior margin, against which dactylus closes obliquely forming an angle 

 of about 45° with the lengthwise margin. Fifth segment of abdomen with superior 

 median carina. 



Dimensions. — Type, ovigerous female : length from tip of rostrum to tip of 

 telson 55.7 mm., length of carapace, 13.5 mm., of antennal scale 11.6 mm. The 

 San Francisco Bay material ranged in length, from tip of rostrum to end of telson, 

 for the smallest specimen, a male, 11 mm., to 55 mm. for the largest, an ovigerous 

 female; the greater number of the specimens averaged about 44 mm. in length. 



Type Locality. — Off Santa Barbara, California, 29 fathoms ("Albatross" 

 stations 2970, 2971). 



Distribution. — British Columbia to United States Mexican boundary line. 



Reviarks. — This subspecies is a form of C. alaskensis, which is found from 

 Puget Sound northward. It differs from the typical C. alaskensis in that the 

 rostrum is longer and narrower ; the outer flagellum of the antennules falls con- 

 siderably short of the antennal scale; the antennal scale is much longer, about 

 equaling the length of the carapace exclusive of the rostrum. 



Biological Survey of San Francisco Bay. — Crago alaskensis elon- 

 gata was taken in numbers of twenty or more at all outside stations at 

 which the depth exceeded 19 fathoms, D 5785-5792 except D 5788, 

 60 to 68 fathoms, where only two specimens were obtained. Pandalus 

 jordani was taken at all but the most shoal of these stations, D 5792. 

 19 to 26 fathoms, the others being all over 29 fathoms in depth. The 

 bottom uniformly was very fine green sand except at D 5791, where 

 little else than refuse and garbage was brought up. For these stations 

 the observed temperature and salinity ranges are respectively 9.3° to 

 12.2° C, and 33.8 to 34.3. 



