86 University of California Publications in Zoology [Vol. 23 



23 to 60 fathoms), not a single individual was taken at any station 

 outside at which the depth exceeded 26 fathoms. This is, however, 

 quite in keeping with the Distribution, under which the maximum 

 depth for this species is 31 fathoms, recorded in 1897 by the "Alba- 

 tross" on the Flattery Bank. It is highly probable that the specimens 

 from the deeper bay stations listed above were obtained at or near 

 the shallower end of each of the hauls, for which the minimum depths 

 are 27, 21^, and 23 fathoms, respectively. 



In view of its wide distribution within and outside the bay prac- 

 tically all of the temperature and salinity readings observed during 

 the survey (Sumner, 1914) are applicable to this species. 



A complete list of stations at which Crago nigricauda was taken 

 is given below : D 5700, 5702, 5705, 5707-5709, 5711-5717, 5719-5723, 

 5727, 5729-5733, 5735-5739, 5742-5751, 5754, 5755, 5757, 5758, 5762- 

 5768, 5770-5774, 5776-5784, 5792-5809, 5815-5830, 5833, 5847-5849; 

 H 4987, 4989, 4994-4996, 4998, 5004, 5013, 5014, 5082-5084, 5091, 

 5092, 5094, 5098, 5101, 5103-5107, 5109-5118, 5120, 5122, 5124, 5125, 

 5127, 5138, 5143, 5144, 5146, 5158, 5161, 5163-5165, 5168, 5169, 5172, 

 5186, 5187, 5193, 5196, 5199, 5250-5252, 5272, 5274, 5276, 5298, 5299, 

 5303, 5308, 5311, 5319, 5320; "fishing grounds," July, 1912; W. of 

 Blunt Point, Angel Island, March 27, 1913; Fort Baker, April 19, 

 May 13, 1913 ; Tiburon, April 29, 1913. 



Crago nigromaculata (Lockington) 



Crangon nigromaculata Lockington, Proc. Calif. Acad. Sci., 7, 34, 1877; 

 Holmes, Occas. Papers Calif. Acad. Sci., 7, 173, pi. 2, fig. 32, 1900; 

 Eathbun, H. A. E., 10, 114, fig. 51, 1904. 



Fig. 57. Crago nigromaculata; a, chela, 5, X 2% (after Eathbun, U. S. 

 N. M.); o, aeicle (after Holmes). 



Characters. — Sixth segment of abdomen with a large circular spot on either 

 side of its posterior end; bluish in life and when fresh. Hands similar to but 

 a little longer than those of C. nigricauda. Antennal scale also like that of 



