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, 2114, 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, 
7, 5729-57338, 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, 51388, 5148, 5144, 5146, 5158, 5161, 5163-5165, 5168, 5169, 5172, 
5186, 5187, 51938, 5196, 5199, 5250-5252, 5272, 5274, 5276, 5298, 5299, 
5308, 5308, 5311, 5319, 5320; ‘‘fishing grounds,’’ July, 1912; W. of 
Blunt Point, Angel Island, March 27, 1913; Fort Baker, April 19, 
May 138, 1918; Tiburon, April 29, 1913.: 
Crago nigromaculata (Lockington) 
Crangon nigromaculata Lockington, Proce. Calif. Acad. Sci., 7, 34, 1877; 
Holmes, Oceas. Papers Calif. Acad. Sci., 7, 173, pl. 2, fig. 32, 1900; 
Rathbun, H. A. E., 10, 114, fig. 51, 1904. 
a b 
Fig. 57. Crago nigromaculata; a, chela, 2, X 234 (after Rathbun, U. 8. 
N. M.); b, acicle (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 
