232 University of California Publications in Zoology [Vol. 23 



are taken in immense numbers in seines, together "with many shoal-water species 

 of fish, yet the supply seems to be undiminished. Three or four good-sized crabs 

 sell in the market at retail for 25 cents. ' ' To-day no crabs could be taken by 

 shore-hauled seines in the locality mentioned, and very few of marketable size 

 by any method in any part of the bay; profitable fishing is confined to the bar 

 three or four miles outside the Golden Gate. One good-sized crab sells for 25 cents 

 in the market on rare occasions, but more commonly for 30 or 35 cents. The 

 supply seemed "to be undiminished" only because of the short time under 

 observation. The history of this fishery, which even under protective legislation 

 has markedly diminished in thirty years, is significant for yet unexploited regions. 



We obtained eight specimens ranging from 39 to 55 mm. in width, 

 in two hauls of the 250-foot seine at Fort Baker ; at Sausalito three 

 small individuals in a 150-foot seine ; and at Tiburon with the same 

 gear a single male, 46 mm. in width. 



Outside, strange to say, not a single specimen was dredged in water 

 exceeding 14 fathoms in depth, although on the fishing grounds, in 

 30 to 40 fathoms, one haul made by the commercial trawlers (July, 

 1912) yielded thirty-five juvenile specimens, ranging from 10 to 18 

 mm. in width (av. 12.5 mm.). Within the bay, except for thirty-seven 

 specimens taken in four hauls (D 5739, 5742, 5808, 5809) in 20 to 

 53 fathoms, the vast majority of the records (63%) were made in 

 less than 10 fathoms, and of these nearly half (47%) did not exceed 

 5 fathoms in depth. 



All told, Cancer magister was taken at fifty-one dredging, one 

 hydrographic, and five shore stations as follows : D 5702, 5705, 5708, 

 5710, 5712-5722, 5725, 5731, 5732, 5734, 5735, 5739, 5741-5743, 5745, 

 5749, 5750, 5752-5754, 5762-5764, 5766, 5776, 5778-5780, 5784, 5795, 

 5796, 5798, 5799, 5801, 5802, 5804, 5806-5809, 5816, 5818, 5819, 5822, 

 5825, 5826, 5828; H 5168; Sausalito, March 23, 1912; "fishing 

 grounds," July, 1912 ; north of Key Route Pier, August 2, 1912 ; Rich- 

 mond shore, north of Standard Oil pier, August 3, 1912 ; Fort Baker, 

 April 19 and May 13, 1913 ; Tiburon, April 29, 1913. 



Cancer gracilis Dana 



Plate 35, figure 2 



Cancer gracilis Dana, Proc. Acad. Nat. Sci. Phila., 6, 73, 1852 ; Crust. U. S. 

 Expl. Exped., 1, 153, 1852, pi. 7, fig. 2, 1855; Holmes, Occas. Papers 

 Calif. Acad. Sci., 7, 52, 1900; Eathbun, H. A. E., 10, 177, 1904; 

 Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 42, pi. 9, figs. 26-28, 

 1910. 

 Characters. — Carapace quite strongly convex, very slightly areolated; antero- 

 lateral teeth low, projecting less than one-third the length of base, not spiny- 

 pointed; front not produced, the three median teeth reach farther forward than 



