1921] Schrmtt: The Marine Decapod Crustacea of California 223 



In the lower bay: six medium sized individuals were obtained in 

 mid-channel off Mission Rock (D 5723) on a bottom of "black sticky 

 mud streaked with brown," covered "with many shells, clinkers, and 

 abundant ophiurians. " Another specimen was taken at an adjacent 

 station (D 5802) on a "sandy, shelly, mud" bottom; while still an- 

 other was dredged on the edge of the "muddy sand" flats off Alameda 

 (D5767). 



The highest temperature at which any particular specimen was 

 taken, was 17.0° C, off Alameda (D 5767), the lowest, 11.0° C, east of 

 Fort Point (D 5779) ; the greatest salinity was 33.3, off Sausalito 

 (D 5801), the least 21.7, off Point San Quentin (D 5708). 



One half of all the dredging records were in less than 9 fathoms ; 

 of the remainder only two exceeded 19 fathoms, the deeper of which 

 was made in Golden Gate (D 5808) in 27 to 43 fathoms, at a time 

 when the observed bottom temperature and salinity were 11.1° to 

 13.4° C and 32.3 to 32.4 respectively. Two specimens were seined at 

 Sausalito in March, 1912. 



A complete list of dredging stations at which this species was taken 

 includes: D 5700, 5702, 5708, 5718, 5723, 5754, 5763, 5767, 5773, 5778, 

 5779, 5795, 5801, 5802, 5808, 5826. 



Cancer amphioetus Rathbun 



Plate 36, figures 1 and 2 



Trichocarcinus dentatus Miers, Proc. Zool. Soe. London, 7, 34, 1879. 

 Cancer amphioetus Eathbun, Proc. U. S. Nat. Mus., 21, 582, 1898; H. A. 

 E., 10, 175, pi. 6, fig. 3, 1904. 



Characters.- — Carapace smooth, not pubescent, but strongly areolated; antero- 

 lateral margins with nine flat, broadly triangular, not strongly produced, subequal 

 teeth; behind the ninth tooth is usually a small tooth on the posterolateral margin, 

 ■which is defined by a line of granules; fronto-orbital width nearly one-half the 

 width of the carapace; front five-toothed, the middle one very small, the two 

 outer separated from the rest by a wide interval. Carpus with two spines, one 

 above, at distal end, and a second below this, on inner angle ; hand of cheliped with 

 usually two spines on its upper margin and three longitudinal raised ridges on 

 its outer surface; dark color on the fingers of the chelipeds reaching more than 

 one-half the length of the outer margin, movable finger not more than two-thirds 

 colored. 



Dimensions. — Type, male: length 22.2 mm., width 25.4 mm.; female: length 

 27.5 mm., width 38.1 mm. 



Type Locality. — Off the Korean coast. 



Distribution. — From San Diego Bay, California, to the Gulf of California; 

 Japan; Korea, 11% and 169 fathoms (Rathbun). 



