430 PROCEEDINGS OF T7IE NATIONAL MUSEUM. vol.42. 



CERATOCOTTUS DICERAUS (Pallas). 



Mororan and Hakodate markets ; three specimens. 



CERATOCOTTUS NAMIY.E Jordan and Starks. 



A male specimen from the Otaru market about 245 millimeters 

 long (the type of the species measured the same) has 8 dorsal 

 spines. The width of the interorbital space is contained five times 

 in the head measured to end of opercular flap. The occipital ridges 

 converge somewhat behind. There are many small prickles scat- 

 tered along the back above the lateral line, in a region that is per- 

 fectly smooth in the type. The color pattern is like that of the type, 

 except that the markings are everywhere distinct, the clouds, spots, 

 and bars being deep brownish black. Both the Mororan example 

 and the type have long, slender tentacles scattered over the lower 

 half of the body behind the pectorals. 



DSAYCOTTUS SETIGER Bean. 



Otaru market. 



COTTUS POLLUX Gilnther. 



Yamaguchi. 



Many specimens of Coitus irnUux from Tachikawa collected by 

 Jordan and Snyder have 1 sj^ine and but 3 rays in the ventral 

 fin. Others from Utsonomiya have similar ventrals. Specimens 

 taken at Morioka have 4 rays. The examples from Morioka have 

 14 pectoral rays (except one which has 13), those from Tachikawa 

 13, and those from Utsonomiya 13 or 14. No other differences 

 were found, and it is probable that they belong to the same species, 

 the number of ventral rays being variable. Coitus pollux closely 

 resembles the American C. gulosus and C. yunctulatus, each of which 

 occasionally produces individuals with 3 rays in the ventral fin. 



COTTUS NOZAW.S: Snyder. 



Plate 55, fig. 2. 



Cottus nozawx Snyder, Proc. U. S. Nat. Mus., vol. 40, 1912, p. 537. 



Ishikari R. at Sapporo, Hokkaido, Hakodate market. 



Coitus nozawse is distinguished from other Japanese species of the 

 ■genus by the following combination of characters: Three preopercular 

 spines, naked palatines, 4 ventral rays, and a very short maxillary 

 which reaches to anterior border of eye and not beyond anterior 

 border of pupil. 



Coitus pollux has but 1 preopercular spine, the preopercle being 

 smooth below this in specimens examined. The palatines are 

 smooth, the maxillary long, reaching beyond the middle of pupil, 

 or even well beyond the eye in large examples. The caudal peduncle 

 is deeper than in C. nozawae,. C. i^einii, which the writer has not 

 seen, has 3 preopercular spines, thus differing from C. pollux, ,and a 

 very long maxillary, which serves to distinguish it from C. nozawx. 



