268 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVII. 



alleged ditference is that the former is said to have D. VIII-17 (VIII- 

 18, in figure), instead of IX-19, and that the ventrals reach to within 

 an eye diameter of the vent. All these variations are represented 

 among our specimens. Our very man}^ specimens are from the Tana 

 River at Tachikawa near Tokyo, from the Semida River at Tok3'o, 

 from the Kitakami River near Morioka, from the Kinu River at Utso- 

 nomiya, from Niigata in Echigo, from the river at Aomori, and from 

 Kamashiro. 



{pollux., a twin.) 



The following are the fin formulae and localities of our specimens: 



16. URANIDEA DeKay. 



LVcmiffef DeKay, New York Fauna, P^ishes, 1842, p. (51 ((j>iiesreiis=gr((rili><). 



This genus is very close to Oottus, from which it diflers in the 

 reduction of its ventrals to a concealed spine and 3 soft rays. The 

 skin is smooth or very nearly so, the preopercular spine small, and 

 there are usually no teeth on the palatines. Brook fishes, smaller in 

 size than most of the species of Oottus^ and with fewer ventral rays; 

 the genus very doubtfully distinct. We refer to this genus, with 

 some doubt, two Japanese species not represented in our collections. 



(ovpavog, sk}^; eiSov^ I looked, i. e., stargazer.) 



a Head 3J in length; D. IX-17 to 20 relni, 18. 



aa Head 2i in length; D. IX-14 dijboioskii, 19. 



i8. URANIDEA REINII (Hilgendorf). 



Coitus reinii Hilgendorf, Sitzungsbericht der Gesellschaft naturforschender 

 Freunde zu Berlin, 1879, p. 105; " Yeso and South Nippon." 



Head 3i in length, without caudal; depth of head 5^. Dorsal IX, 

 17 to 20; anal 13 to 15; pectoral 13 to 16; ventral 1, 3. 



Vomer toothed. Skin of head with raised points; over the pectoral 

 are fine prickles; no spines on snout. Preopercle with 3 spines, the 

 upper one simple and curved, the two lower ones directed forward; 

 subopercle with a covered spine on the lower anterior edge. Lateral 



