PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUIVI. 



59 



Lateral line deflected downwards suddenly at posterior extremity of 

 second dorsal, thence posteriorly along center of caudal peduncle, and 

 anteriorly parallel to dorsal outline ; pores simple, 35-37. 



Body scaleless, entirely smooth. 



Color olivaceous above, lighter below ; upper portion maculated with 

 darker; fins with small dark spots on the membrane; a dark band 

 across caudal. 



Two specimens (Nos. 1 and 3) from fresh w\ater, near Saint Paul's, 

 Kodiak, collected by W. J. Fisher. In No. 1 the dorsals are separated 

 by a considerable space ; in No. 3 by a smaller^ space. One of these is 

 in the United States National Museum, numbered — . 



Numerous specimens from the Aleutian Islands, collected by Captain 

 Greenebaum, present no difference except in the more or less complete 

 union of the dorsals, and their smaller size. The latter are probably 

 half grown. 



As the fin-rays and other characters agree closely, I am inclined to 

 think the separation of the dorsals either an individual character, or 

 one due to greater age. 



Mr. Fisher's examples were obtained in fresh-water lakes formed by 



the melting snows, and communicating with the ocean only by shallow 



outlets. This species differs from those of the genus found in the 



United States by its smaller mouth, lower fins, and the. four soft rays 



in the ventrals. In all these respects it resembles the European Ura- 



nidea gohio. 



Dimensions. 



No. 1. 



No. 2. 



No. 3. 



Total length ■ 



Greatest depth 



Depth of caudal peduncle • 



Length of head 



Width of head 



Longitudinal diameter of orhit 



Length of snout ... • 



Tip of snout, along top of head, to origin of first dorsal 



Length of base of first dorsal 



Length of base of second dorsal 



Tip of snout to insertion of ventrals 



Length of ventrals 



Length of p(ct;ii-als 



Tip of lower j aw, along abdomen, to origin of anal 



Length of anal base 



Number of dorsal rays 



Number of anal rays 



Number of pectoral rays 



Number of caudal rays 



4.87 



.85 



.29 



1.06 



.94 



.21 



.30 



L30 



.75 



1. C2 



1.12 



.73 



1.00 



2.36 



1.28 



8-19 



14 



14 



5-10-2 



