362 PROCEEDINGS OF THE ACADEMY OF [Apr., 



fleshy, front edge free. Upper and lower buccal membranes well 

 developed. Nostrils near together, anterior in slight cutaneous 

 tube, and posterior simple pore with simple cutaneous rim. In 

 position anterior nostril about opposite middle of eye and posterior 

 about opposite upper rim of eye. Interorbital broad and slightly 

 convex. 



Gill-opening high, mostly above upper level of eye, and small, 

 its aperture not more than half of eye. Downwards and below to 

 disk skin forms slight fold. 



Skin perfectly smooth and without any conspicuous or evident 

 pores, also without spines. 



Dorsals separated by a deep notch, though their fleshy bases at 

 least continuous. First dorsal smaller and more rounded than 

 second, edge also slightly notched and of quite fleshy texture. Its 

 insertion about over front of gill-opening. Second dorsal with 

 rays more free or defined, though simple, and more uniform. Anal 

 like second dorsal. Caudal moderate, rounded. Pectoral moderate, 

 with long and moderately inclined base and composed of simple 

 rays. Pectoral extends as far posteriorly as disk. Latter quite 

 large, circular, and not ensheathed anteriorly by lower pectoral 

 rays. Edge of disk entire. Vent close behind disk. 



Color in alcohol largely pale brownish, fins paler or more or less 

 whitish. Under a lens, head and trunk almost everywhere finely 

 dotted with minute specks of darker shade. They also completely 

 cover first dorsal, together with upper and lower regions of pectoral. 

 On posterior ventral region darker dots quite sparse or inconspicuous. 

 Iris pale slaty. 



Length 21 mm. 



Type, No. 2,950, Museum of Princeton University. Though the 

 precise locality in Greenland is lost, Mr. Silvester thinks the specimen 

 was probably taken in Ulriks Bay. 



Only the type known. It is very similar to Lethotremus muticus 

 Gilbert, from the Aleutian Islands, differing in the narrow notch 

 between the dorsal fins, fewer dorsal rays, larger vertical fins, larger 

 ventral disk, uniformly dotted coloration, etc. It agrees, however^ 

 in the smooth skin and dorsal spines. Gilbert gives the eye as 

 very large, 2^ to 2| in head, though his figure indicates that at the 

 very least it is 4. His largest example was 30 mm. long.- 



(Named for Mr. Charles W. McAlpin, to whom the University is 

 indebted for assistance in securing the present collection.) 



2 Rep, U. S. F. Com., XIX, 1893 (1895), p. 449, PI. 31. Unimak Pass, Alaska. 



