JI.VCRURUS CANUS. 217 



■with similar spines. Top of head and snout covered witli scales ; lower sur- 

 face of head, below the snout and the suborbital ridge, naked. 



Description taken from an eight iucli specimen. 



Black on opercles, chest, and belly ; white over the nmcous chambers, 

 from the crown and the suborbital region forward to the end of the snout ; 

 blackish tinu;ed witli red on the nuiscular tracts. 



This .species appears to be somewhat closely allied to Codocephalus aci- 

 penscrinus Gilb. and Cram.; it differs in length of snout, size of eye, and 

 carinas of scales. 



Macrurus canus sp. n. 

 Plate XLIX.fij. 2; Plate LXXXIV. fi<js. 1, 2, Lat. Syst. 



Br. r. 6; D. 11 + 105; A. 107; Y. 7; P. 10-21. 



The form in this species resembles that of M. ^MralMus Giint., but the 

 snout is shorter and there are marked differences in the fins; as, for in- 

 stance,. in the anal, which originates much in advance of the second dorsal. 

 The body is compressed, in depth one sixth of the total length, and the caudal 

 region is slender. Head compressed, angular, one fourth of the total, sharp 

 at the snout, scales rough. Snout medium, one third as long as the head, 

 more than the length of the eye or the width of the interorbital space, 

 sharp pointed, translucent, sharp-edged at the sides, ■with a low rostral keel 

 extending back to the interorbital space. Skull with a short ridge at the 

 nape, one at each side of the parietal region, and one above each orbit to the 

 upper angle of the operculum and to the rostral edge. These last with the 

 suborbital ridges, which have nearly the entire length of the liead, serve to 

 protect the well developed mucous chambers. There is also a ridge around 

 each nasal chamber. The parietal ridges turn outward at the nape. The 

 distance from the end of the snout to the intermaxillaries equals that to the 

 orbit. Mouth small, inferior; maxillary extending below three fifths of 

 the orbit. Teeth small, subequal, in villiform bands. Barbel small, one 

 third of the length of the eye. Between the ridges the frontal region is 

 slightly concave. Eye large, two sevenths as long as the head, shorter than 

 the snout, equal to the width of the interorbital space. Cheeks vertical to 

 slightl}^ convex. Mucous cavities of the head very large. A circular space 

 free from scales on the chest between the ventrals. Dorsal origin above the 



