200 PROCEEDINGS OF THE }^\\TIONAL MVSEVM. vol.51. 



opercular regions) with shorter, stronger, and more numerous spines ; 

 under side of head completely naked ; inner edge of shoulder girdle 

 naked; nasal fossa naked, its longer axis horizontal, 0.4 that of orbit; 

 nostrils without raised edges. Lateral line rising anteriorly from 

 below origin of second dorsal in a low convex curve. 



First dorsal spine short, but comparatively well developed, its 

 anterior portion conic, separated by a groove from the posterior por- 

 tion, which is lower and much more compressed than the anterior 

 portion ; the second spine very long and slender distally, its length 

 exceeding that of head by a distance equal to length of snout, 

 armed with 16 widely and irregularly spaced serrations ; base of first 

 dorsal about as long as snout, 1.2 in interdorsal space; pectoral 

 pointed, half as long as head ; outer ventral ray with a filament ex- 

 tending to the seventh anal ray, the second ray extending to between 

 anus and origin of anal. 



Anus nearly midway between origin of anal and a line joining the 

 ventral bases, preceded by a black naked area, which extends for- 

 ward in a triangular shape to between ventrals. The anterior end of 

 this scaleless area is occupied by a small round area covered with 

 papillae. This structure is evidently homologous with the ventral 

 fossa mentioned in the descriptions of other species. 



Light brown on back and sides of trunk, and on tail ; shading into 

 black on belly. Branchiostegal membrane grayish-brown; gular 

 membrane and under side of snout dusky; lining of buccal, 

 braanchial, and abdominal cavities black; no lighter margin on the 

 branchiostegal membrane. Dorsal spine, and proximal half of soft 

 rays of first dorsal blackish, the distal half of the soft rays white ; 

 second dorsal light ; ventral black ; pectoral and anal dusky. 



Measurements of the type in hundredths of length to anus (64.5 

 mm.) : Length of head, 73 ; length of orbit, 20 ; least interorbital width, 

 15.5; least suborbital width, 9; distance between orbit and preoper- 

 cular margin, 24 ; length of snout, 22 ; length of maxillary, 22 ; length 

 of barbel, 10 ; depth of body, 56 ; width of body over pectorals, 39 ; 

 distance from center of anus to origin of anal, 13.5 ; anus to base of 

 outer ventral ray, 16.5; base of outer ventral ray to isthmus, 26; 

 height of second dorsal spine, 96.5 ; height of third dorsal ray, 68 ; 

 base of first dorsal, 22 ; interdorsal space, 27 ; height of second dorsal, 

 9 ; height of anal, 20 ; length of pectoral, 37 ; length of outer ventral 

 ray, 40; length of second ventral ray, 22. 



Z. spinosus differs from the following species, L. proximus^ in tlie 

 naked under side of the head ; longer dorsal spine ; longer spinules 

 on scales ; longer teeth in the outer premaxillary series ; and in numer- 

 ous other details. 

 Only the type Iniown. 



