4 CALIFORNIA ACADEMY OF SCIENCES. 



To this genus should be referred Scopelus engraulis Giin- 

 ther. Challenger Report, Deep Sea Fishes, 197. 



2. Diaphus theta sp. no v. 



Types, eleven specimens, .033-. 065 m. long: from the mouths of several 

 species of Sebastodes. Off Point Loma. C. H. E., collector. 

 Catalogue No. 1003. 



Head, 3-3 K ; depth, 33^-4; D. 11 -13; A. 9-12; 

 lat. 1. 34. 



General shape of the head as in M. viiilleri (see Goode, 

 Hist. Aquat. Animals, pi. 203), the tail deeper; the pec- 

 toral placed lower. 



Compressed, deepest at nape, tapering evenly above 

 and below to the caudal peduncle, whose depth is equal 

 to half the greatest depth. Head short and deep, its depth 

 i^ in its length; profile convex, not encroached upon by 

 the low supraorbitals; nasal ridge inconspicuous. 



Orbit 3 in head, 3^ in interorbital. 



Preopercle little more oblique than in M. californiense 

 and miillcri; maxillary i^ in the head. 



Scales entire. 



Origin of dorsal tin little nearer tip of snout than to or- 

 igin of caudal; base of dorsal 2-2^ in distance from base 

 of middle caudal rays to last dorsal ray, which is slightly in 

 advance of the origin of the anal; adipose fin equidistant 

 from base of middle caudal rays and last dorsal ray; ven- 

 trals reaching little beyond origin of anal; pectorals mi- 

 nute, not reaching ventrals in large specimens; placed 

 very low, little higher than in M. bi-achycJur. 



A conspicuous phosphorescent spot on snout just in 

 front of each eye (the remainder of those on head some- 

 what obscured through digestion) ; five pairs of phospho- 

 rescent spots on breast, five pairs on belly, fourteen pairs 

 from origin of anal to caudal, none on base of middle 

 caudal rays, the remaining spots as in californiense with 



