226 EXPEDITION OF THE "ALBATROSS," 1899-1900. 



middle siipra-an;il ; second antero-anal nearest the anal base, the third, fourth, 

 and fifth forming a gently diverging curved line which passes behind the 

 postero-latenil. Postero-lateral on the twenty-fourth scale of the lateral line 

 near the lateral line but not in contact with it, its distance from fifth antero- 

 anal nearly twice that separating fifth from fourtli. Postero-anals 5 (or C) 

 in number. Precaudals in a wide shallow curve, nearly evenly spaced, the 

 fourth distinctly below the lateral line. 



Color apparently deep brown, lighter on cheeks, mandibles, and snout; 

 black on opercles. 



Two co-types from Ilydrographic Station 3797 (A. A. 25), and two from 

 3798 (A. A. 27), near the Marquesas Island.s. All are smaller than the type. 



Diaphus agassizii, sp. nov. 

 Plate S. 



Type 21 mm. long, from Ilydrographic Station 3798 (A. A. 27), near 

 Nukaliiva I.sland, Marquesas Group; taken witli open intermediate net down 

 to 300 fathoms. 



Characterized by tlie deep compressed head and snout, by the ab.scnce of 

 preocular or subocular luminous areas, and by the normal number and ar- 

 rangement of photophores. In Diaphus urolampus, the only other species of 

 the genus described without preocular luminous area, there are but two 

 supra-anals, and the second and third ventrals are equally elevated. 



Total length, excluding caudal, 18 mm. ; length of head, 32 hundredths 

 of this length ; diameter of eye 7 ; length of snout G ; length of ma.xillary 

 23; greatest depth of body 23 ; least depth of caudal peduncle 9; di.stancc 

 from snout to front of dorsal 4.5 ; to front of ventrals 42; to front of anal 

 60 ; to adipose fin 78. 



D.- 14 ; A. 16 ; P. 13 ; scales in lateral line 36 to 38 ; gill-rakers 8 + 13. 



Head unusually deep and compressed; eye small, but little above middle 

 of head, barely longer than snout; maxillary not widened posteriorly, its 

 middle point a trifle behind vertical from center of eye ; preopercular 

 margin comparatively little oblicjue. 



Pectorals mutilated but evidently weak, probably not reaching the 



