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



Centrobranchus choerocephalus Eowler. 



Proc. Ac. Nat. Sci., Phila., 1903, 55, p. 754 ; Gilbert, Bull. U. S. Fish Com., 190,5, 23, p. 594 pi 

 69, fig. 1. 



One small specimen, from Lat. S. 16° 39', Long. "W. 149° 11', extends the 

 range from the Hawaiian Islands to a point well south of the Equator. No 

 differences are apparent between this and northern specimens. The anals 

 number 6 + 11 on one side, 5 + 10 on the other. 



Diaphus nanus, sp. nov. 



Plate 1. 



Type 17 mm. long, from Hydrographic Station 3798 (A. A. 27), near 

 Nukuhiva Island, Marquesas Group ; taken in open intermediate net from 

 surface to 300 fathoms. 



Most nearly related to D. theta Eigenmann and Eigenmann, from the 

 coast of California, agreeing with this species in its short, bluntly roundeil 

 snout, its pair of small circular preocular organs, which are directed forwards, 

 but little visible laterally, and are closely approximated on the median line 

 of the snout ; the subocular organ i.s also short and narrow, often with a 

 minute detached point posteriorly. The species differs from D. ihda among 

 other respects in the more slender form, the more elevated first antero-unal, 

 the angulated supra-anals, and the closer approximation to the lateral line 

 of the upper supra-anal, the postero-lateral, and the fourth precaudal. 

 Dicqilms fiik/cns Brauer apparently has the preocular not circular in shape, 

 widely visible laterally, and the upper series of photophores more distant 

 from the lateral line. 



Measurements in hundredths of total length to base of caudal : length of 

 head 31 ; depth of head at occiput 21 ; axial length of snout 4 ; diameter 

 of eye 12 ; length of maxillary 19 ; greatest depth of body 23 ; least depth 

 of caudal peduncle 11 ; distance from snout to origin of dorsal 48; to in- 

 sertion of ventrals 46: to origin of anal 61 ; longest gill-raker 5. 



D. 13; A. 13; P. 12; V. 9 ; lateral line 36; gill-rakers 5 + 13, includiuj,' 

 all rudiments, Br. 9. 



