10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iie 



Color: Head and body brown, vertical fins black. Beneath super- 

 ficial brown pigmentation of scales and scale pockets large, dark 

 chromatophores distributed regularly on body. 



Distribution. — Known only from the type localities. Taken in a 

 beach seine and at 3-10 fathoms. 



Comments. — The holotype extruded fertilized eggs that must have 

 been close to hatching and that are about 0.9 mm. in diameter. The 

 Nigerian paratype has paired ovaries about 25 mm. long. Each 

 contains an estimated 3,000 unfertilized eggs (based on counts and 

 volumetric displacement on }^ of 1 ovary), which are about 0.5 mm. 

 in diameter. Eggs are of about the same size in all parts of the ovary; 

 however, the eggs closest to the posterior end are more densely granu- 

 lar. One Liberian paratype (USNM 191732) extruded granular 

 (unfertilized) eggs of about 0.5 mm. in diameter. The other Liberian 

 specimen has its ovaries packed with an estimated several thousand 

 young fish. The embryos are between 4 and 5 mm. long and have 

 small yolk sacs and open choroid fissures. Elongate processes are 

 attached to the embryo a short distance behind the yolk sac. 



Oligopus robiistus (Smith and Radcliffe) 



Grammomts robustus Smith and Radcliffe in Radcliffe, 1913, p. 168, pi. 13, fig. 4 

 (original description, "Albatross" St. 5409, 10°38' N., 124°13' E.— Norman, 

 1939, p. 79 (Gulf of Aden, 457-549 m.) .— Kamohara, 1954, p. 5, fig. 3 (5 

 specimens from Kochi market, description). 



Bythites lepidogenys (not Smith and Radcliffe, 1913) Kamohara, 1952, p. 93 (3 

 specimens from Mimase, description). 



Study material. — Holotype, USNM 74149, male. 



Counts amd measurements. — (Measurements given in mm., 

 followed by percent of standard length in parentheses) D 87; A 62 

 pectoral 25; vertebrae 46; caudal 8; vertical scale rows about 75 

 SL 129; body depth at D origin 32.5 (25.2); predorsal 42.2 (32.7) 

 preanal 71.1 (55.1); HL 40.4 (31.3); snout 6.5 (5.0); orbit 6.5 (5.0) 

 upper jaw 22.0 (17.1); greatest maxillary width 8.2 (6.4); greatest 

 head width 21.2 (16.4). Additional meristic and morphometric data 

 are presented by Kamohara (1954). 



Description. — Squamation: Patch of scales present on nape. 

 On sides of head, scales present on opercle and on area in front of 

 opercle extending forward nearly to eye, dorsally to level of top of 

 opercle, where scaleless lateral canal separates dorsal and lateral scale 

 patches, and ventrally to area behind maxillary. 



Lateralis system: Lateral canal with 1 pore near upper angle of 

 opercle. Supraorbital canal with 2 pores: 1 below, and in front of, 

 anterior nostril tube; the other immediately above tube. Infra- 

 orbital canal with 6 pores: 3 beneath nostrils over upper lip; 1 at 



