REVIEW OF OPHIDIOID FISH GENUS OLIGOPUS — COHEN 15 



about 3 fathoms. Here recorded from Guadalupe Island and Baja 

 California. 



Comments. — The data on dorsal and anal fin ray counts presented 

 in table 3 indicate that the Galapagos-Guadalupe populations and 

 the Baja California populations of 0. diagmmmus have differentiated. 

 Under ordinary circumstances I would recognize them as named taxa ; 

 however, it seems likely that additional populations will be discovered 

 in the tropical eastern Pacific, and this, combined with the puzzling 

 nature of sexuality in this species, makes me hesitant to do more than 

 point out the differences and the problems involved in interpreting 

 them. 



Oligopus claudei (Torre) 



Benthocometes claudei Torre y Huerta, 1930, opposite p. 171, unnumbered plate 

 (original description, Cuba, Matanzas Bay) ; 1931?, p. 231, fig. (brief dis- 

 cussion) . 



Bathyslorreus claudei Howell Rivero, 1934, pp. 69-72, pi. 7 (new genus proposed, 

 description). 



Grammomis mowbrayi Grey, 1951, p. 154, fig. 1 (original description, type locality, 

 Bermuda). — CoUette, 1962, p. 443 (Bahamas). 



Study material. — The holotype of B. claudei, MCZ 33943 (in very 

 poor condition) . Three specimens ANSP Chaplin Bahama collections, 

 St. 513; about Yi mile N. of the center of Green Key, Bahamas; taken 

 from inside a small, isolated coral head at a depth of 50 feet. One 

 specimen, UP 1150; Puerto Rico, La Parquera, 6 miles offshore at 

 vertical ledge, 65 feet. One specimen, UP 1151, Curasao, cave at 

 shore, about 100 meters SE. of entrance to bay. 



Counts and measurements. — See table 4. 



Description. — Squamation: Scales present in patch over nape, on 

 side of head over opercle and cheek, extending forward to a point less 

 than eye diameter behind eye and ventrally to patch behind posterior 

 margin of maxillary. 



Lateralis system: Lateral canal with 4 pores in row: the most posterior 

 above upper angle of opercle ; the most anterior at junction of lateral canal 

 and infraorbital canal. Supraorbital canal in Bahaman specimens 

 with 4 pores extending in straight line from most anterior in front of 

 anterior nostril to most posterior over rear half of eye; Puerto Rican 

 specimen with only the 2 most anterior pores; and Curagao specimen 

 with the 3 most anterior pores on one side and the 2 most anterior pores on 

 other side. Infraorbital canal with 8, 9, or 10 pores: 3 beneath nos- 

 trils; 1 smaller pore beneath eye about midway between orbit and lip; 

 2 or 3 pores in skin along maxillary sheath; and 2 or 3 pores in row 

 extending up to lateral canal. Preoperculomandibular canal with 

 9-11 pores: 2 at tip of dentary, 1 opening anteriorly, the other posteri- 

 orly; 1 beneath lower lip at level of anterior margin of eye; row of 3 



