FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 339 



Uniform brown above, edges of disk not narrowly white. Under 

 surface of body cream white. 



Natal. 



Although Heteronarce regani is based on an example 190 mm. long, 

 there is little in the original description to contend for its separation 

 as a distinct species. Its caudal is described with the "lower margin 

 broadly rounded, hind margin oblique, slightly sinuous." The figure 

 shows the hind caudal edge truncate. 



1 example, A.N.S.P. East London, South Africa, in 40 fathoms. H. W. Bell 

 Marley. Length, 260 mm. Type of Narcine natalensis. 



Genus BENTHOBATIS Alcock 



Benthobatis Alcock, Ann. Mag. Nat. Hist., ser. 7, vol. 2, p. 144, 1898. (Type, 

 Benthobatis moresbyi Alcock, monotypic). 



Disk little longer than broad. Tail distinct, longer than disk, 

 without lateral folds. Snout more than one-third of disk. Eyes 

 small, rudimentary. Mouth small, protractile. Teeth in bands. 

 Front nasal valves confluent in quadrangular flap. Upper lip distinct. 

 Electric organ between head and pectoral. Spiracle moderate, close 

 behind eyes. Skin soft, smooth. Two dorsals. Caudal well 

 developed. 



Rays of the deeper waters of the Bay of Bengal and the Gulf 

 Stream. 



BENTHOBATIS MORESBYI Alcock 



Benthobatis moresbyi Alcock, Ann. Mag. Nat. Hist., ser. 7, vol. 2, p. 145, 1898 

 (type locality: Off Travancore coast in 430 fathoms) ; Illustr. Zool. Inves- 

 tigator, pt. 4, pi. 26, fig. 1, 1896; Cat. deep sea fishes Investigator, p. 18, 

 1899 (types).— Lloyd, Rec. Indian Mus., vol. 1, p. 4, 1907 (lat. 15° 55' 30" 

 N., long. 52° 38' 30" B., in 585 fathoms, Arabian Sea). — Annandale, Mem. 

 Indian Mus., vol. 2, pi. 3a figs. 5 (mouth), 5a (teeth), 1909. — Lloyd, Mem. 

 Indian Mus., vol. 2, p. 145, 1909 (reference). — Garman, Mem. Mus. Comp. 

 Zool., vol. 36, p. 294, 1913 (compiled). 



Head 4^% to end of body; disk 2l^. Snout 2% in disk length; 

 eyes 2 very small unpigmented spots, size of pin head ; mouth small, 

 protractile; teeth small rhomboid plates, posterior angle strongly 

 and acutely extended, arranged in mosaic in about 10 very oblique 

 series in either jaw; interorbital 5% in disk length. Gill openings 

 large, well spaced, last nearer vent than mouth. Spiracle large, 

 3% in interspiracular space, which 2% in snout. 



First dorsal inserted little before hind limit of ventrals, length 

 3% in disk; second dorsal 3%; caudal 2%, end obtuse; pectorals form 

 elongate disk, width li^ its length ; ventrals separate, not notched. 



Purplish black; scattered on disk and marginally some small white 

 pores, not much smaller than eyes. Tips of second dorsal and caudal 

 sometimes white. Length, 357 mm. (Alcock.) 



Arabian Seas, India. 



