FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 307 



f. Nostril length less twice mouth width, greater than 

 internarial. 

 ??\ Snout expanded at tip; nostril length 1% in 

 mouth width, nearly twice internarial. 



thouin 

 n^. Snout not expanded terminally. 



o\ Nostril length nearly equals mouth width, 



which 2^ to 2% times internarial — typus 



o^ Nostril length 1^^ to 1% in mouth width, 



which 1% to 1% times internarial— halavi 



Subgenus Leiobatus Rafinesque 



RHINOBATOS HOLCORHYNCHUS Norman 



Rhinoiatus holcorhyncUns Norman, Ann. Mag. Nat. Hist. London, ser. 9, vol. 

 9, p. 318, 1922 (type locality: Natal). — Barnard, Ann. South African Mus., 

 vol. 21, pt. 1. p. 61, fig. 9c (mouth and nostrils), pi. 3, fig. 7, 1925 (Natal 

 and Zululand).— NoBMAN, Proc. Zool. Soc. London, 1926, p. 957, fig. 10 

 (rostra) (type). — Barnard, Ann. South African Mus., vol. 21, pt. 2, p. 1014, 

 1927 (note). 



Rhinodatus natalensis Fowxer, Ann. Natal Mus., vol. 5, pt. 2, p. 195, fig. 1, 1925 

 (type locality: Natal). 



Rhinohatus rasiis (not Garman) Fowler, Proc. Acad. Nat. Sci. Philadelphia, 

 1925, p. 192 (type of Rhino'batiis natalensis). 



Head to first gill opening 4% in total length. Snout 5% in head ; 

 eye 5i/^, 2 in interorbital ; mouth width 3% in head, nearly straight ; 

 nostril 5^4; antero-nasal space 2%, front nasal lobe feeble, extends 

 halfway in nostril length, hind valve % in nostril length; preoral 

 length 5 in total body length; interorbital 3% in head, crown de- 

 pressed, level, edges but slightly raised. Spiracle % of eye, with 

 prominent outer fold, inner small. 



First dorsal length 2i^ in head ; second dorsal length 2% ; caudal 

 2 ; pectorals form disk width ll^ in its length or 3 in total length. 



Slightly darker cloudings of brown down middle of back. 



Natal, Zululand. 



1 example. A.N.S.P. Natal Bluff, in 100 fathoms. H. W. Bell Marley. 

 Length, 294 mm. Type of Rhinohatus natalensis. 



RHINOBATOS FORMOSENSIS Norman 



Rhinoiattis formosensis Norman, Proc. Zool. Soc. London, 1926, p. 958, fig. 11 



(rostra) (type locality: Foimosa). 

 Rhinohatus schlegeli (not Miiller and Henle) GtJNTHEiR, Cat. Fishes British 



Mus., vol. 8, p. 446, 1870 (Formosa specimen). 

 Rhinohatus schlegelii Garman, Mem. Mus. Comp. Zool., vol. 36, p. 276, 1913 



(part). 



Snout long, bluntly pointed, margins straight or little concave; 

 rostral ridges rather narrow, more or less separated throughout their 

 length, nearly parallel anteriorly, diverging little posteriorly ; eye 4i^ 

 to 4% in snout, eye with spiracle nearly equals space between spira- 



