310 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



? Rhynchohatus columnae Dunckek, Mitt. Naturhist. Mus. Hamburg, vol. 21, 



p. 193, 1904 (locality ?). 

 Rhinobatos rhinohatos (not Linnaeus) Fowlek, List Fish. Malaya, p. 13, 1938 



(reference). 



Snout moderate, bluntly pointed, margins little concave; rostral 

 ridges more or less separated throughout their length, parallel ante- 

 riorly, diverging little posteriorly; eye 3% to 3% in snout; eye 

 diameter with spiracle little greater than space between spiracles; 

 mouth nearly straight, width 2l^ to 2i/^ in preoral length; nostrils 

 moderately long, 1% in mouth width, internarial 1% in nostril, front 

 valve extending inward to level of inner nostril edge or little be- 

 yond. Both folds of spiracle strongly developed, outer more 

 prominent, space between spiracles 2i/2 in snout. 



Skin covered with minute denticles, rather smooth to touch ; series 

 of rather small close-set spines in median line of back, 2 to 4 on each 

 shoulder, several around orbits and above spiracles; all spines 

 stronger and sharper in male. 



First dorsal little more than twice high as long, origin behind 

 ventral base li^ to ly^ in that between 2 dorsals, base 2i^ to 2% in 

 interdorsal. 



Color not given. Length, 415 mm. (Norman.) 



India, Ceylon. Type in the British Museum. 



RHINOBATOS LIONOTUS Norman 



Rhinoiatus Uonotus Nokman, Proc. Zool. Soc. London, 1926, p. 961, text fig. 14 

 (rostra) (type locality: East Channel, mouth of River Hughli, in 40 

 fathoms). 



Rhinobatis schlegeli (not Miiller and Henle) Ann and ale, Mem. Indian Mus., 

 vol. 2, p. 15, 1909 (ofE Hugli River mouth and Mutlah River). 



Snout moderate, bluntly pointed, margins scarcely concave ; rostral 

 ridges more or less separated throughout their length, j)arallel an- 

 teriorly, diverging posteriorly; eye 3% in snout, eye with spiracle 

 about equals space between spiracles; mouth nearly straight, width 

 2% in preoral length; nostrils of moderate length, oblique, 1% in 

 mouth width, 1% times internarial, front valve extending inwards 

 about to level of inner nasal edge. Both folds of spiracle very 

 strongly developed, outer more prominent. 



Skin covered with minute denticles, smooth to touch; series of 

 minute tubercles in median line of back, single one on each shoulder 

 and several around orbits and above spiracles. 



First dorsal twice high as long, origin distance behind bases of 

 ventrals about equals interdorsal, base 2% in interdorsal. 



Color not given. Length, 500 mm. (Norman.) 



Bengal. Type in the British Museum. 



