igog.] N. Annandale : Report on the Batoidei. 19 



A. All the denticles with stellate bases. 



(a) Distance between the e^^es less than half the length of the snout. 

 Base of tail broad and flat . . . . T. microps- 



B. All or most of the dorsal denticles with round or polygonal bases. 

 (a) Dorsal denticles forming a regular wine-glass-shaped figure with 



well-defined borders. 

 ia') Distance between the eyes less than half the length of 

 the snout .. .. . . T. hleekcri . 



{d^) Distance between the eyes more than half the length 

 of the snout . . . . . . T. gcyrardii . 



{b) Denticles not forming a regular figure on the back. 



(/;') Dorsal denticles, if present, confined to the middle Hue. 

 Dorsal surface pink or red . . . . T. bcnnettii . 



(/?') Dorsal denticles absent from the pelvic fins, flat and 

 rounded. Dorsal surface olive-brown with faint pale 

 spots scattered all over the disk 7.((/rorA'//,sp.nov. 

 (h-) A row of sharp .spines running down the middle of 

 the back and the base of the tail. Dorsal surface 

 olive-brown, without spots . . T. jenkinsij , sp. nov. 



(//) Flat dorsal denticles irregularly interspersed with small 

 stellate ones on the body ; the pectoral fins covered 

 with small stellate denticles. Dorsal surface grey- 

 ish . . . . . . T. margiuiitits. 



(5^) Flat dorsal denticles irregularly interspersed with small 

 stellate ones, which are absent from the pectorals. 

 Dorsal surface of adult pale brown with darker mark- 

 ings; of young white with black spots T. itarnak. 



(¥) No stellate denticles. Dorsal surface of adult dark 

 brown with a bold honeycomb pattern of duU j^ellow. 



T . favus, sp. nov. 



II. Small species (adults less than 40 cm. across the disk, young not more 

 than 10 cm.). 



A. Distance between the eyes about one-third the length of the snout. 



Dorsal surface dark brown . . . . . . T . zugei. 



B. Distance between the eyes less than half the length of the snout. 



Dorsal surface pale brown . . . . T. imbricata. 



C. Distance between the eyes almost as great as the length of the snout. 



Dorsal surface grey with bluish spots . . . . T. kulilii . 



The only species named in the key I have not seen is Trygon bennettii. Dumeril 

 (Nat. Hist. Poissons, i, p. 596, 1865) records a specimen of this species measuring 43 

 cm. across the disk, while one of Henle and Miiller ' s was rather larger ( ' ' Plagiostomen , ' ' 

 p. 161). All the figures I have seen, however, look as though they represent young 



