488 lIYLlOBATIDJi. 



«, f. Half-grown and young. Singapore. 



gl Half-grown. East-Indian archipelago. From Dr. Bleeker's Col- 

 lection. 

 ^. Half-grown: stuffed. India. Presented by T. E. J. Boileau, Esq. 

 i. Half- grown. Presented by the Zoological Society. 

 h. Foetus. From the Haslar Collection. 



/3. A rudimentary Jin in front of the caudal spine : Aetoplatea. 



5. Pteroplatea tentaculata. 



Aetoplatea tentaculata, 3IhII. Sf HenJe, p. 175 : DumSril, Elasmohr. 

 p. 630. 

 X tentacle behind the spiracle. Tail scarcely half as long as the 

 body, with an upper and lower ridge. Brownish, with scattered 

 round light spots. 



Red Sea ; Indian Ocean. 



6. Pteroplatea zonura. 



Aetoplatea zouurus, Bleek. Verh. Bat. Gen. xxiv. Flag. p. 79. 



No tentacle behind the spiracle. Tail half as long as the body, 

 with a lower cutaneous fold. Finely mottled with brown and with 

 round whitish spots. 



Batavia. 

 a. Type of the species. From Dr. Bleeker's Collection. 



Fam. 6. MYLIOBATIDtE. 



The disk is very broad in consequence of the great 

 development of the pectoral fins, which, however, 

 leave the sides of the head free, and reappear at the 

 extremity of the snout as a pair of detached (cephalic) 

 fins. , . 



Group A. MYLIOBATINA. 



21. MYLIOBATIS*. 



Myliobatis, L'uv. R<'yne Anini. 



Head free from the disk ; snout with a soft appendage in front, 



supported interiorly by fin-rays. Nasal valves coalescent into a 



quadrangular flap. Teeth hexangular. large, flat, tessellated ; those 



in the middle much broader than long ; several narrower series on 



* 1. Myliobatis bispiuosus, Storer, Proc. Bost. Soc. Nat. Hist. 1841, i. p. 53, 



and Bost. Joimi. Nat. Hist. iv. p. 187 ; Ayres, ibid. p. 290, pi. 13. 



fig. 1 ; Myliobatis acuta, Ayrcs, Proc. Bost. Soc. Nat. Hist. i. p. Go : 



Storer, Mem. Am. Acad. ix. 1867, p. 245, pi. 39. fig. 4. — Long Island. 



2. freminvillii, Lesiieur, Jonrti. Ac. Nat. tSc. Philad. iv. p. 111. 



