488 MVLIOBATlD.i;. 



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



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

 lection. 

 h. Half-grown: stuffed. India. Presented bj-T. E. J. Boileau, Esq. 

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

 k. Foetus. From the Haslar Collection. 



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



5. Pteroplatea tentaculata. 



Aetophitea tentaculatn, Miill. ^- Jlenlc, p. 175; Dunieril, FJasmohr. 

 p. G:W. 



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

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

 round light spots. 



Ked Sf'ii ; Iiulifiii Ocean. 



0. Pteroplatea zonura. 



Aetoplatea zonurus, Blcek. Verh. Bat. Gen. xxiv. I'latj. p. 79. 



No tentacle behind the spiracle. Tail lialf as long as flic \nn\\ 

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

 round whitish spots. 



Batavia . 

 n. Type of th(' s))ecies. Yroin Dr. Bleeker's ('dlleetion. 



Fam. i\. MYLIOBATIDtE, 



The disk is very broad in consequence of" the great 

 development of tlie ])ectoral fins, whicli, liowever, 

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

 V xtremity of the snout as a pair of detached (cephalic) 

 fins. 



Group A. MYLIOBATINA. 



21. MYLIOBATIS^ 



.Myliobatis, Cvv. Jicf/ne Anint. 



Head free from the disk; snoul with a soft api)endage in front, 



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



quadrangular llap. Teeth hexaiigular, large, Hat, tessellated; those 



in the middle miu'h broader tlian long ; sevoj-al narrower series on 



* 1. Myliobatis bisjiinosu^, S/<>,-p>-, T'rac. Ko.'^l. Sue. Sat. Hist. 1841, i. p. .W. 



and Boat, -lourn. S((f. fli.it. iv. ]>. 187 ; A//rrn, ihid. p. L'DO, pi. 13. 



fif(. 1 ; Myliobnli'^ aciiln, At/rc.^. Pror. lin^t. Sor. Nat. Hist. i. p. 0;"» : 



Hfarrr, Mem. Am. Acad. ix. 1807. p. 'Mi>, pi. '.'/.). (jg. 4. -Long Island. 



'J, freniinvillii. /,fsiirnr, Jourti. Ac y'ti/. .V. Philnd. iv. p. 111. 



