492 MYLIOBATID.E. 



appears to be distinguislied from M. nieuhojii by a less broad disk. 

 The narrowness of the teeth, length of the tail, and probably also 

 the coloration are signs of the immature state of the examples 

 examined, but not specific characters. 



22. AETOBATIS. 



Aetobatis, Miill. Sf Henle. 

 Stoasodon, Cantor. 



Form of the head, body, and tail as in Myliohatis. The nasal 

 valves remain separate, each forming a long flap. The lower dental 

 lamina projects beyond the upper. Teeth flat, broad, forming a 

 single series, equivalent to the median series of Myliohatis, there 

 being no small lateral teeth. 



Tropical seas. 



1. Aetobatis narinari. 



Narinari, Marcf/r. pp. 175, 176; TVilluffhbi/, p. 66, tab. C 1. fig. 6. 

 Raja narinari, Euphrasen, Vet. Ak. mja Handl. 17!!0, xi. p. 217 ; 



m. Schn. p. .361. 



flagellum, Bl. Schn. p. 361, tab. 73. 



Russell, Fish. Coram, i. tab. 8. 



Kaja guttata, Shaw, Gen. Zool. v. 2. p. 285, pi. 142. 



Myliobatis narinari, Cuv. Regne An. ; Ben. in Life of Raffles, p. 694 ; 



Affciss. Roiss. Foss. iii. pi. D. 

 Raja quinqueaculeata, Quoy S)- Gai?n. Voy. Uran. p. 200, pi. 43. 



fi?. 3. 

 Aetobatis narinari, Midi. Sf- Henle, p. 179,- Bleek. Verh. Bat. Gen. 



xxiv. Flag. p. 87 ; Dimieril, Elasmobr. p. 041 ; Day, Fish. Malab. 



p. 280. 

 flagellum, Miill. 8f Henle, p. 180 ; Blyth, Joum. As. Soc. Beny. 



1860, p. 37 ; Dnmeril, I. c. p. 642. 

 Myliobatis eelteukee, Riipp. N. W. Fisch. p. 70, taf. 19. fig. 3 (teeth). 

 Goniobatis flagellum, Ayass. Proc. Bost. Soc. Nat. Hist. vi. p. 385. 

 macroptera, M'Cleh. Calc. Joum. Nat. Hist. 1841, i. p. 60, pi. 2. 



fig. 1. 

 Stoasodon narinari, Cant. Mai. Fish. p. 434. 



Aetobatis latirostris. Dumeril, Arch. Mus. x. p. 242, pi. 20, or Elas- 

 mobr. p. 643 ; Giinth. Trans. Zool. Soc. 1868, p. 491. 

 laticeps, Gill, Attn. Lye. Nat. Hist. Netv York, viii. p. 137. 



Body smooth. Dorsal fin situated between the ventrals. Disk 

 generally with numerous round bluish-white spots. 



The teetli of the lower jaw are sometimes angularly bent, some- 

 times nearly straight. Our series of examples shows clearly that 

 this difference is individual and docs not constitute a specific cha- 

 racter. 



Tropical seas. 

 a. Half-grown female : skin. Jamaica. Purchased of Mr. Parnell. 

 6. Adult female : skin. Bahia. Purchased of M. Parzudfiki. 



c. Half-grown. Bay of Panama. From the CoIIectioii of Messrs. 



Dow and Salvin. 



d. Young : skin. Pinang. From Dr. Cantor's Collection. 



