494 MYX-IOBATID^. 



six times as long as broad, and those of the adjoining series rather 

 more than thrice. The middle teeth of the lower jaw narrower than 

 those of the upper. Tail more than twice as long as the disk. 

 Brazil. 



3. Rhinoptera lalandii. 

 Miill. 8f Henle, p. 182 \ Dumcril, Elasowhr. p. G4o. 



Dentition of the upper jaw different from that of the lower. Five 

 or seven series in the upper jaw, the teeth of the middle sei'ies being 

 six times as broad as long, and those of the next following series 

 about twice as broad as long. Lower jaw with seven series, the 

 teeth of the middle series being four times as broad as long. Tail 

 nearly twice as long as the disk. 



Brazil, 



a. Young: stuffed. Purchased. 



4. Rhinoptera javanica. 



Mrniro, Phys. Fisck. taf. .34. figs. 2-4 (teeth). 



Rhinoptera javanica, MiUl. ^'- Hetile, p. 182, taf. 58 ; Bleek. Vcrh, Bat. 



Gen. xxiv. Flag. p. 89 ; Dumeril, Elnsmohr. p. 647. 

 affinis, Blcek. Nat. Verh. Holl. Maatsch. Wet. Haarlem, 180'J, 



Guinee, p. 19 (foetuB). 



Disk not twice as broad as long. Median notch of the snout 

 shallow. Seven series of teeth in each jaw, those of the middle 

 upper series about four times as broad as long, and not quite twipo 

 as broad as the next adjoining teeth. Lower teeth rather narrower 

 than the upper. Tail not twice as long as the disk. 



East Indies. 



a. Foetus. Java. From Dr. Bleeker's Collection. — Type of Hh. 



afinis. 

 h, c. Upper jaws of adult examples. 



A large example, obtained by the Antarctic Expedition, without 

 teeth, and generally in very bad condition, has been named Rh. 

 smithii by Dr. Gray. It probably belongs to this species. 



5. Rhinoptera quadriloba. 



Raja bonasus, Mitch. Trans. Lit. i^- Phil. Soc. New York, i. 1815, 



p. 479 (no descr.). 



quadriloba, Lesneiir, Journ. Ac. Nat. Sc. Fhilad. i. p. 44. 



Rhinoptera quadriloba, Cm: Reqne An. : Fehmj, New York Faun. 



Fish. p. 375, pi. 66. fig. 217 ; BumSril, Elastnohr. p. 648. 



Disk more than twice as broad as long. Median notch of the 

 snout deep. Seven series of teeth in each jaw, those of the middle 

 upper scries about four times as broad as long. Tail a little longer 

 than the disk. 



Atlantic coasts of tlio United States. 



0. Rhinoptera adspersa. 



Mail. iS- Henle, p. 183 ; IJumeril, FJasmobr. p. (U8. 

 Upp(?r surface covered with minute stellate asperities. Teeth in 



