22. MYLIOBATID^ — RHINOPTERA. 51 



61. M. frcnaiiivillci Lc Suenr. 



Disk broader than long, tlie breadth equal to tlie length of the tail. 

 Skin entirely' smooth. A blunt, whitish i^romineuce over each eye. 

 Muzzle prominent. Teeth of the main row 4 to G times broader than 

 long: ; small teeth in three rows. Keddash brown. Tail nearly black. 

 Cape Cod to Brazil ; not uncommon. 



(Le Suevir, Journ. Ac. Nat. Sci. Pliila. iv, 111: Mijliohatis InspinoHus 'D\\n\6vi\, Hist. 

 Nat. Poiss. 637: Mi/liobaiis acuta StoreT, Hist. Fish. Mass. 245.) 



6S. 31. ca.Bafoil'BsiJ'.MS Gill. — California Sting Ray; Batfinh. 



Disk not quite twice as broad as long; the wings anteriorly convex, pos- 

 teriorly somewhat concave. Cephalic fin very blunt, nearly 4 times as 

 broad as long. Tail nearly twice as long as the disk. Ventral large, 

 broader than long. Lateral teeth in 3 to 5 series on each side; median 

 teeth only 3 to 4 times as broad as long, even in the adult. Skin wholly 

 smooth. Color dusky brownish, the young somewhat variegated. San 

 Francisco southward ; very common on the Pacific coast. 



{Rhinoptcra vespertilio Girard, Boston Journ. Nat. Hist. 18.')7, 544: Rolorhiniis vesper- 

 iUio Gill. Proc. Acad. Nat. Sci. Phila. 18(52, .3)51 (not Mijliohatis vespertilio Blecker); 

 Gill, Ann. Lye. Nat. Hist. N. Y. 1865, viii, 137.) 



43.— RHll^OPTEKA Kubl. 



Coiv-7Wse(l Eays. 



(Knlil, Miiller, Abliandhuigeu Ak. Wiss. Borl. 1836, 237: type Rhinoptera hrasiliensis 

 Miiller =: Mijliohatis jussieui Cuvier.) 



Disk broader than long, with the anterior angles more or less acute. 

 Snout more or less emarginate on the median line. Cephalic fin emar- 

 ginate and placed on a plane below the level of the pectorals, the snout 

 thus appearing four-lobed. Free border of the nasal valve not emar- 

 ginate. Teeth in 3 to 20 rows, the median teeth more or less enlarged, 

 but often smaller than in Myliohatifi. Tail long, whip-lilvc, with a small 

 dorsal fin and a serrated si^ine. Tropical seas. {f>h^ snout ; -reiw-^, fin.) 



60. R. qi3n<lrfllo1>a (Le Sueur) Cuvier. 



Disk one-third broader than long ; anterior borders almost straight, 

 posterior un<lulated ; muzzle deei)ly emarginate. Teeth in seven rows, 

 the median teeth four times as broad as long. Tail very slender, a lit- 

 tle longer than the disk. Skin smooth or nearly so. Color brownish. 

 Cape Cod to Florida ; not rare. Attains a large size. 



(Raia quadriloha Lc Sueur, Journ. Ac. Nat. Sci. i, 44; Giinthcr, viii, 494; Dumdril, 

 Hist. Nat. Poiss. i, 048. 



