82 



LIST OF FISH 



M. De Blainville (Bull. Soc. Phil. 121, 1816, and Jour, de Phys. 

 262, 1816), divides the Rays (Raia) into eight sub-genera, thus: — 

 1. Dasybatus aut R. communis. — 2. Trigonobatus aut R. pasti- 

 nacffi. — 3. iEtobatus aut R. aquilse. — 4. Dicerobatus aut R. cornutaj. 

 — 5. Leiobatus aut R. lajvis. — R. cruciatus. — 6. Xarcobatus aut R. 

 torpedinus. — 7. Rhinobatus aut R. squali. — 8. Pristobatus aut R. 

 serratae. 



Cuvier (Regne Animal, 2 ed. ii. 394, 1829) divides these animals 

 thus : — 



I. Pristis. 



II. Raja, subdivided thus: — 1. Rhinobatus (* Rhynchobatus. 

 ** Rhinobatus, Midi, Sc Henle). — 2. Rhina. — 3. Torpedo. — 4. Raia. 

 — 5. Trygon. — 6. Anacanthus. — 7. Myliobatis. — 8. Rhinoptera. — 

 9. Cephaloptera. 



Miiller and Henle (Mag. Nat. Hist. 89, 1838) give the following 

 outline of their arrangement: — 



I. Pristis. — Which should be placed next the sharks, including 



1. Pristiophorus. — The branchial apertures on the side of the 

 neck before the pectoral-fins, which begin with a slender base as in 

 the sharks ; the fifth branchial opening close to the fourth, as in 

 many Scyllia ; teeth pointed. P. cirrhatus. 



2. Pristis. — The teeth pavement-like ; the branchial apertures on 

 the lower surface, as in other skates. 



II. Rhinobatis. — In two divisions and five genera, thus: — 



a. First dorsal-Jin opposite to the abdominal ones ; caudal-fin ending 



in two lobes ; mouth undulated. 



1. Rhina, Schneid. — The nasal-valves extending to the interior 

 corner of the nostrils ; body orbicular ; teeth round. 



2. Rhynchobatis, Miill. <Sc Henle. — The nasal-valve does not ex- 

 tend to the interior or corner of the mouth ; body oval, as in Rhiuo- 

 batus ; teeth broader than long, elliptical. 



b. The two dorsal-fins placed upon the tail ; extremity of the caudal-fin 



cut obliquely, forming only one lobe. 



3. Rhinobatus. — The nasal-valve like Rbynchobatis. 



