18. RHINOBA-TIDiE — RHINOBATUS. 
37 
34.— PRISTIS La^.liam, 1794. 
Saiv -fishes . 
(Latham, Traus. Liiiu. Soc. ii, p. 27(5: type Squalus pristis L. =Pmti8 aniiquorv.m 
Latham.) 
The characters of the genus are included above. the ancient 
name of the saw-fish, from -piarrj-, a sawyer.) 
44. P. antiqaioruiii L.atham. — Saw-fish. 
Anterior dorsal opposite ventrals; candal tin without lower lobe 5 ro.s- 
tral teeth in 10 to 20 pairs, nearly equidistant, stout, provided with a 
cutting anterior edge ; the size of the teetli subject to considerable varia- 
tions; caudal hn without lower lobe ; color grayish. Length 10 to 15 feet. 
Atlantic Ocean ; common on both shores, especially southward ; probably 
entering rivers. 
{Squalus qmstis, L. Syst. Naturss : Pristis antiqu«rum Lath.am, Trans. Linn. Soc. 1794, 
ii, 297 ; Giinther, viii, 438.) 
Family XVIII —RHINOBATIDyE 
[The Long-nosed Bays.) 
Shark-like rays. Trunk gradually passing into the long and strong 
tail, which is provided with two well-developed dorsal fins, a caudal fin 
and a conspicuous dermal fold on each side ; disk not broad, the rayed 
portion of the pectoral fins not being continued to the snout ; no conspic- 
uous spines, the skin being iiearlj- smooth ; no electric organs. Genera 
3 to 5 ; species about 15 ; inhabiting warm sqas. The form of the body 
is as much shark-like as is that of the shark Squatina. [Bhinohatidce Giiii- 
ther, viii, 440-448.) 
* First dorsal much behind the ventrals ; anterior nasal v.alves not continent. 
RniNOBATUS, 3.5. 
35.— RHIIVOBATIJS Bloch & Schneider, 1801. 
(Schneider ed. Bloch, Ichthy. : type lUduohuius rhiuohatus Bloch A Schncider=R/(i/io- 
hatus (jranulutus Cnv.) 
Body depressed, gradually passing into the tail. Cranial cartilage 
produced into a long rostral process, the space between tlie process and 
the pectoral fin being filled by membrane. Siiiracles wide, behind the 
eye; nostrils oblique, wide ; anterior valves not conllnent. Teeth ob- 
tuse, with an indistinct transverse ridge. Dorsal fins without spine ; 
both at a great distance behind the ventral fins. Caudal fin without 
lower lobe, [fiv-q., a shark, Squathia; /Saroc, a skate.) 
