ALOPIIDA. — VIII. 17 
10. CARCHARHINUS Blainville. (Carcharias Cuvier.) 
(xdpxapos, rough ; pivy, shark.) 
(The largest genus of sharks, represented in most warm seas. 
It is often divided into several genera, but intergradations make 
it difficult to maintain these divisions. In young specimens the 
serration of the teeth is not evident.) 
a. First dorsal far behind pectoral, nearer root of ventral than that of pec- 
toral. (Carcharhinus.) 
13. C. glaucus (L.). GreAT BLuE SHark. Snout very long; 
color grayish blue. A large shark, rare on our coast. (Hu.) 
(Lat., grayish blue.) 
aa. First dorsal not far behind pectoral. 
b. Upper teeth oblique; deeply notched on outer margin. (Platypodon 
Gill.) 
14. C. obscurus (Le Sueur). Pectorals large; second dorsal 
evidently smaller than anal; first dorsal large; head pointed. 
L. 10 feet. N. Atl. Frequently on our coast. 
6b. Upper teeth sub-erect, triangular, scarcely notched at outer margin. 
(Eulamia Gill.) 
15. C. caudatus (Dekay). Snout moderate, its length from 
mouth forward not less than width of mouth; pectoral fin not very 
long. Atlantic coast: a little known species of uncertain synon- 
ymy. (Lat., long-tailed.) 
11. SCOLIODON Miiller & Henle. 
(cxodtds, oblique; ddav, tooth.) 
16. S. terree-nove (Richardson). SHarpr-NosED SHARK. 
Body slender; snout depressed ; mouth with short labial grooves 
on both jaws; second dorsal smaller than anal; gray, tail dusky- 
edged. West Indies, N. to Cape Cod, common S. (erroneously 
ascribed to Newfoundland). (Lat. terra, land; nova, new. New- 
foundland.) 
Famity VIII. ALOPIIDAS. (Tue Turesner SHarks.) 
Body rather slender; snout short; teeth equal, flat, triangular, 
entire; gill openings moderate, the last above P.; no nictitating 
membrane ; spiracles obsolete; first dorsal large, second dorsal and 
anal very small; tail about as long as rest of body ; no caudal keel; 
pectorals falcate, very large. One species, a large shark, found in 
most warm seas, 
12. ALOPIAS Rafinesque. (adazmné, a fox.) 
17. A. vulpes (Gmelin). THrREsHER. SwiNnGLE-TarL. Fox 
SHark. Color gray. L. about 20 feet. Open sea; occasionally 
on our coast. (Eu.) 
2 
