CHAP. XX.] FISHES. 461 



Family 101.— EHINODONTID^. (1 Genus, 1 Species.) 



" Sharks with two dorsal fins, the second small, and no nicti- 

 tating membrane." 



Distribution. — South and East Africa. 



Family 102.— NOTIDANID^. (I Genus, 4 Species.) 



" Sharks with one dorsal fin and no nictitating membrane." 



Distribution. — Temperate and tropical seas, from the North 

 Atlantic to the Cape of Good Hope and California. One species 

 has occurred on our southern coasts. 



Family 103.— SCYLLIID^. (7 Genera, 25 Species.) 



" Sharks with one dorsal fin and no nictitating membrane." 



Distribution.— AU temperate and tropical seas. Species of 

 Scyllium and Pristiurus are British. 



Family 104— CESTRACIONTID^. (1 Genus, 4 Species.) 



" Sharks with two dorsal fins and no nictitating membrane." 



Distribution. — Pacific Ocean from Japan to New Zealand, 

 Moluccan Sea. 



Family 105.— SPINACIDJE. (10 Genera, 21 Species.) 



" Sharks with two dorsal fins and no nictitating membrane, no 

 anal fin." 



Distribution. — Arctic, temperate, and tropical seas. Species 

 of Acanthias, Lcemargus, and Echinorhinus have occurred on our 

 coasts. 



