1936] Schultc: Keys to Fishes 131 



Family 4. Scylliorhinidae. Cat Sharks 



Range: Puget Sound to Gulf of California. Marine. Not rare. 



Brown Shark. Cat Shark 8. Apristurus brunncus (Gilbert) 



Family 5. Carchariidae. Gray Sharks 



Range : Warm seas. Marine. Rare northward. 



Great Blue Shark. Fig. 2 9. Prionace glauca (Linnaeus) 



Family 6. Galeorhinidae. Oil Shark. Soup-fin Shark 



Range: British Columbia to Lower California. Marine. Rare northward. 

 Soup-fin Shark 10. Galeorhinus zyopterus Jordan and Gilbert 



Family 7. Alopiidae. Thresher Sharks 



Range : Mediterranean Sea, Atlantic and Pacific Oceans. Marine, Not rare. 

 Fox Shark. Long-tailed Shark. 11. Alopias vulpinus (Bonnaterre) 



Family 8. Lamnidae. Mackerel Sharks 



Range: North Atlantic and North Pacific. Marine. Common northward. 

 Salmon Shark. Tiger Shark 12. Lamm nasus (Bonnaterre) 



Family 9. Cetorhinidae. Basking Sharks 



Range: Arctic seas southward to California, Virginia, and Portugal. Ma- 

 rine. Common northward. 



Basking Shark. Elephant Shark. Bone Shark.. . .13. Cetorhinus 



maximus (Gunner) 



Family 10. Squalidae. Dogfish Sharks 



Range : Aleutian Islands to Santa Barbara. Marine. Abundant. 



Grayfish. Dogfish Sharks 14. Squalus suckleyi (Girard) 



Family 11. Somniosidae (=Dalatiidae). Sleeper Sharks 



Range : North Atlantic and North Pacific south to San Francisco. Marine. 

 Common. 

 Sleeper Shark.. 15. Somniosus microcephalia (Bloch and Schneider) 



Family 12. Squatinidae. Angel Sharks 



Range : South eastern Alaska and southward. Marine. Rare northward. 



Angel Shark. Fig. 5 16. Squatina calif omica Ayres 



Family 13. Rajidae. Skates and Rays 



dy at each side of the snout convex or stra 

 nout to outer tip of pectoral angle passing 

 disk. Fig. 4. 



2a. Outline of body undulating, first convex and then concave. 



la. Outline of body at each side of the snout convex or straight ; a line drawn 

 from tip of snout to outer tip of pectoral angle passing everywhere inside 

 of outline of disk. Fig. 4. 



