1936] 



Schidts: Keys to Fishes 



113 



12b. Dorsal fins without spines. 



Sleeper Sharks 11. Somniosidae, p. 131 



4b. Gill openings wholly on lower side of body or in a deep notch at the 

 "neck" ; body much depressed. Figs. 4 and 5. 



13a. Spiracles less than Vz length of snout behind the eyes, usually almost 

 bordering on the eyes ; snout longer than interorbital space. 



Fig. 4. The ventral side of a male skate, 

 Raja binoculata, showing the position of the 

 mouth, gill clefts, and the pelvic fins with- 

 out the notch. A — anus; Cla — clasper; GC 

 — gill clefts; Mo — mouth; PF — pelvic or 

 ventral fins; Ros — Rostral cartilage. Drawn 

 by A. D. Welander. 



Fig. 5. A sketch of an Angel Shark 

 showing the gill openings in the "neck." 

 After Starks. 



14a. Disk very broad and circular anteriorly; no spines or prickles 

 anywhere; dorsal fins 2, the 1st dorsal anterior to the posterior 

 tips of pelvics ; jelly-like electric gland present at base of pec- 

 torals on dorsal side. 



Electric Rays 14. Torpedinidae, p. 132 



14b. Disk not evenly circular anteriorly ; spines and prickles present ; 

 origin of dorsal fin far back of tips of pelvic fins (claspers are 

 not fins) ; no electric gland is developed. 

 Skates and Rays 13. Rajidae, p. 131 



13b. Spiracles from z / 2 to Y<\ length of snout behind the eyes ; interorbital 

 space longer than the snout; origin of 1st dorsal at extreme pos- 

 terior tips of pelvic fins. Fig. 5. 

 Angel Shark 12. Squatinidae, p. 131 



