122 



University of Washington Publications in Biology 



IVol. 2. 



56b. Dorsal and anal not followed by finlets. 



58a. Vomer with teeth. Fig. 18. 



59a. Dorsal fin, without pungent spines, continuous (un- 

 notched) ; dorsal fin not beginning on head; caudal 

 rounded or truncate. 



60a. Lateral line running high, not far from the dorsal 

 fin base and not reaching the caudal fin (lateral 

 line incomplete). 

 Ronquils 76. Bathymasteridae, p. 191 



60b. Lateral line if present not high on back, but reach- 

 ing to caudal fin. 

 Ragfishes 56. Icosteidae, p. 161 



'eSo 



>D4K 



Fiq.17 



F19.I8 



Fig. 16. The ventral side of the goby, Rhinogobiops nicholsii, showing the modification 

 of the pelvic fins into the sucker. Ve Su — ventral or pelvic fins modified into the sucking 

 disk. Drawn by Arthur D. Welander. 



Fig. 17. A diagram of the ventral side of a sea snail, Liparididae, showing the mod- 

 ification of the pelvic fins into a sucking disk. Ddk — width or diameter of the disk. 



Fig. 18. A diagram to show the approximate positions of the teeth bearing bones in 

 the roof of the mouth of many fishes. Max — maxillary; Pal — palatine; Prem — premaxil- 

 lary; Vo — vomer. 



Fig. 19. The fringe-like "teeth" of the Sandfish, Trichodon trichodon. Fr — fringes 

 of lips (not true teeth). 



