33S CLASSIFICATION OP FISHES^ ETC. 



back ; no pectoral^ venti'al^ anal^ or caudal fins ; mouth 

 narrowj elongated^ the margms furnished with slender 

 filaments. 



Amph. lanceolatus. Yarrell, ii. 468. 



Petromyzon Linn. Body cylindrical ; eyes smaU ; 



branchial sphacles seven on each side. 

 Petromizon proper. Mouth circular^ armed with hard 



tooth-like processes in several rows. 



P. vaaxvaxiiS Linn. Yarrell, fluviatilis Linn. Yarrell, 



ii. 448. ii. 454. 



Heptatremus Dum. Teeth in two rows ; tail rounded 

 at the extremity, and terminated by a very narrow 



fin.* 



Ammocetes Dum. Lower lip straight and transverse; 

 teeth none. 



A. branchialis Dum. Yarrell, ii. 459. 



Myxixe Linn. Body cylindrical; eyes none; bran- 

 chial apertures two ; dorsal fin linear_, and very nar- 

 row ; lips surrounded with cirri. 



M. glutiiiosa Li7in. Bloch, pi. 413. 



Family 5. CYCLOPTERID^. Suckers. 



Cartilaginous ; without scales ; body slimy ; pectoral 

 fins very broad and miiting with a transverse membrane 

 connecting the ventrals ; branchial spiracle one ; eyes 

 on each side, approximating. 



Lepidogaster Gouan. Size smaU ; body rather slen- 

 der ; head heart-shaped, much depressed ; the ventral 

 membrane extends round the pelvis, forming a con- 

 cave disk, a second disk is placed behind ; dorsal fin 

 one, detached from the caudal, and of the same 

 length as the anal. 



L. comubicus YarreU. 



Piecephalus Raf. " Body conic-compressed ; pectoral 



* The characters of this supposed sub-genus are so slightly given in the 

 Regne Anmal, that, not having seen the original description, we scarcely 

 Tenture to adopt it. 



