FISHES. 387 



53. Sii-URus. Skin naked. Dorsal fin radiated. The 

 following subgenera are indicated by Cuvier : 1. Silurus 

 (S. glanis). 2. Mystus {S. mystus). 3. Synodontis {S. 

 clarias). 4. Pimelodes (S. nodosus). 5. Bagrus {S. hagre). 

 6. Ageneiro&us {S. militaris). 7. Doras {S. costatus) 

 8. Heterobranchus {S. angidllaiis). 9. Plotosus {Platys- 

 tachus an^uillaris of Block.). 10. Callichtys (*S'. col- 

 liddys). 



54. Malapterukus. One fleshy dorsal fin placed near 

 the tail. With elecrical organs. S. electrkus, Lin. 



55. Platystacus. Bones of the operculum ossified and 

 fixed. Silurus asprido, L. 



56. Loricaria. Mouth with a ventral aspect. Body 

 mailed. 1. Hypostomus (L. plecostomus). 2. Loricaria 

 (L. cataphracta). 



(2). Ventral fins thoracic or jugular. 



a. Sides of the body similar. An eye on each side. 



(aa.) Furnished with a sucker. 



(L) Sucker thoracic. 



57. Lepadogaster, Sucker double. L. ocellatus and 

 bimacidatus of Donovan *, are natives of Britain. 



58. Cyclopterus. Sucker single. This genus has 

 been subdivided into, 1. Cyclopterus, having the body fur- 

 nished with ridges of tubercles, as C. lumpus ; and, 2, Le- 

 paris, having the body smooth, as L. vulgaris and Mmi- 

 tagui. 



(IL) Sucker coronal. 



59- EcHENEis. Sucker in the fonn of an oval disc on 

 the head, with transverse folds. E. remora. 



• « The Natural History of British Fishes," 5 vols. 8vo. London, 1808, 

 The figures are in general accurate, 



Bb2 



