136 LIST OF FISH. 



Section D. CYCLOSTOMIA. 



Gills saccate ; body elongate ; pectoral and ventral-fins none. 



Cyclostomia, Rafin. Anal. Nat. 94, 1815. 



Cyclostomes, Blaine. Bull. Soc. Phil. 1816, 120. Jour, de Phys. 



1816, 254. 

 Cyclostomata, Mull. Abhandl. AJcad. Wissensch. Berlin, 1834, 65. 



Mag. Zool. $■ Bat. i. 406, 1836. 

 Sub-class 4. Marsipobranchii, Bonap. Syst. Ichth. 1838, 14. 

 Cyclostomi, Helminthoidei, Petromyzonidae, Bonap. Syst. Ichth. 



1838, 14. 

 Petromyzida?, Gray, Syn. B. M. 1842, 148, 150. 

 Lampetrae, Ray, Syn. Pise. 35. 



Dumeril (Zoologie Analytique, 8vo. 1806, p. 101) divides the 

 Cyclostomes thus : — 



1. Petromyzon, with seven branchial holes. 



2. Gastrobranchus, with only two branchial holes. 



Fain. 1. PETROMYZONID.E. 



Nasal aperture closed, and the palate entirely covered with skin. 



Lampredia, Rafin. Anal. Nat. 94, 1818. 



Petroir.yzonidffi (Petromyzonini), Bonap. Syst. Ichth. 1838. De 



Kay, Nat. Hist, of Neiv York, 379. 

 (Fam.) Hvperoartia, Mull. Abhandl. Akad. Berlin, 1836, 77. May. 



Zool. §• Bot. i. 406. 

 Petromyzida?, Gray, Syn. B. M. 1842, 148, 150. 



Rafinesque names, but does not characterize, the genera Lam- 

 preda and Pricus, (Anal. Nat. 94, 1815). 



Muller (Abhandl. Akad. Berlin) divided the genera thus: — 



1. Pteromyzon, with visible teeth. 



2. Ammoccetes, without visible teeth. 



