PALEOZOIC. 



CEPHALOPODA. 



CAMBRIAN AND SILURIAN. 



CAMBEIAir. lOWEE SIL. 



UPPEE SILUEIAN. 



SPECIES. 



Poterioeeras (continued). 

 — approximatam M'Coy 



elliptictim 



OETHOCEEATIDi;. 



Tretooeras Salter, 1857 



Diploceras Conrad, 1S42... 



— bisiphonatmn... Sow 



— seniipartitiim ... Sow. 



fn 



M 'S - H 



Trochoceras Hall, 1852 . 



Sow 



Nautilid^. 



Trocholites Conrad, 1838.. 



IMuites {part) Breynius, 1732 



— anguiformis ... Salt 



— HibemicTis Salt 



— planorliformis Conrad 



Ml^ 



< 5 '5 4 



REFEEENCES. 



TETEABEAN CHIATA . 



Sjnop. Sil. Foss. Irel. p. 10, 1. 1, f. 5. Ortho.subfumforme, 

 Mtost. (Gomphoceras), Beitr. 3, p. 103, t. 20, f . 6-10 j 

 il). Portl. Geol. Eept. p. 381, t. 24, f. 5. Gomphoceras 

 snbpyriforme, Portl. p. 381, t. 28 A, f. i. Thragmo. 

 subfasiforme, F.pyriforme, P. subpyriforme, Geinitz, Die 

 Verst. Grauw. p. 34, t. 7 ; t. 8, f . 1-3. 



Vide Pbragmoceras pyriforme. 



TETRABKANCHIATA. 



Orthoceras, Sil. Svst. p. 642, t. 21, f. 23; ib. Silnria, 4ed. 

 t. II, f.5; ib. Salt. Q. J. Geol. Soc. vol.xiv, p. 179, t.12, 

 f. 1-3. Diploceras, id. ib. tol. xii, p. 381. 



Orthoceras, Sil. Syst. p. 604, 705, t. 3, f. 9. Tretoceras, 

 Salt. Siluria, 4 ed. t. 34, f. 5. 



Vide Lituites. 



TETEABRANCHIATA. 



Tide Litnitcs. 



SUmia, 2 ed. p. 

 Foss. 43, f. 3. 



Vide Lituites. 



s. 41, f. 3; ib. 4 ed. p. 200, 



127 



