CHEPHALOPODA. 
PALZOZOIC. 
CAMBRIAN. LOWER SIL. UPPER SILURIAN. 
ele We €/Ple sls lale lel: | & 
i) a i eee BIElZIEls 
2\(2|.| |. iSieReleersié 
SPECIES. elelels| (el elala eee ieieiela REFERENCES. 
ABH HERS cE GEeRe 
Hee BSeig eeSeeensik 
HSIRISISIRISIAIP FIFE IE IA Ip Ia |e 
Poterioceras (continued). TETRABRANCHIATA, 
— approximatum J/‘Coy ......... ped tooo lee sed [ooo allo [60] a0] [ona| [Pod lena) ono) |apo Synop. Sil. Foss. Ivel. p. 10, t.1, £.5. Ortho. subfusiforme, 
PP’ y NO} Pp f 
Miinst. (Gomphoceras), Beitr. 3, p. 103, t. 20, f. 6-10; 
ib. Portl. Geol. Rept. p, 381, t. 24, f.5. Gomphoceras 
subpyriforme, Portl. p. 381, t. 28 A, f.1. Phragmo. 
subfusiforme, P. pyriforme, P. subpyriforme, Geinitz, Die 
Verst. Grauw. p. 34, t. 7; t. 8, f.1-3. 
— llipticwm ......ssscersscneeceesseoes 558|[bo5|/se6) [cod |soal soo aoa lace sacl bine fsb) ons Vide Phragmoceras pyriforme. 
ORTHOCERATID®. 
Tretoceras ......... Salter, 1857 ... TETRABRANCHIATA. 
Diploceras ...... Conrad, 1842... 
— bisiphonatum .,. Sow. .........+.. sesfeee[ere[ensPersforeloee «| x Orthoceras, Sil. Syst. p. 642, t. 21, f. 23; ib. Siluria, 4 ed. 
i t. 11, £.5; ib. Salt. Q. J. Geol. Soc. vol. xiv, p.179, t.12, 
f.1-3. Diploceras, id. ib. vol. xii, p. 381. 
— semipartitum ... Sow. .....sseefefesefeeseePeee|eoefene|eeddees | P|...) |.l..| Orthoceras, Sil. Syst. p. 604, 705, t. 3, f..9. Tretoceras, 
Salt. Siluria, 4 ed. t. 34, f. 5. 
Trochoceras ......... FHrali, 1852 ...... 
— giganteus ...... SOW sae sxscaiees aes gagllacdl onal Ged lad) lace fesal iced laos Vide Lituites. 
NAvTILips. 
Trocholites......... Conrad, 1838... TETRABRANCHIATA 
Lituites (part) Breynius, 1732 
—ONGULOTINIS 5.5 ISDUL.) ceceasceenus||oee|voe|cas|ees|se>|[s+e)eeelees| ase Vide Lituites. 
— Hibernicus ...... SGU a estas cess: Rectloca! leet eed] [Sacllooa al 68 (ea6| sco! fas doa feel lesct leon joo Siluria, 2 ed. p. 220, Foss. 41, f. 3; ib. 4 ed. p. 200, 
Foss. 43, f. 3. 
——splanonbiforimzs COMPA -........|.-|.--|s2-|=«|-=|<-+|=2-|ee-)ese|s2e|see|oee|eeo|=2-|nn+|'oe0]eu~ Vide Lituites. 
127 
CAMBRIAN AND SILURIAN. 
