PALMOZOIC. 
CAMBRIAN. LOWER SIL. 
SSS aa = 
| |& A Selec 
a} .|3 SLsiFAlglsigiAlg|s 
Alslels| |s/SElslelZ 4/3) E13 |& 
SPECIES. 31SlalCl IStol Sia] Sls ls ial sia lg 
alEls|slwlelsials|s/slSlalelale 
B/E ale SISTA lsislelsi als 
nla BISl/alSlel.|/Slelsle|slals 
2) S/S] RP eS] Ss] Spec 12 )2] |b) acs 
FISISIS|S/A/SIAISIF IF IF IA lip ia 
Orthoceras (continued). 
— VAZANS........00.- QUES sv cceetevee eas (sa|\cr elles eine |e x |x 
— vaginatum ,..... SLCC 7 Casa peece ne [a5] a9] [ood [4 leas ileee dees | cea es 
— ventricosus ...... SHOPPE vicevere.|-ae| eee) cre|orefor sec| {4 leer food [acl esc 
— vertebrale ...... ISIN Soonpoeebeo"|(ae0||200|(o08) |to<) loci Fall S34 Rea] aod feel abel feed) aba) ee lenel ace 
VU ALUM, o00eer.. SOWs seesevaccass|=0+| ere] oee| ese eon) ooe]eee|eeefecel soe] os 
ORTHOCERATIDR. 
Phragmoceras ... Broderip, 1839 
Sow. Barr. &e. 
Oncoceras ...... Hall, 1846 ...... 
Gomphoceras .., Sowerby, 1839.. 
Poterioceras (part) M<Coy,1844 
Bolboceras ...... Fischer, 1844... 
Apioceras ...... Fischer, 1844... 
Phragmoceratites D’ Arch. de 
Vernewil ...... 
— approximatim M<Coy .........|,..|..2|.0-|eeefoee].o-] eee] eee ove] eee] eee 
—arcuatum ...... ISOCTH sonnnonesena| lasd| Meal oos||aool bac eeel{aod| Inert sal foe Boel faa * 
— Brateri ......... HTS “osobascsal laH kee [coe See ace laa, {local sae lane leioe 
— (GOMPressUMl 5. SOWs conan Aeertlacleeclscdlecd ace ane * % 
SS NESS ORY Ope TAO er ppoccpccaneg| {coe |oa5|looe| lace eal el [oot | badd fanallosel Saal [anal oor lecelfoes 
——IMLENMeC UM ant OGY cepeeess|er,|leeelteenl| icf oeel ee |eea lea weal lane * 
— nautileum ...... ISOwia two ceetaesen|eaalesdl ees eed est skal need eae * * 
— pyriforme ...... ISIE eropanoacecs| [soe lceel [collar ese edllecellone tec x * 
— subfusiforme .., Mimst. v.ccccise|coe| one) ore] ooePees|oes|o+]eee] eee 
— subpyriforme: 5. MIUNSt.) vesecease|eu|cealieee|leee)-2:|ecc|ace|(ose| eae |ese 
—— VENEMCOBUML 2. S010. cscshedeeaere|natl sen | eee eee fase P x * | & | x 
ORTHOCERATIDE. 
Piloceras............ Salter, 1858 ... 
— invaginatum ... Salt. ............/.../.2. Med. FE load lod ledel eoal aod los 
ORTHOCERATID®. 
Poterioceras ...... M ‘Coy, 1844... 
Gomphoceras ... Sowerby, 1839.. 
Apioceras ...... Fischer, 1844... 
126 
CEPHALOPODA. 
UPPER SILURIAN. 
CAMBRIAN AND SILURIAN. 
| Pass up. 
REFERENCES. 
Q. J. Geol. Soc. vol. v, t.6, f.6; ib. M‘Coy, Brit. Pal. Foss. 
App. A, p. vi, t.1 L, f. 28,29, and p. 318 in text; ib. 
Siluria, 4 ed. p. 200, Foss.42, f.1; ib. Mem. Geol. Surv. 
vol. iii, p. 356, t. 24, f. 1-5. 
Jahrb. vol. vii, p. 69, 1813; Petref. vol. i, p. 53; ib. 
Murch. Vern. and Keys, Geol. Russ. vol. ii, p. 349, t. 24, 
f.6; ib. Bronn, Leth. Suec. p.100, t.1, f.9; ib. Salt. 
Q. J. Geol. Soc. vol. vii, p. 377, t.10, f. 7. 
Creseis, Q. J. Geol. Soc. vol. ii, t.13, f. 3. 
Pal. New York, vol. i, p. 201, t. 43, f. 5. 
Vide O. angulatum, 
TETRABRANCHIATA. 
Vide Orthoceras. 
Sil. Syst. p. 621, 705, t. 10, f.1; var. t.11, f. 2: ib. Portl. 
Geol. Rept. p. 382, t. 28 A, f. 5; ib. Siluria, 4 ed. t. 31, 
f. 3. Gomp. subpyriforme, Miinst. Beitr. 3, p. 103, t. 20, 
f.10; ib. Geinitz, Verst. Grauw. p. 34, t. 7,8; ib. Portl. 
Geol. Rept. p. 381, t. 28, f.1. 
Vide Cyrtoceras inzequiseptum. 
Sil. Syst. p. 621, 705, t.11, f.2; ib. Portl. Geol. Rept. 
p. 382, t. 28 B, f. 2; ib. Siluria, 4 ed. t. 31, f. 4. 
Vide Cyrtoceras. 
Brit. Pal. Foss. p. 322; ib. Siluria, 4.ed. t. 30, £.4. PB: 
arcuatum, var. 8, Sil. Syst. t. 11, f.1. 
Sil. Syst. p. 622, 705, t. 10, f. 2,3; ib. Siluria, 4 ed. t. 31, 
f.1,2. ? P. ventricosum. 
Orthoceras, Sil. Syst. p. 620, 705, t.8, f. 19,20; ib. Siluria, 
4ed. t. 30, f.1-3. Ortho. ellipticwm, M‘Coy. Poterio. 
ellip. M‘Coy, Brit. Pal. Foss. p. 321. Gomphoceras, Sow. 
Vide Poterioceras approximatum. 
Vide Poterioceras approximatum, 
Sil. Syst. p. 621, 705, t.10, f. 4-6; ib, Siluria, 4 ed. t. 32. 
TETRABRANCHIATA, 
Q. J. Geol. Soe. vol. xv, p. 
376, t.13, £.17-21, woodcut, 
7 & Pp. 376. ; 
TETRABRANCHIATA, 
