PALMOZOIC. 
CAMBRIAN. LOWER SIL. 
GASTEROPODA. 
CAMBRIAN AND SILURIAN. 
UPPER SILURIAN. 
oo Fr * 7 7 
=| |& elElElE rele (SEIS |g 
a| | Als elle |elslals|3 
Aldials! |oislelslel@Fis/ sie 
SPECIES. elSlelS! Isl olSlS| EMS MIRIBIAlal 
AlElslslwrsisiaisis(Sslslelelels|s 
8 SISOS IT IAs ls lalolelale 
BlSIPISIEIBIELEaIS(SElEIEEl2 | 2 
nm BIS Sle So) me) lr 
HIS ISISI4 IBIS IAD IF IE IE IIS Ib Ie |e 
Euomphalus (continued). 
Schizostoma ... Bronn, 1835... 
Straparollus ... Montf. 1810 ... 
Ophileta ........ Vanuxem, 1843 
Platyschisma ... M‘Coy, 1844... 
— alatus ............ T2 EES eon ssiceiod| (cad ae) bal leas) [onal fone xe [eee] & |e |e | x 
— carinatus......... ISTO peeeecosceed) Ac Ince fnelieee| asl aod Ineo! aed] {ean > x le |e 
ES COMUMLU PU cae LAI laveneseley cae sex |e | nee see | aac | cam |sue] @oaploes| sae sas P| x |. 
— corndensis ...... [Saves - Reonescodods| asc\ con soo! food fool be-|] {ne level local loen! loco! sch lapol aos 
=" CISCOIS Hs. cnness<es NT cgasoaconssol cod local bast \aad) eel aes Iahallaodt Sa «| *|> 
— funatus ......... BOs. i avsac cesses |eea| see |eos| ses sea|eeeliae ae tel eee se Pel nal leer acd 
— furcatus ......... AATCC Sonconcc3||aod [bool {s6| 1906) [aaa] dod lone fo09) Ine fecal sca ood 
— granulatus ...... SITES. “Cenccesca ond |oe8| |co8| eee] eel eon! |) (ee est focnl loool |ebal jose lool [ona 
==> IRIE SHE) Genecansdie! 47 aaaoecieds60d (ocal lose) lana sae) face leao|| <3 lead) [aed lonol aco! leon 
== (WETS paccenone CUI OLR TE Choopoceal lech eed! leao| sod joa] cual loce|/and Beal lace 
LAU GUS ares cicccet OO) foccvatteen nce|asa| ese |lescP norailisee| see's es k 
SS TAME Goneog PERN cepennecoondl san lacdl loodl oe] focell =2| logal led) acolIbsal leet [oon 
— parvus............ TRF be redpeennce8d po5| oe joe) 09) oct | beallaad [scot locol|oeal bei9) [00] local lasallood 
— perturbatus ISWXDS - potasonebecbI Inca lace! lncel soe [anal a6o]|ae6}{nac [ecol lScallece| fans 
— prenuntius...... | GA Sos 38080005) soe [eee lece| face) (aol |coal Ines face x |- 
— qualteriatus ISAAK 7 7S sce paper | eed lace [ab] eed col Rf lecel eed [Scel loo8| jaca) [oct 
— rugosus ......... fe CE SOCROGEBROA! ed loeel Biel aed) (sod) (bod laa laced lscel load celle |e. 
— sculptus ......... ISCXEES Geocnncoocea| ad laca Iced leek laos) [eel «| «| «|x 
= BOUTS renpeapeecondaccssaccons| lod [eed deel aed jase jaca) add) see) joel Ieee lee laa joedl Iooa Ieos 
— subsulcatus...... TET SepspesqconA| becl Ino Ihbal [sed cot lode [3] food }aa6| baa ooat leoe 
| 
—— subcarinatus .., Wdmst. ......c0-|leoc| os )ee|esefcoe|«-o|e-0] eos * |. 
= LMMULSETUGEUS) a2 (NOW, eaccecessase|ece|cee | eal nef neal ee | eee <( cen online| os 
— tricinctus ...... DOR, Secs) (ose feed] ood ace [o5d| [eo [boa lad) lao5}{009| [ose laa seo] aa fase 
— triporcata ...... MS Cou). oisseaaattena|pes| oes! | ed ee ace soe] all see'||- oan | com 
— tubeformis...... EBAY eines es eece| ese vee nes| eed iaes |e lhoki |e==] s<= 
Helminthochiton Salter, 1846 ... 
REFERENCES. 
HOLOSTOMATA. 
Leth. Suec. p. 36, t.11, f. 7; ib. Sow. Sil. Syst. t. 13, f. 28, 
p. 631. Var. subundulatus, Salt. Mem. Geol. Sury. vol. ii, 
pt. 1, t.14, £.8, 10. Euomphalus, Siluria, 4 ed. t. 25, 
f. 4. 
Sil. Syst. t.6, f.10 ib. Siluria, 4 ed. t. 24, f. 11. 
Turbinites, Upsal, vol. viii, p. 71. Helicites, His. Anteckn. 
4, p. 259, t.6, f.2. Euomph. id. ib. vol.v, t.1, f.d. 
Inachus sulcatus, His. Leth. Suec. p. 38, t.12, f.1.  E. 
centrifugus, M‘Coy, Brit. Pal. Foss. p. 297. 
Sil. Syst. p. 641, t. 22, £.16; ib. Siluria, 4 ed. t. 7, f. 5. 
Min. Con. vol. i, p. 113, t. 52, f.1; Sil. Syst. p. 626, t.12, 
£.18; ib. Siluria, 4 ed. t. 24, f. 12. 
Min. Con. vol. v, p. 71, t. 450, f.1,2; Sil. Syst. p. 626, 
t.12, f. 20; ib. His. Leth. Suec. 1, p. 37, t. 11, f£.11. 
Vide Bellerophon perturbatus. 
Beitr. 3, p. 86, t. 15, f. 10, 1840; ib. Portl. Geol. Rept. 
p- 410, t. 30, f. 5. 
Geol. Rept. p. 410, t. 30, f. 6. 
? B. granulatus, Miinst. 
Vide Trochonema. 
Synop. Sil. Foss. p.14, t.1, f. 12. 
Pal. New York, vol. i, t. 3, f. 3; ib. Salt. Q. J. Geol. Soc. 
vol. xv, p. 379. 
Geol. Rept. p. 411, t. 34, f.1. 
Vide Bellerophon perturbatus. 
Mem. Geol. Surv. vol. ii, pt.1, p. 357, t.14, f. 11. 
Helic. Nachtr. t. 11, f. 3; ib. Goldf. Pet. Germ. t. 189, f. 3. 
Euom. pseudo-qualteriatus, V. Buch, Karst. Arch. p, 156- 
8; ib. His. Leth. Suec. t. 11, f.5; Phill. Mem. Geol. 
Surv. vol. ii, pt. 1, p. 356, t.14, f. 7. 
Min. Con. vol. i, p. 113, t. 52, f. 2; ib. Sil. Syst. p. 626, 
t.12, f.19. HHelicites catenulatus, Wahl. Delphinula and 
Euomphalus catenulatus, His. E. rugosus, Siluria, 4 ed. 
t. 24, £.13. 
Sil. Syst. p. 626, t.12, f.17: ib. Siluria, 4 ed. t. 9, f. 27; 
t. 25, f. 2: ib. Portl. Geol. Report, p. 410, t. 30, f. 2. 
Vide E. alatus. 
Leth. Suec. p. 37, t-11, f.10; ib. Portl. Geol. Rept. p. 409, 
t. 30, f. 3. Trochus furcatus, Baily, Mem. Geol. Surv. 
Trel. Expl. sheet, 35 N.E. p. 9, f. 4a, b. 
Bair. 105; Beitr. zur Petref. heft 3, p. 85, t.15, f.53 ib. 
M‘Coy, Synop. Sil. Foss. Irel. p14. Delphinula, His. 
Anteckn. 5, t.1, f.b, t. 8. 
Vide Bellerophon perturbatus, 
Vide Trochonema. 
Vide Trochonema. 
Mem. Geol. Surv. Irel. Expl. sheet 35, p.10, f. 6a, b. 
I1Sti 
