PALAOZOIC. 
GASTEROPODA. 
CAMBRIAN AND SILURIAN. 
CAMBRIAN. LOWER SIL. UPPER SILURIAN. 
gf Alley SSI oll all o|ESI) ollie 
=e] | & SEs lelel ale siel3 
2|.[2|.| | SERB ERsl2 
SPECIES. slelalel(Slsialalsieisialeiaisls REFERENCES. 
BESS MS SiAlsslSislelelealsl= 
a || SELES lEISlSlelslelelSizle 
a} /.8 HIS \a a iS Be) ls 
BISISEISISIS HP EIFIEIS ISD IBIS 
Helicotoma ......... Salter, 1856 ...|.0-|..0]...[emfree|ee.[eeeleorPaee Vide Ophileta. 
HALIoOTIDm. HOLOSTOMATA. 
Holopea* ...,..... Hall, 1842...... * The genera Holopea, Holopella, Cyclonema, &e. are so 
closely allied that it is difficult to separate them. 
— carinata ........ TAN RIED papactooo\ con o04 (G00 aoe] aod FE food faoa| facalfoce ai MSS. Salt. Mem. Geol. Surv. vol. iii, p. 348, woodeut, p. 347, 
No. 14, f. 4. 
— concinna ...,..... ME CO vactadaea tee (va) es| cea veil eo | ee [eee Vaticopsis, Synop. Sil. Foss. Irel. p. 13, t.1, f.10. Holopea, 
Siluria, 4 ed. p.197, Foss. 40, f. 5. 
— CONICA ........00e MOP GGT Hira ccteccll ete lineal santtseabeie lees © \Ieod [oa8| jaac| ees ison MSS. Salt. Mem. Geol. Sury. vol. iii, p. 347, woodeut, No. 14, 
ie ize 
— constricta ...... PEO). -rcioo8soa| oce| (eco lecs| ood etl ace Pallood |seclleos Trochus, Brit. Pal. Foss. p. 296, t.1 K, f. 41. 
— eXS€rta...,....000- HOT DES eva se secu) "es| (eee tecel Sec le | sae * MSS. Salt. Mem. Geol. Surv. vol. iii, p. 347, woodcut, No. 14, 
Tne 
— lymneoides...... HOROES oie. scae rlleeea| Sell ce lewcl se food fred! bso] {ocd tena MSS. Salt. Mem, Geol. Surv. vol. iii, p. 347, woodcut, No, 14, 
tis 3 
— striatella......... OWS cocencte teed Mas |lecal eeslees ead sen Billed etttaweallnee Litorina, Sil. Syst. p. 612, t.19, f.12. Holopea, Siluria, 
ged. t. 7, f.4. TZrochus constrietus, M‘Coy, Brit. Pal. 
Foss. p. 296, t.1 K, f. 41. 
TURRITELLID®. 
Holopella ........ , M‘Coy, 1852... 
, iy HOLOSTOMATA, 
Purriteula (Part) v.cccriscresereees 
— cancellata ...,., ISCOTEES Seerodsoatdoo| (dae lsod| lose aad (sae Bde xl «lx [Px Turritella, Sil. Syst. p, 642, 706, t. 20, f.18. Murchisonia 
polyglypha, Phill. Mem. Geol. Surv. vol. ii, pt.1, p. 357; 
t.14, f. 3. Holopella, Siluria, 4 ed. t.10, f.14, p. go, 
Foss. 15, f. 8. 
Sa COMICA aan acredart IS{E2S. Gasootacnbea| ice loot loael ced [Bes * * * Turritella, Sil. Syst. p. 604-706, t. 3, f. 7,8. Holopella, 
Siluria, 4 ed. t. 34, f.10, t. 35, £. 26. 
— gracilior ......... AEX OW) ercsrccca| (eee lace loce| loce| keee| one face) fooe laxe| pot * * Brit. Pal. Foss. p. 303, t.1 K, f. 33. 
= SETCRATIA mneeenecs PSIOTEES eee pee REC |e lect] (ee! Ibe] Iaeal aa [evel aod [sae see IRB loa x x Turritella, Sil. Syst. p. 603, t. 3, f.1. Holopella, Siluria, 
4ed. t, 34, f.10; ib. M‘Coy, Brit. Pal. Foss. p. 303. 
— intermedia ...... RASTA Reason nec eel Seb) seed Reel laeel teal (Reel onc Hes * Brit. Pal. Foss. p. 304, t.1 L, f.16. 
— monile,........... WORT) Recnereid| bas nen local bod eel lose al Ebel Ina loodl esol fase Brit. Pal. Foss. p. 304, t.1 K, f. 32. 
mlaseleea|ces| bee x * x Turritella, Sil. Syst. p. 603, 706, t. 3, f.7. Holopella, 
Siluria, 4 ed. t. 9, f. 28; t. 10, f.14, t. 34, f.11. 
— plana s...cecceee WHOL ceetione| (coal aad) |Geq| (Gad [eal opal nccloce x |. Turritella, Synop. Sil. Foss. Irel. p. 12, t.1, £. 6. 
— tenuicincta ,..... MC OW esccecen alte lees lecal nea lioce xl a] x Brit. Pal. Foss. t.1 L, £.17. 
Hormotoma ......... FIT heey one OOD eee (Gea (eee ace ee [Ber] (58 ce lod face lee face Vide Murchisonia, 
LItoRINIDE. 
eae HOLOSTOMATA. 
LALOTUNG. Waceeeneten Ferrusac, 1821 
— Coralia .......:. IS) Ee cope cserel aan [ba tecel ere] Ketel Patel Hest Gee Peat lore Van 
— OCtWViA ..iicese DU AS OL) mA aera forse Race) (ase kev Fecal stele cea eck Fel [stale lees esl eel oe Vide Cyclonema. 
= undiferd cece. 5 AED ee Pome els eel Peel et bead teh 
PYRAMIDELLID®. 
HOLOSTOMATA, 
Loxonema ......,.. Phillips, 1841.. 
— elegans ......... JAD repented |ea| ed local loan, 300 [enc 222] [ood [eel foor: * * Brit. Pal. Foss. p. 302, t.1 K, f. 34. 
— ObSCUA icseeiee IZOREL:(setate cue veael| vee reales lace hese lees lee lee ee Vide Murchisonia. 
— BINUOSA .....050 SWS” pcesceooo00d [ped] [ner [ebal ood ooo (sacl sacl fosc * A fealie ale Terebra, Sil. Syst. p. 619, t. 8, f.15. Loxonema, Siluria, 
4ed, t. 24, £. 3. 
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