TABLE OF GENERA. xlv 



CAMBRIAN. SILURIAN. 


ill Group. 
| 
Lower Bala. 
| Middle Bala, 
Upper Bala 
Lower Wenlock. 
Wenlock Group. 
Lower Ludlow, 
Upper aa 
Downton Sand- 
stone 
Ledbury Shales. 
Menevian. 
Tremadoce, 
| Lower Cambrian. 
May H 
| Ffestiniog. 
| Arenig Group. 







Brachiopoda (continued) 
Atrypa Se ae 05 |! 300, jf aoahl) 6c: |I/'00| |I\2sc0: |fsace 
Triplesia aes 6 Sac || c00 I) S504) adao! |f voas. |] Spo | loot 
Rhynchonella ... a 
Pentamerus ... nee Seoailieteese |) wash |) cap. [etomidate ll overs 
Porambonites ... oe Bele ie ager laacicioed hartayoal Morse dl hatescall uae 
Meristella wa ae Pe cre | reuiche | ec atl linteneaeellemetcrchll| cateeoe ll Saieteg ||) eae * 
Obolus sine ee Be || teiaret, | eka | eters lh creepy liberi atwod It weed lL eres x foo 
* 
* 
* 
He 
* 
* 
* 

* KK KX 
* 
* * 
* 
* * 
* 
Spirifer ane 500 pos) Soe Nene) ae olf eed “| ade fllStowe: ol [dea p|| “oc * 
Chonetes ax ie eel SER Uses fe hae RS Bala al cep hae (eee, Bl baa * 
Athyris See Rae SH cee RBS al soll acer limoce dllikeee ol ieee oaG vee | ok 
Retzia wae cee Boe Aceal| Mecca Pecerallt- ceed liecog illeeoe flesooell aces coe |g 
Eichwaldia ... Mt moe I Nseceewll Perel cater ie mered ecsected ll mike Teretecoih lh caves coe | cee 
Nucleospira... 50% 066. Ihde 4h aoe! || dee |) cae ||) coo || ce ||)!onm ||!ea0 see | ones 
Lamellibranchiata 
Paleearca oe 00 soca 'l| Reco elece |siace eck ll gob loc 
Ctenodonta ... 906 Secale ers al lence | piers al ecg ee alleen 
Pterinea 500 20 Seen | debe ane, lester eben tlleeee tl ee 
Modiolopsis... ae cies le Saal ESR acai fecseee Il sed esac 
* 
x 
* 
Lyrodesma ... ach ating || 40h ooo Alieee Mhided MMe dpe Iles dl =noc * 
* 
* 
* 
* * Ke KK KK * 
* 

* * OK * 

Cleidophorus ... ste SEP fn Octet | ee eee Ol leeeeen lheeste, beer 
Orthonotus... a Pen see cart fl ema Tie tes 3 | eekene tbc 
Cuculella oe Bs aisle || Messak| eettene| bac t alle patecoadl scrote le ares 
Mytilus sae a0 Bem liccsesl| oa las ||ecoel| ReceuillMases | hesese lltede Fi || 9 || oao || coo. |! 
Nuculites ts nee Reel loses Al Gace /Paeal Weise ntocell oe |lecken| laciad Son || 
Cardiola aa bho Sel | ate | eee gael ecreee | seeseied ees sreadl Betcre Ml fulsiers cael cae 
Ambonychia ... 556 aerallacde || coor ||)oe0 {kabel |) coc |edosel| aa. fee see | woe 
Pseudaxinus ... nae Ber (eee llncisse || “ss SeRel lace lide ee Meson | eter leet p00 || ood 
Pleurorhynechus wee asia | ecenallatetetall cress Nrerrcis, eters, Ml since ll wae: J|iarere vee [aes 
Goniophora... aide SUG lone || “sont (voce |) cane Pecan ac. Wenac. (aon see | eee 
Grammysia_... Pp RPE Wit dep |cioa al oder | ocaw||eaarenl besen |) seca |eeior 5a || ove 
Lunulacardium ae SE aecaic pees eae esc | aeeayeed llitevresh ll Pecaree alison pas" || aoc 
Anodontopsis ... Fae Aran eestor cael -aereen| Ik Bete | Reem (ee eres leocic Con lesoe Ml eacralliers |e 
Gasteropoda | 
Murchisonia ... ane sEfeh ll antes a) [aeeeerll eet lll Reel ealiwerare * | 
Pleurotomaria hy Feed) Loctad ecoallcanyleacrae lee 
Raphistoma ... ner aq, coo dase || ceo |) oon 
EKuomphalus ... a ae Aas cl cal [occ oll Varta 
Cyclonema ... noe 360. {ane Wheass. |-ooa || 686 || seas} aoe 
Holopea aes aes ON lececenl Reread ecrroce sect a Aral es 
* 
* 
Holopella ser Bee Sool excel larson ltreiee, |lexceme hectscie|fae al 
* 
1x 
> ok 
* x 
* OK 
* * 
* * 

* * * Ke K OK 
* 
* 

* * * * 
* 
* 
*% 
* 
* 
* 


Loxonema oe sae np | cao eal arc enero Wieser 
Trochus Se aac Ade. || cece ected Reread (ert 
Acroculia 506 P53 aco.|| opel (aoceu | MBSemn| imeben beaten! (nnowl| Pesce ecto Py Ni ode | PS] €% | 
Trochonema ... Aas ane | 
Macrocheilus ... wae ides ||| “eco s| hacoe| Matokl Ieee 
Naticopsis eae ame p00 || ood.|| coe 1) aoe. || Gonelll eon 
Platyschisma ... dis Aoo._||: Scion || sass) | ceteaa lee ieee leccaal Leora! laser bee | eae) s eer mem ace | 














