xliv TABLE OF GENERA, 

CaMBRIAN. SILURIAN. 


Lower Cambrian. 
stone. 
Menevian. 
Ffestiniog. 
Tremadoe. 
Arenig Group. 
Lower Bala. 
Middle Bala, 
Upper Bala. 
May Hill Group. 
Lower Wenlock. 
Wenlock Group. 
Lower Ludlow. 
Upper Ludlow. 
Downton Sand- 
Ledbury Shales. 


Crustacea (continued) 
AMglina a sc aeealllRee Neciesal|Nbsice> Nl taee | ye 
Barrandia sco aie Pasill. cies iectonlll ucacea aaeeaa tee 
Lichas tes o6t ea alters eerrsaitees (ames utes 
Illeenus ron nak Peat) ceca Weicon he-coee acetan aeiea 
Acidaspis S06 aoc SR nae Waa leee = IP Seer IMG Sule « 
Staurocephalus 50 Bee eee iertece | eect liceoe (cece ee 
Spherexochus... bao pee elBeacicc'|; sees sestadlt eaeeal eee al|) eae 
Cybele se obi eee lPeree | ooh | see see lMarceolll eas 
Enecrinurus.... dae Seta | cress |-Ge at |) retell reel hese festa 
Harpes 306 “coc aril) ccc eel Seen eral eae |e 
Proetus ei hes Seu MliBecall eam: Ili-vewe. Wlteemee Peace gece mete |aers = || coc |} ey |e 
Cyphaspis Ee Sl me eM ee 1s ee eae eae hl Ue i eer Be cet ae 
Primitia ane ae Bost || eon Niners lence hese [ues ls ¢ 
Hymenocaris ... eas Soc; || conn ery alee 
Ceratiocaris... 000 560. |} 060 |} G00 |] c00 |) Ih 600 ||P coo ||) re Hieeae soo || coo: | esl) hq he 
Lingulocaris ... Sac Sag ||; oben leant saneis (foxes 
Cythere sil Aap nape |P aepe meet lees fmemenel ecnecn ee 
Beyrichia wi 406 aoa. |) seo |foo8 || oc0 [f Soe: |] cco ee es Bo) Dag || esl eaeeal WR li oe 
Caryocaris ... oon Faces eg ace -|lnoaoesl eeu tak 
Peltocaris ae sols Serre | Ree lalla cal Mra | ears Act ees eens rath tel aden Alls scicic Beall age 
Dictyocaris aK, aise aa eee eee eee doo eee eee aiele eee sists eee aos eee * 
Leperditia —... aa Jeey|| cae. |fiscabal lecbenallasecun cece <|ieeed. | lereeal lean Spill ecb (aneen eral, ke eso' || ey 
Pterygotus ... Wis fe Eee acapalinc sar l| Mat ly eae ullcceee led lonek Saat, seclhig 
Slimonia oat Se oe ees) gcethellecisctel|l saat cactulea est ll esccel| sak Seon tgeiet | eee ee 
Hemiaspis ... abe Sob. |t Boeunleeeo. Nene Merew [aoe leseee |eesae! Wiser dacl| een ll eaee lll ate 
Kurypterus bs te ea ang. ||, coo" aaa. loce: |] Boo |) ae ll" cao Neaa || noe Aon |) 600. | Goa: I) os0 

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Bryozoa 
Glauconome ... Gab s00 || 540 || cop |} 000 |] o¢6 II dee | -c06 |} teas |} 8 
Ptilodictya ... Ace 500. |} 260:|| G05: |] coe || cco {| cao ll 08. Il Boo. |! 
Trematopora ... ob S66) ||fr are |faaen al Pesca | cra Alf Gee lhecren || Receaa| cne 300 || 000 
Discopora cnt 500 ao |} 268 Il noo ‘Ione {I oc6 |) cao:|! oc. aoc: || occ aod |) 066 
Ceriopora aes 500 086 |) a6o:(N aco. } a00°|| goa! |] adel] ceo | Goo |} coe doo || cae 
Fenestella ... sac doom cote [litaanr|-coa:4 Mee 1) ska. |lvocor lleeeaelll lane Bath | lone 
Dictyonema ... bie bd edog: Il Gort 4! ae leaden Wecas |lcoce: [keene lecac 960 || oa0 
Polypora 506 S55 coo |} éco. || coo | 605 || coo |} aco IIa6a || cas |! onc 900 ||| 606 
Brachiopoda 
Lingulella ... 20 
Obolella wee 
Discina pes 
Orthis ee 
Kutorgina 
Lingula re a Bann tt cogulleeses {f coat lace 
Crania ae de mists; || vajore’ ll steel eetoam | teers i 
Siphonotreta ... 
Strophomena. ... 
Lepteena a 
Trematis x 



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