PALAZOZOIC. Binal Gal OVE OuDyAT CAMBRIAN AND SILURIAN. 
CAMBRIAN. LOWER SIL. UPPER SILURIAN. 
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SPECIES. =lSlelel iSlolalgiasisialeialele REFERENCES. 
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Orthis (continued). 
— PYoava ..........0 
s A \ sate weineaees Bod face (eral Ipod poole Ie Si load food seslecs[eee{eee[ece{eee|eee]+--| Miem. Geol. Surv. vol. iii. 
Var. calligramma 
— pseudopecten ... M‘Coy ......... erd| eal fewts| soe oat Seo hea BAH fo ee |tselecal|acelecs| cael ver|erl| ISU PROSSs rele p.335 be 351.ba lO. 
— quinquecostata.. M‘Coy ......... Fcalloeel|oed lead feed Ieee] foes lend lade allens||ors| eee] leau|(ce] es] (een eee doep tena. 
— radians ......... IS70i Wsan senoTo8 $6 [sna laos Pe [eos eal eee ee |e realeeel|ess] eel |sas) eerleee| aes Sule SyStaiba'225 forties Silurias) seedeat. Fata L0: 
= NPOQUES co seces<se: eBOMire see secers eH (sec feed) lene PE fear (neg feo vei[ees|eee{eee{eee{eee]eee[ee-] Silurische Brach. Bohmen Naturw. Abhandl. vol. ii, p. 49, 
t.18, f. 7, 1848; ib. Salt. Q. J. Geol. Soc. vol. xx, p. 294, 
inated, tia 
Var. Budleighensis ... Dav....... Be eed aod Ieee (ec Palle leas ves[ece{evelace{eeeeee]ee-{eee] Q.J-Geol. Soe. vol.xxvi, p.82, t.5,f.9-12. (Budleigh pebbles.) 
— remota ......... ISQLEN streuseees OE lirealecel is eefecs aPellbey Re sre | een) ncs|lese|{cecees|esies-|) Silurias, Aled. ps5) Bossi to, fag. 
— retroflera ...... SQUED .occewsnc ens cpl hod [aod ee [oc sae |oadl aed jocd see[oesfecefooe]ess[ece]oeefeee] Vade Strophomena. 
| — retrorsa ......... M“Coy ......... os | nal eR Re B34| ood foe [aot ses[eesfossfore{ersfecs|oeefene] Pede O, porcata retrorsa. ‘ 
— retrorsistria ... M‘Coy ......... Soe loc (Bcc Ieee (eR Bod [aod Hed (bed ses[oee]ece]eca]ecs[ece]eee{eee] Vede O. alternata. 
— revers@ ......... SiH pesenscnoecd 0) (50d food feed feed 604) face P| ...[...]eeefeee{eee{oee{oe]--.| AGd. Synop. Sil. Foss. Irel. p. 72, t. 5, f.2; Dav. Mono. 
Brit. Sil. Brach. Pal. Soe. p. 220, t. 29, f. 11-13. 
— reversa, var. Mullockensis Dav.|...|...|...|...]... wel 2] bal ae feee[icc[eee]oafeeds.[...] O. reversa, Salt. Q. J. Geol. Soc. vol. vii, p. 171, t. 9, £. 133 
ib. M‘Coy, Brit. Pal. Foss. p. 225; Salt. Siluria, 2 ed. 
p. 230, Foss. 48, f. 3. O. reversa, var. Mullockensis, 
Day. Mono. Brit. Sil. Brach. Pal. Soc. p. 221, t. 29, 
f. 14-18. 
— rigidd ......006... DOU spa eAvese sealers col sae ieee (oe Bc (eel Aer ee Welecaleceleeslieeeleceliaeiese|| ede Os austica. 
PGE OT ON onion oa cise cankua saaeahonced Peallerallives ieee] oes pa eae ised lace ses[eco]eacfeee|aes{ees|ees[ee-| 22@e Strophomena. 
— rustica............ SOD sare set eee Bee lseg lace eas ap selece{ecef ae [oe | ae | ae [eeefee{eee{eee|---] Sil. Syst. p. 624, t.12, f.9. O.rigida, Dav. Lond. Geol. 
Jour. p. 63, t.13, £.16,17. O. rustica and var. vigida, 
| Dav. Bull. Soc. Géol. France, 2 ser. vol. v, p. 322, t- 3, 
f.15. O. Walsallii,id.ib. p. 339, t.4, £.7. O. osiliensis, 
Schrenk. Schmidts, Sil. Form. von Ehstland, &e. Archiv. 
Nat. Liv. Ehst. und Kurlands, vol. ii, p. 213. O. rustica, 
Salt. Siluria, 2 ed. t. 20, f. 10; ib. Dav. Mono. Brit. Sil. 
Brach. Pal. Soc. p. 238, t. 34, £. 13-173; var. rigida, 
f.18,19; var. Walsalliensis, f. 20-22. 
— sagittifera ...... MT O0y. s scsees: Beq| |bocl fas ead [ose ass ceclecs{ecel ccc] eeefece|eee{eee]ees] Brit. Pal. Foss. p.227, t.1H, f.15-19; ib. Dav. Mono. Brit. 
Sil. Brach. Pal. Soc. p. 260, t. 36, f. 18-23. 
— Salteri..........., DON reeds cence: |e lses Wes | eae meal iseilieee| Se veless{ecsfoeefecs{eesfee]eee] Momo. Brit. Sil. Brach. Pal. Soc. p. 255, t. 36, f. 31-34. 
— sarmentosa...... MES COY) esc sees oe lee (ee ieee loon veclioe lees | eres secleccfece]eee[eeefeeeeee{ee-] SYHOp. Sil. Foss. Irel. p. 34, t. 3, £.17; Brit. Pal. Foss. p. 227, 
t.1 H, f. 25-28; ib. Dav. Mono. Brit. Sil. Brach. Pal. Soe. 
p. 262, t. 36, £. 35-38. , 
| — semicircularis... Sow. ............ Pee) eae) eel eek Nar sco at hoel bar oes | eel eels eee eel eel OU ySbsmps O20,ntaanecl. 7. 
| — simplex ......... MME COYVocave se Bea [ope ior |eeel ee x | x "cleccleceleceleceleeeee-[ee-] Sil. Foss. Irel. p. 34, t. 3, f.18. O.calligramma, var. simplex, 
| Salt. Mem. Geol. Surv. vol. iii, p. 336. O. simplex, Day. 
] Mono. Brit. Sil. Brach. Pal. Soc. p. 255, t. 32, f. 10, 11. 
— Sowerbyiana ... Dav. ............ Sr eo eo iaatl (aoe oell lever | cea} se vesleee/ecc{eee{eee|eee]eee]e-.| Mono. Brit. Sil. Brach. Pal. Soc. p. 247, t. 35, f. 27-31. 
Orthis calligr. var. Walsalliensis, Salt. (non Dav.) Mem. 
Geol. Surv. vol. iii, p. 337; t.22, f. 6, 7. 
— spiriferioides ... M‘Coy ......... See iccel IBRel ee! eced Weal bea fee (oe seless{ecc{ccc{cce{eecl eee] eee] Strophomena leptena, Brit. Pal. Foss. p. 246; Ann. Mag. 
Nat. Hist. 2 ser. vol. viii, p. 246, woodcut; Salt. Siluria, 
4ed. p.194, Foss. 37, f. 2. O. spiriferoides, Day. Mono. 
= Brit. Sil. Brach. Pal. Soc. p. 275, t. 37, £. 3-7. 
— striatula......... Conrad, MS.and]...}...)...|...)| «|e ]..-}-. _wlecclecclecdleeefeccte--f-..] Geol. Rept. 1842, p. 394, Ilust.105, f.3. O. testudinaria, 
EMMI, Son teen canes Hall, Pal. New York, vol. i, t. 32, f.1; Salt. Mem. Geol. 
Surv. vol. ii, pt.1, t. 27, f. 6-8. O. striatula, ib. Siluria, 
4ed. p. 51, Foss. 11, f.16; p.193, Foss. 36, f.3: Q.J. 
Geol. Soc. vol. xv, t. 13, f.14-16; ib. Mem. Geol. Surv. 
vol. iii, p. 340, t.13, f. 10-14; ib. Baily, Char. Foss. t. 8, 
f.6. ? Orthis testudinaria. 
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