PALAOZOIC. BRACHIORO DA: CAMBRIAN AND. SILURIAN. 
CAMBRIAN. LOWER SIL, UPPER SILURIAN. 
] 
- 
SPECIES. REFERENCES. 
Tilest. & Passage. | J 
Har. St. David’s. 
| Pass up. 
| Meneevian. 
| Lingula Flags. 
| Caradoc or Bala. 
| Low. Llandovery. 
Up. Llandovery. 
Woolhope Lmst. 
Wenlock Shale. 
Wenlock Lmst. 
Lower Ludlow. 
Aymestry Lmst. 
Upper Ludlow. 
Tremadoce. 
Arenig. 
| Llandeilo, 
Strophomena (continued). 
— complanata...... SO menanaennes bsa| 00g) faSalfciod| [sa peel \ loo (oon sec[ece[ece[one|ere]oee]eee{-e-| Leptena, Sil. Syst. p. 636, t. 20, f. 6. 
Orthis, Sil. Syst. t. 22, f.12; ib. Mem. Geol. Surv. vol. ii, 
pt.1, p. 379. Stroph. Salt. Siluria, 4 ed. p. go, Foss. 15, 
f. 7, t. 9, f.16. Leptena, M‘Coy, Brit. Pal. Foss. p, 242. 
Stroph. Day. Mono. Sil. Brach, Pal. Soc. p. 315, t. 46, 
f. 7-10. 
au) 
— compressa ...... OUD. wamsie sees -c9|-00] |Q0o| (dod bod en ies iicos 
Var. Llandeiloensis... Dav. ...... Ro (eea| (B64 leer [a> Pll Bsa lead bic sec|see|ece|eue|oee|eee]---{---| Mono. Sil, Brach. Pal. Soc.-p. 316, t. 46, E.11—14. 
— concentrica...... SP OPE ten nvanannect Poa! fecal lace aod aoe Balter Snel (eos veafece{ecaleee[eee{ee-|---|-..| Oxthis, Geol. Rept. p. 452, t. 37, f.1. O.asmusi, M‘Coy, 
Sil. Foss. Irel. p. 28. Orthis pseudopecten, ib. t.3, £. 16. 
? Var. of O. expansa. 
— corrugata ...... Porth nnies ces oc |ocoliooa trod bod ses[ocs|eocfece|ese|eee|eos[eee{eee|ee-[eo]-| ede S. corrugatella, 
Orthis corrugata, Portl. Geol. Rept. p. 450, t. 32, f.17, 18. 
Leptena, M‘Coy, Brit. Pal. Foss. p. 233. O. undulata, 
M‘Coy, Synop, Sil. Foss. Irel. p. 36, t.3, £.22. Leptena 
corrugata, Barr. Sil. Brach. Bohm. Naturw. Abhandl. 
vol. ii, t. 21, f.16. §. corrugatella, Dav. Mono. Brit. Sil. 
Brach. Pal. Soc. p. 301, t. 41, f. 8-14. 
— corrugatella ... Dav. ............ be) esl baal | (be 0) (ie | [4 [Sool daa Moa Hod peal ssa load lawl lees 
— Dayi .......0 WD. sse|loop|lace\fobc| loos Pealiswel eae see wee] ae [cce[eee[eee[eeefeee]-e.| Mono. Brit. Sil. Brach. Pal. Soc. p. 292, t. 41, f. 7. 
— deltoidea Ann. Geol. Rept. p. 115, 1838, New York; ib. Hall, Pal. 
New York, vol. i, p, 106, t. 31 A, f. 3. Leptagonia 
semiovalis, M‘Coy, Synop. Sil. Foss. Irel. p. 26, t. 3, f. 6. 
S. deltoidea, Bill. Geol. Canada, p.163, f.141. Orthis 
undata, var. B, M‘Coy, Sil. Foss. Irel. p. 36, t. 3, f. 21. 
Leptena deltoidea, M‘Coy, Brit. Pal. Foss. p. 234, t. 1 H, 
f. 38, 39. Leptagonia plicatis, M‘Coy, Sil. Foss. Ivel. 
p. 25, t. 3, f. 5. Orthis sublevis, M‘Coy, Sil. Foss. Irel. 
p. 35, t. 3, f.19. Strophomena deltoidea, Day. Mono. Brit. 
Sil. Brach. Pal. Soc. p. 292, t. 42, f.1-5; t. 39, f. 22. 
— ib. var. 8, undata... M‘Coy...... Be [aloe (onal cet [esl head [368 cwcleceleccleceleceleee{eee]-2.| Orthis, Sil. Foss. Irel. t. 3, f. 21. Strophomena, Brit. Pal. 
Foss. p. 234, t. 1 H, f. 38,39. Strophomena, Dav. Mono. 
Brit. Sil. Brach. Pal. Soc. p. 291, t. 39, f. 23, 24. 
— depressa vivir. DOV iasseceees Pyalerelarslenc|ecs Salleelos exe secfessfere|eoe[eee{eee[eee{eee| ade S. rhomboidalis. 
Leptena, Antecken. t.6, f..4, Lep. Dalm. Act. Holm. 1827, 
p. 108, t.1, f. 3; ib. Sil. Syst. t.12, f.1. Orthis, M‘Coy, 
Synop. Sil. Foss. Irel. p. 30. 8. euglypha, Siluria, 4 ed. 
t.20, f.10. Producta euglypha, passim. » Lept. euglypha, 
Sow. Sil. Syst. p. 622, t. 12, f.1; ib. Day. Bull. Soe. Géol. 
France, vol. vy, t.3, f.4 (2ser.). Strophomena, Dav. Mono. 
Brit. Sil. Brach. Pal. Soc. p. 288, t. 40, f. 1-5. 
Orthis, Sil. Syst. t.20, f.14. O. pecten, Sow. ib. t. 21, f.9; 
ib. Salt. Mem. Geol. Surv. vol. ii, pt.1, p.377. O.expansa, 
M‘Coy, Brit. Pal. Foss. p.217; ib. Siluria, 4 ed. p. 193, 
Foss. 36, f. 2, t. 6, f. 4. ? O. expansa, var. concentrica, 
Portl. Geol. Rept. p. 452, t.37, f.1. Stroph. Day. Mono, 
Sil. Brach. Pal. Soc. p. 312, t. 45, f. 1-10. 
Orthis, Sil. Syst. p.630, t.13, f. 12; ib. Dav. Lond. Geol. Jour, 
vol. i, p. 62, t.13, f. 24. Leptena, Dav. Bull. Soc. Géol. 
France, 2 ser. vol. v, p. 318, t.3, f.9. Orthis, Salt. 
Siluria, 4ed. t. 20, f. 21. Stropho. Day. Mono, Brit. Sil. 
Brach. Pal. Soc. p. 307, t. 44, f. 14-20. 
Leptena, Lond, Geol. Jour. vol. i, p. 12, t. 12, £19 p1Os Ds 
— euglypha ...... 5 COM ne ade ran Sce\ ec ned foes Hae Saal tell 
— expansa ......... GIO ewweenes ces Peal lana) toe ee) as Sal oe sell eeelliese 
¥] Nie! * Bull. Soc. Géol. France, 2 ser. vol. v, t. 3, £.12. Stropho- 
mena, Day. Mono. Brit. Sil. Brach, Pal. Soc. p. 317, t. 47; 
1 Gy 
seefees x|* | «| * Orthis, Synop. Sil. Foss. Irel. t. 3, f.11, p. 30. Leptena, 
M‘Coy, Brit. Pal. Foss. p. 244. Leptena, Day. Lond. 
Geol. Jour. t.12, f. 5-8. Strophomena, Salt. Siluria, 
4ed. p. 227, Foss. 59, f. 4,5. Strophomena, Day. Mono. 
Brit. Sil. Brach, Pal. Soc. p. 290, t. 40, f. 9-13. Lept. 
Day. Bull. Soc. Géol. France, 2 ser, vol. v, p. 317; f. 5. 
