PALAOZOIC. BRACHIOPODA. CAMBRIAN AND SILURIAN. 
CAMBRIAN. LOWER SIL. _ UPPER SILURIAN. 
SS _ SSS > 
a AS Ss SRS 
Ae Sls la leis lalslz 
Hic 3 . ro mo) 
SPECIES. slalalSt tS] oheta| mies isle (Pha le | REFERENCES. 
Asal) spo ls ia lsl|S\S| 518i ais] 
ARG BEG BeeeBEBSE 
HISISISISiAISSPPIFE lls ia 
Orthis (continued). 
— intercostata ... Portl..........0+ #69) bod! lana hed face pod) lia feel [od sesfessfacs[ace|eee[eee[ore]eee] Geol. Rept. p. 454, t. 37, £.3; ib. Day. Mono. Brit. Sil. 
Brach. Pal. Soc. p. 236, t. 8, f. 1-3. 
FePEEPRNA Reo aor foal coe Isecl are (enced (eel lois Sil. Foss. Irel. p. 31, t. 3, f. 13. 
Dre PERE ERORTS 00 CORE ARRrE Ot) Ged) (its) ead) (cer! eeollbes! leon fase) (cod (esol lose Vide O. protensa. 
eres - ie seclece[avcfeee|eaelecelessfece{aee{oeeleeel eee! Amomites, Nova Acta Upsal, vol. viii, p. 66. Spirifer, 
E Von Buch, Berl. Akad, 1834, p. 48, t. 1, £.13,14. Orthis, 
Salt. Mem, Geol. Sury. vol. iii, p. 339, t. 4, £. 8-10; ib. 
Day. Geol. Mag. vol. v, t.16, £. 20-22; ib. Mono. Brit. 
Sil. Brach. Pal. Soc. p. 230, t. 33, f. 22-28; ib. Baily, 
Char. Foss. t. 3, £. 4. O.vaticena, Salt. =O. lenticularis, 
Day. Geol. Mag. vol. v, p. 314, t.16, £. 20-22. 
Pluto |uee[eeefeee]-e[ee] Bull. Soe. Géol. France, 2 ser. vol.v, p. 323, t. 3, f. 19; ib. 
Trans. Geol. Soc. Glasgow, Pal. series, vol. i, t. 2, f. 5-7; 
ib, Mono. Brit. Sil. Brach. Pal. Soc. p. 208, t. 26, 
f. 4-9. § 
my lore (ane sec[ecafecefoce]oee] | ok [eee]eue{eoefoes|eee] Mono, Brit. Sil. Brach. Pal. Soc. p. 254, t. 38, £. 26. 
Sil. Syst. t.5, £15. O.orbicularis, Sow. ib.f.16. O. lunata 
et O. orbicularis, M‘Coy, Synop. Sil. Foss. Irel. p. 32. 
O. lunata, Salt. Siluria, 4ed. t. 20, f. 11, t. 35, f. 29; ib. 
M‘Coy, Brit. Pal. Foss. p. 220; Day. Mono. Brit. Sil. Brach. 
Pal. Soc. p. 215, t. 28, f.1-5. 
— Menapie......... PICKS tcctoee les Socom hea) (ad lesal lect aeel lene sesfece[ere]aee[ecefeee[eee]eoe| Dav. Geol. Mag. vol. v, p. 314, t.16, f. 24-28; ib. Mono, 
Brit. Sil. Brach. Pal. Soc. p. 228, t. 33, £. 8-12. 
Vide Strophomena pecten. 
Vide O. elegantula. 
Orthambonites, Beitr. zur Geogn. Russ. t. 26, f.10. Orthis, 
Murch. and Vern, Geol. Russ. t.13, f.3,4. Orthis, M‘Coy, 
Brit. Pal. Foss. p. 221. 
Day. Mono. Brit. Sil. Brach. Pal. Soc. p. 267, t. 30, £.1-8. 
(Salt. MS.) 
Vide Strophomena. 
— plicata............ SStUIR Gaacsanaooce Foe|laee eal ser] foo Baal 2 ltaod loos secless[ece{ecs[oss[ece|eeefeee| Sperifer, Sow. Sil. Syst. t. 21, £.6. O. calligramma, var. 
plicata, Salt. 2 ed. t.5, f.7; and Mem. Geol. Surv. vol. iii, 
p. 336, t. 22, f. 5. O.plicata, Dav. Mono. Brit. Sil. Brach. 
Pal. Soc. p. 245, t. 35, f. 25, 26; t. 37, f.1. ©. plicata, 
M‘Coy, Brit. Pal. Foss. p. 222. 
— polygramma .,, Sow. ...........- eallder face ltesel ears seclecefece] x fees] | xX |eseleoelece|eeefeee| Atrypa, Sil. Syst. t. 21, f.4. O. Michelini vel reversa, Has- 
well, Sil. Form. Pent. Hills, p. 34, t. 3, f.8. O. polygramma, 
Day. Trans. Geol. Soc. Glasgow, Pal. series, vol. i, t. 2, 
f, 12-16; ib. Mono. Brit. Sil. Brach. Pal. Soc. var. Pent- 
landica, p. 219, t. 29, f. 1-10. 
O. poreata, Sil. Foss. Irel. p. 32, t. 3, £.14; Brit. Pal. Foss. 
p. 223, t.1 H, f.41, 42. ? O. occidentalis, ? O. sinuata, 
2? O. subquadrata, O. subjugata, Hall, Pal. New York, 
vol. i, t. 32 a-c, p.126, &c. O, inflata, Salt. Q.J. Geol. 
Soc. vol.i; Mem. Geol. Surv. vol. ii, pt.1, var. retrorsa, 
t. 19, f. 14, and t. 27, f. 3. O.grandis, Portl. O. poreata, 
Bill. Geol. Canada, p. 312, f. 319; ib. Pal. Foss. vol. i, 
p.135, f£.111. O. poreata, var. retrorsa, Salt. Mem. Geol. 
Surv. vol. iii, p. 338, t.19, f.4. O. grandis, Portl. Rept. 
Lond. &c. p. 452, t. 32, f£. 25 (non grandis, Sow.). 
O. poreata, Dav. Mono. Brit. Sil. Brach. Pal. Soc. p. 250, 
t. 31, £. 12-20; t. 46, f. 4. 
— porcata ........ MES COW Mane casie scllocolfooal fone) [boc a 
Var. retrorsa. 
Be ROUUCLOULER sevasaqecsssiscaciase ses) (cvelvae|ecellest[ onsen lee oer | eer Vide Tryplesia. 
— protensa ,,....... ISLE, Becatonnoace eel ecsl escllired Bee “; Sil. Syst. t.22, £.8,9. O.lata, Sow. ib.f. 10; Siluria, 4 ed. 
t.9, £. 22, 23. O. lata, var. protensa, Salt. Mem. Geol. 
Surv. vol. iii, p. 276, 361. O. protensa, Day. Mono. Brit. 
Sil. Brach. Pal. Soc. p. 257, t. 36, f. 24-30. 
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