PALZOZOIC. BRACHTO PO DA. CAMBRIAN AND SILURIAN. 
CAMBRIAN. LOWER SIL. UPPER SILURIAN. 
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SPECIES. BS 3 FS c=} FH ala [=| Bla “d 3 BIA ie = REFERENCES. 
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HISIRSISIRISIAIPIFIFIF IA sib |e |s 
LINGULID. 
ODOUR NT secs cosreses Bichwald, 1829 
Ungula Pander, 1830... 
Orthis (pars)... Von Buch ...... 
Aulonotreta ... Kutorga,1847.. 
— Davidsoni ...... ILE «Che epecqaee| ks atl local aed [ooo cal Bed face P]...Jxla] Pf..[...]...]..., Dav. Mono. Brach. vol. i (General Introd.), p.136, £. 54-56 
(Salt. MS.); ib. Dav. Mono, Brit. Sil. Brach. Pal. Soe. 
p. 58, t. 4, £. 30-39. 
Var. tranversus Salt. ............|.. Pen faoet boc! loos pect leoelleoel toad xlxlx| P|..{..-]-.-|...] Dav. Mono. Brach. vol. i (General Introd.), p. 136, f. 53 
(Salt. MS.); ib. Mono, Brit. Sil. Brach. Pal. Soc. p. 59, 
t. 5, £. 1-6. 
— plumbea ......... Salt. Ht feos fad Mots hoa fase lsod (see teed fork (occ fase acts fers .|...] Vide Obolella. 
Var. Woodwardi Salt. ..: ad|\ond [sa eal [eee [rt | ft x |x| «|..[.f..[..f[...]| MS. Coll. Mus, Pract. Geology; ib. Dav. Mono. Brit. Sil. 
Brach. Pal. Soc. p. 60, t. 5, f. 7, 8. 
DISCINIDS. 
Orbiculoidea ...... D Orbigny,1847 
Schizotreta...... Kutorga vr... 
— Beckettiana ... Dav. ......s00. Apa Ise feed [ear ode SoH eel food loos ssdleccliselleee|iees| confess] .--] Mono. Brit. Sil. Brach. Pal. Soc. p. 75, t. 7, £..19. 
— Forbesii ......... DONS Bees cievceee: at] bos) loocl (Bed) (oacl food Inout teodt Ia x | «| x leecfece[eee|oe-[...] Orbcewla, Bull. Soc. Géol. France, 2 ser. vol. v, p. 334, t. 3 
f. 45; ib. Phill. and Salt. Mem. Geol. Surv. vol, ii, pt. 1, 
Pal. App. p. 371, t. 26, f. 2.  Orbiculoidea, Mor. Ann. 
Mag. Nat. Hist. 2 ser. vol. iv, p. 321, t. 7, £. 3; ib. Dav. 
Mono. Brit. Sil. Brach, Pal. Soc. p. 73, t. 7, £. 14-18. 
— implicata ...... MS COU) Micea cere |e salen ‘eee (eee alee [ass [ee Se eal ce seal tealinen eeelisenl muzecen@rania. y 
Orbicula ....0..c0.0 Cuvier, 1798 ...|... Peel lead are (oe seal oval ated cee altodlorclaod saa eadiccdinenl| Wario Ib erator 
ORTHIDE. 
Oxthisn.cvencesrers-s Dalmann, 1827 
— actonie ......... SOW aires Aeactealen Jeahinwte|(ocs | eg ge |e | feorlece|eoefene|accfeee]eoo{-eee.] Sil, Syst. p. 639, -. 20, £.16; ib. M‘Coy, Brit. Pal. Foss. 
p. 212; Siluria, 4ed. p.192, Foss. 35, f. 2, t. 5, £.115 
ib. Mem. Geol. Surv. vol. iii, p. 339, t. 21, f.1-8; ib. 
Day. Mono. Brit. Sil. Brach. Pal. Soc. p. 252, t. 36, f. 5-17. 
— equivalvis ...... ED GOs? Biante csec | ame We ee Reel ea seslecel ae [aoe] one] a | ¢ Jee] ere] eoe]oee]eeo] BULL. Soe. Géol. France, vol. v, p. 321, t. 3, £.14;3 ib. Lond. 
Geol. Jour. t. 27, £. 5; ib. Mono. Brit. Sif? Brach. Pal. 
Soc. p. 263, t. 30, f. 9, Io. 
— alata) ............ SOD see ros aeeawecses|| oe | fea] (2a |e eee see | eof leesl lest lites Spirifer, Sil. Syst. t. 22, f. 7. Orthis, Salt. Siluria, 2 ed. 
p. 55, £.15, t.5, £.6: ib. 4ed. p. 51, Foss.11, £.15; 
t. 5, f£. 6: ib. Dav. Mono. Brit. Sil. Brach. Pal. Soc. p. 232, 
t. 33, f. 17-21; ib. Salt. Mem. Geol. Surv. vol. iii (Geol. 
N. Wales), p. 337, t. 11 B, f. 13. 
— alternata......... SOW: easescee: 2541 faed| fool nod (ood pod |= [oor] joo8 Be eee iod local ea Beales (eles Orthis, Sil. Syst. t.19, f.6; ib. Siluria, 4ed. t.6, f. 5. 
O. retrorsistria, M‘Coy, Brit. Pal. Foss. t.1 H, f.12,13; 
ib. Mem. Geol. Surv. vol. iii, p. 340, t.19, f.11-13. ?O. 
alternata, Day. Mono. Brit. Sil. Brach. Pal. Soc. p. 264, 
t. 31, £.1-8. 
— Bailyana TITS ereconcnsco| ten deileeclise [ees ed te eed Pee velecfeeeeeefece[eceeee]ee] Mono, Brit. Sil. Brach. Pal. Soc. p. 223, t. 29, £. 19, 20. 
i “ Vet. Akad. Handl. p. 116, t. 2, £.5, 1827; ib. Hising. Leth. 
Suec. p. 71, t. 20, f.12; ib. Dav. Mono. Brit. Sil. Brach. 
Pal. Soc. p. 217, t. 27; £. 10, 1x. 
— Berthoisi ...... THOT Gecceneeey red ead ond lac bee) 5" eed loos sialeceee|eeefeeeeae]eeefee| Bull. Soe. Géol. France, 2 ser. vol. vi, p. 68, t. 2, f. 45 ib. 
; - i Sharpe, Q. J. Geol. Soe. vol. ix, p. 154, t.8, f.4; ib. Dav. 
Var. erratica,,, Dav. Mono. Brit. Sil. Brach. Pal. Soe. p. 223, t. 32, f. 21-28. 
(Pebble-bed, Budleigh), ib. Q. J. Geol. Soe. vol. xxvi, p- 83, 
t. 5, £.13-16. 
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