PALAOZOIC. 18L YC ID) IR (O) YA OVAN, CAMBRIAN AND SILURIAN. 
CAMBRIAN. LOWER SIL, UPPER SILURIAN. 
a AM ed eles allncl! oles oll 
re a Slo] SISIBIlEIZlels 
ALI Als le \SSaISislele 
SH Hb ad -|a/Zlo],/2 Sileia 
SPECIES. Tels] lS] olslel Sse lSlBlSlel REFERENCES. 
ABE eels eeceighene 
Hila) Pl als Esl ed Biel s| alo] @ 
SIO) E SIS) S) as] SparS lS 12) So) aia) 3 
SIS IS [AOI IRIE IE IE IA IIB IB 
Graptolithus (continued). 
— tenuis ............ FR bo-nechoose * | & | & lee pee | Geol. Rept. p. 319, t-19, f..7; ? ib. M‘Coy, Brit. Pal. Foss. 
p-6, t.1 B, f. 4,5 3 ib. Salt. Q. J. Geol. Soc. vol. vii, p. 173, 
t.10, f.1; ib. vol.v, p.13, t.1, f.9. Monograp. Salteri, 
Geinitz, Verst. Grauw. die Grapto. p. 36. G. tenuis, Salt. 
Siluria, 4 ed. p. 51, Foss.11, f.12; ib. Nich. Q. J. Geol. 
Soe. vol. xxiv, p. 538, t. 20, f. 31; ib. Hall, Pal. New 
York, vol. i, p. 272, t. 74, f. 2. 
= CAME vrseceveiee AS00%5 cag0seec0e6) (E00 food |00) and (oso G01 ebc\faor| Isc sJescfeeeleeeleceleeeleve{eee| Wade G. Hisingeri. 
— turriculatus ... Barr. ............ eral ea areal ean ee x ferefece|ooe| 2 [eee[eceeee|eee]eeefsee| Grapto. de Bohéme, p. 56, t. 4, £.7,11; ib. Nich. Q. J. Geol. 
Soc. vol. xxiv, p. 542, t. 20, f. 29, 30. 
— vomerinus ...... NACH snc csons cose Bed load leedllbiod (eae G54 lace jac fad vee] ok [eee[ees[eee]ees[eeelee.| Mono. Brit. Grapto. pt. 1, 1872, p. 53, woodcuts A, B, C. 
Graptopora ......... Hall, 1857...... 
— socialis ......... ISAT © Seappocsiced 350) (ae) ood [eee] (eee 654) [ad 54 lone sesfeve[eeelecs[ecs[aeefeaefee| Wade Dictyonema. 
NEMAGRAPTID®. 
Helicograptus ... Nicholson, 1868 
Cenograptus ... Hall, 1868 ...... 
— gracilis ......... UT GLUT Ne toecnteees 66¢|/noelfocelloed [aoa 2 \ tone iBod [poo sealeceleaslees[ece|seefeeeeee| Pal. New York, vol. i, p. 274, t. 74, f.9; ib. Baily, Q. J. 
Roy. Geol. Soc. Dub. 1861, t. 4, f.5; ib. Mem. Geol. Surv, 
DICHOGRAPTID®. Treland, Sheet 133, p.12, f. 3. 
Loganograptus ... Hall, 1868? ... 
— Logani ......... THOU wcvcevescces Boo ood lect food [el loscl lace! load! fae seslecsfeceleeefeaeleaeleee|eee| Grapto. Quebec Group, p.100, t.9; ib. Hall, Pal. New York, 
vol. iii. Dichograp, Salt. Q. J. Geol. Soc. vol. xix, p. 138, 
woodcut, p.137, f.11. Dichograp. Nich. Q. J. Geol. Soe. 
vol. xxiv, p,128. 
Murchisonites ...... Géppert, 1859 .|..-|...)...|...J-.- nonltocd jeex| [sec sesfeee|eeclece{oeelece|eee]eee] Vide Oldhamia. (Antiqua.) 
NEMAGRAPTID®. 
Nemagraptus...... Emmons, 1855 . 
— capillaris......... STOUT cers ul ciis anes 6c6) 580) (ooel oor) [422] |peo!looel noc face see[ece|eceleesfees}eor]oeelees] Am. Geol. vol.i, p.109, t.1, £.7; ib. Hopk. and Lapw. 
Grapto. of Arenig and Lland. Rocks, St. David’s, Q. J. Geol. 
Soe. vol. xxxi, p. 653, t. 34, f. 2. 2? Cladograptus capil- 
laris, Carr. Geol. Mag. vol. v, p.130, t. 5, f. 7. 
Oldhamia ......... Forbes, 1848 ...)..|...|06| foe peal ecalianes Pleats ses[ece[eee{oee[eesfeee{eee]ee.| Jour, Geol. Soc. Dublin, vol. iv, p. 20. 
— antiqua ......... SHOR OES eesee ses #ill- ae] -2ellese flees Sed lace food Joos ses[eve[ece]eos[oee]ees[eoe]eee] MKinahan, Trans. Royal Irish Acad. vol. xxiii, p. 557, £. 5; 
Salt. Mem. Geol. Surv. vol. iii (Geol. N. Wales), p. 282, 
t. 26, f£.1-3. Murchisonites Forbesi (Oldhamia), Gépp. 
Ueber Foss. Flora Sil. Dev. Unter-Kohl. p. 441, t. 35, f. 1, 
in Acta Acad. Cas. Leop. Carol. Naturze Curio. Novo Acti, 
vol. xxvii, 1860; Oldhamia, Baily, Fig. Char. Brit. Foss. 
vol. i, p. x-xii, Expl. plate, p.1, t.1, f.1 a-f. Oldhamia 
antiqua, Baily, Geol. Mag. vol. ii, p. 385, 397, woodcuts, 
Pp. 391-4, £. 3, 4. 
— Var. discreta ... Kin. ©1950 [od food Jood jauc| (oe [0 (aba Trans. Roy. Irish Acad, vol. xxiii, p. 556: var. of O. antiqua. 
— radiata............ Forbes £3 Iooe| foaG|[ose| facel ede) fone fend lose Kinahan, Trans. Roy. Irish Acad. vol. xxiii, p. 557, f. 3-5, 
8-10; ib, Salt. Mem. Geol. Surv. vol. iii (Geol. N. Wales), 
p. 281, t. 26, f. 4, 5, and vars. No. 6,7; ib. Baily, Geol. 
Mag. vol.ii, p. 385-397, woodcut, p. 395, (2 vars.) Oldhamia, 
Gépp. Ueber Foss. Flora Sil. der Dev. und Unter-Kohlen, 
p- 437, t. 34, f.1, 2, in Acta Acad. Ces. Leop. Carol. &c. “ 
NEMAGRAPTID®. vol. xxvii, 1860, O. radiata, Baily, Fig, Char. Brit. Foss. 
= VOlw dy Psi 2euita gt. 2. 
Pleurograptus ,.. Nicholson, 1867} 
— linearis ......... OGPR wre dexs sseses nce| asd lecel lea book Fa eel [eed (eee secfece[avelece{ees|eeefece{aae] Cladograptus, Ann. Mag. Nat. Hist. vol. iii, Dendrograptus, 
Geol. Mag. vol. iv, p. 70. Pleurograptus linearis, Nich. 
Geol. Mag. vol. iv, p. 258, t.11, f.1-4. Cladograptus, 
Siluria, 4 ed. p.541, Foss. go, f.8, Carruthers, Trans. Roy. 
Phys. Soc. Edinb. 1858, p. 467, £.1. 
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