PALHOZOIC, 
; 3] m) - las 
A ale|.. “ a 3 5 es Ale 
SPECIES. eal 8) |S) olS]e| Bs ls 
AlEIS|S] ols |S iAlsis/sis 
2/2 | Sl Sells eltislale 
AGE Peri eee 
ISIE /4la lo lsis = ie ie 
Pterograptus ...... Holm, 1881 
— ACUEUS ose cee FOph.  veccccceolons|eee[eve|ecefoos| ak [owe] coefooe|ere| one 
MonoGRAPTID, 
Rastrites ............ Barrande, 1850 
— distans............ IETF. pecerecno| lone] (oe5) jose! load |509 [eed 
—"FUBAX ....-.s0i0es [BOM Tescen cases palces|xes|bee|lese] ces 
— hybridus ......... Dapw. wen. . 695| a9 load [od keel [Soe 
LASIOGRAPTID® 
(GLOSSOGRAPTID®). 
Retiograptus ...... Hall, 1865.... 
Suess. 1851 ... 
— tentaculatus ... Hall ...,..... Dod foo ses 
RETIOLITIDE. 
Retiolites ......... Barrande, 1850 
Gladiograptus Hop. & Lapw. 
— fibratus ......... ia pUO ese se ses| con) ees] ene| ere[ees|css| cell sealers |ers|esel ese 
— obesus ........-... DOP Ws wessesese|ces|e0-|se| ess] a-«|vecl ees 
SS Fee WE 5 2 Ganetocod {oc9| ceo [bod Iood| [aod [oan [Boel |¢°3} load [ode Ison) [ook 
DICHOGRAPTIDE. 
Schizograptus ... Nicholson, 1876 
— reticulatus ..,... INU Chest ce vccecuess| cee] ssa) costlees | lei eee | coe seal ewe 
DICHOGRAPTIDE. 
Temnograptus ... Nicholson,1876 
— multiplex........ AVACH ote vasecsseoss| ses] ac ects 
— Nicholsoni ...... LOCTEIRS epppcena cod F6o|(oo3 
DICHOGRAPTID. 
Tetragraptus ...... Salter, 1863... 
— approximatus ... Nich. ............ cont Ieee [God fecal {es lee! oad aaa 550) lads) ad) lapel aaa 
— Bigsbyi ......... TAU Fevencceecss (ease leas| ee 
=—-NCENtICWALUS wees) LLL, cessasccosselecel sea] oos| cert ceil cea eae less] coal eee | ees lees | cer 
— fruticosus ...... TLALY eaccecesass|tevs| cou feoel cee | fa [ eset ces] cael coal eee 
THAMNOGRAPTIDE. 
Thamnograptus... Hall, 1859 
— Barrandii......... FET eS corr aed teen [dod food bec 
— Scoticus ......... JOT pCO COA cor} eee) bor| |sed lace || el coal cel ceed Ieee 
— FYPUS weeeeeeerees FOIE ee eececacosd ler bad [asd eed 2: 
DICHOGRAPTIDE. 
Trichograptus ... Nicholson, 1876 
— fragilis............ NiGh: mecrecessess J---]-+- 
CAMBRIAN. LOWER SIL. 
a. ms 
HYDRO OA 
UPPER SILURIAN. 
es 
= — 
| Lower Ludlow. 
| Aymestry Lmst. 
| Upper Ludlow. 
= 
| Tilest. & Passage. 
CAMBRIAN AND SILURIAN. 
REFERENCES. 
Vide Ptilograptus, Hall, p. 13, loc. cit. 
Geol. Mag. Dec. II, vol. iii, p. 313, f. 2. 
Grapto. de Bohéme, p. 66, t. 4, f. I. 
Geol. Mag. Dec. II, vol. iii, p. 313, t. 10, f. 5. 
Rast. peregrinus. 
Var. of 
Graptolithus, Geol. Survey Canada, Rept. for 1857, p. 134. 
Retiograptus, ib. Canadian Org. Remains, Dec. II, 1865, 
p. 116, t. xiv, f. 6-8; ib. Lapw. Ann. Mag. Nat. Hist. 
5 ser. vol. vi, p. 22, 188. 
Belfast Nat. Field Club (Grapto. Co. Down), p. 136, t. 6, f. 28. 
Rept. Brit. Assoc. 1871, p. 104 (Gala Group) ; ib. Belfast Nat. 
Field Club (Grapto. Co. Down), p. 137, t.6, f.29, 1876-7. 
Belfast Nat. Field Club (Grapto. Co. Down), p. 137, t. 6, 
f. 30. 
Dichograptus, Q. J. Geol. Soc. vol. xxiv, p. 143, t. 5, 
f. 3-5. 
? Dichograptus, Q. J. Geol. Soc. vol. xxiv, p. 129, t.6, f. 1-3. 
? Didymograptus, p. 8, loc. cit. 
Fide Herrmann, Geol. Mag. Dee. III, vol. iii, p. 19 (wood- 
cuts, p. 17, f. 5). 
Graptolithus, Geol. Surv. Canada, Org. Remains, Dee. II, 
p. 86, t. 16, f. 22-30. ? Phyllograptus similis, Hall. 
? Tetragraptus, Bigsbyi Linnars. Lapw. 
Graptolithus, Geol. Surv, Canada, Rept. Progress, 1857, 
p. 132; ib. Quebec Group, p. 88, t. 4, f. 12-16. 
Graptolithus, Geol. Surv. Canada, Rept. Progress, 1857, 
p. 128; ib, Geol. Surv. of Canada (Grap. Quebee Group), 
p. 90, t. 5, f. 6-8, t. 6, £. 1-3. 
Cat. West. Scott. Foss. p. 7, t. 6, f. 95. 
Cat. West. Scott. Foss. p. 7, t. 6, f. 94. 
Vide Phyllograptus. 
Vide Dichograptus, loc. cit. p. 6. 
397 
