84 SILURIAN. 
Smurian (Rocks) System, Sedgwick; Upper SILURIAN, Murchison. 
Above all the Cambrian Rocks—and this throughout the Northern Hemisphere, so far as known—the 
Silurian rocks, consisting of the May Hill (or Clinton) Group, Lower Wenlock or Woolhope Group (Sedgwick and 
Salter), Wenlock Group (Murchison), Ludlow Group (Murchison) including Downton sandstone, lhe unconformably 
on the Cambrian rocks. The percentage of common fossils between the two systems is very small—not more 
than 6 or 7 per cent. 
May Hill Sandstone (Sedgw.). 
Upper Anticosti group, Canada. 
Upper Llandovery (Murch.) Upper Caradoc, olim. Clinton group of North America. 







SORE Reference to McCoy’s 
pee Syopeiss ait lligurds’ Of Gener Names and References; Observations, &c. Numbers and Localities. 
GRAPTOLITIDA. 
Ga G. ludensis, p. 4. Graptolithus priodon (Siluria, 2nd ed. pl. 12, | May Hill and Tortworth. 
SE" Ga figs. 1, 2). 
eeceeeeiditieeeedee?” 
CE? Pe 
AMORPHOZOA. 
p. 12. Stromatopora striatella, D’Orb. (Siluria, 2nd | May Hill, Gloucestershire. 
ed, pl. 41, fig. 31). 
Ga (Vioa prisca is an annelide, see next page.) 
ZOOPHYTA. 
Ga Corals. Heliolites interstinctus, Linn. (Siluria, 2nd ed. | b, 422, May Hill. 
Paleopora, p. 15. pl. 39, fig. 2). 
Pl. 1¢, fig. 4, p. 16. Heliolites megastoma (Siluria, 3rd ed. p. 188, | Malverns. 
Foss. 30, fig. 7). 
Gal pao: Favosites alveolaris, Goldf. (Pet. Germ. t. 26, | b. 424, May Hill; b. 425, 
fig. 1). Norbury. 
Ga F. alveolaris, p. 19, var. a. | Favosites multipora, Lonsd. (Siluria, 2nd ed. | May Hill. 
pl. 40, fig. 5). 
Favosites cristata, Blum. (Siluria, 3rd ed. Foss. | Malverns. 
18, fig. 1). 
p. 20. Favosites aspera, D’Orb. (Siluria, 2nd ed. pl. | Malverns. 
40, fig. 1). 
Gal p. 26. Halysites catenulatus (Siluria, 2nd ed. pl. 40, b. 429, May Hill; Llan- 
fig. 14). dovery. 
Paleocyclus, Milne Edw. [See Wenlock lme- 
stone. | 
Gal Palxocyclus preacutus, Lonsd, (Siluria, 2nd ed. | b. 432, May Hill; Worces- 
pl. 41, figs. 4, 5). ter Beacon, W. side. 
