








56 UPPER CAMBRIAN. 
Case and Reference to McCoy’s 
Column of e Bet Names and References; Observations, &c. Numbers and Localities. 
DESO. Synopsis: and Figures of Genera. 
G1 Atrypa [? Headi, Billings. var. anglica, Da- | Common at Bird’s Hill, 
vidson, Sil. Brach. t. 22, figs. 1—8]. Llandeilo, &e. 
Gl Hemithyris depressa, p. 201. | Triplesia? Maccoyana, Davidson, Sil. Brach. | a. 157, Brynbedwog, near 
p. 199, pl. 24, f. 29 (2. depressa, McCoy, not | Bala, 
of Sowerby in Silurian System). In David- 
son’s Monog. p. 123, &. depressa, Sow. is an 
Athyris. 
Gl Rhynchonella (or Atrypa) sp. b. 206*, Ravenstonedale. 
G1 Hemithyris, p. 199, Meristella angustifrons, McCoy (Siluria, 3rd | b, 206, Craig Head, Gir- 
Pl. 14, figs. 6—8. ed. woodcut 49, fig. 2). A common fossil in | van. 
Llandovery rocks, and very rare in Middle 
Bala. 
Gl Rhynchonella, sp. (Headi, Billings?) Coniston (same at Grug, 
Meristella. Llandeilo). 
Gl Hemithyris. Rhynchonella nasuta, McCoy sp. (Davidson, | a, 156, Craig Head, Gir- 
Pl. 1 1, fig. 5, p. 208. Mon. Sil. Brach. p. 173, pl. 23, f. 19). van. 
Gl Rhynchonella, sp. Yspytty Evan. 
Several other specimens undescribed are com- 
mon in Wales, Ireland, Scotland. 
Gl Pentamerus lens, p. 209. Pentamerus lens, Sow. sp. Sil. Syst. 21, f. 3. b. 207, Coniston. 
New genus of Rhynchonellidez, long mesial 
septum in the dorsal valve (looks very like 
a Pentamerus at first sight). 
p- 208. [P. globosus, supposed to be found at Beaver’s 
Grove, near Conway, is really a Bellero- 
phon, and must not figure here. No species 
of Pentamerus has ever occurred in Lower 
or Middle Bala !] 
Gl Porambonites intercedens, Pander (Spirifer po- | a. 205, Wrae Quarry, 
rambonites, Geol. Russ. Vol. 11. p. 131, pl. 2, Upper Tweed. 




fig. 3). A very peculiar genus, allied to Or- 
this; but with a curiously punctate surface. 

