





62 UPPER CAMBRIAN. 
Gasoand Reference to McCoy's : 
Column of A E Names and References; Observations, &c. Numbers and Localities, 
Drawers. Synopsis: and Figures of Genera. 
Gm Leptena, p. 233. Strophomena alternata, Conrad (Hall, Pal. | Girvan, Ayrshire. 
N. York, 1. pl. 31a, fig 1), Common. A 
difficult species to recognize as distinct from 
flatter varieties of L. deltotdea. 
Gm do. Strophomena. Like S. alternata. Coniston limestone (lime- 
stone nodules in Old Red), 
Holbeck Gill. 
Gm | Leptena compressa, p. 242. _Strophomena concentrica, Orthis expansa, | ,.254*, Tynant, Horderley. 
Portl. (Geol. Rep. pl. 37, fig. 1). Distin- 
guished from S. expansa by the strong inte- 
rior concentric ridges, and the teeth also 
diverge differently. 
Gm Leptena, p. 238. Strophomena corrugata, Portl. (Geol. Rep. | Keisley, Dufton (in green 
pl. 32, fig. 17). This pretty group of sharply | slates). 
waved and striated species is European, not 
American. It probably contains many simi- 
lar species. 
Gm Leptagonia, McCoy, p. 248. Strophomena depressa, Dalman (L. rhomboida- | Selattyn Road, Oswestry; 
lis, Wahl.), Min. Conch. t. 459. The common- | Corwen; Cefn Coedog; 
est Brachiopod next to Orthis elegantula, in | Llansantfraid, Glyn Cei- 
all the slate rocks—ranging from Lower | riog; and all through N. 
Bala to Lower Carboniferous! and §. Wales. Coniston 
limestone, everywhere. 
Gm p. 249. Strophomena, var. y ptychotis, McCoy. Sil. Syst. | b. 242, Wilfa Penmachno; 
Treland. Cefn Coedog,Corwen; Llan- 
bedrog; Pwllheli; Cader 
Dinmael, Corwen. 
Gm Lept. p. 234. Strophomena deltoidea, Conrad. Hall, Pal. N. | Coniston (two species here) ; 
York, t. 13a, fig. 3. Under this name Prof, | Alt-yr-Anker, Meifod. 
McCoy seems to include some varieties of 
the L. tenuistriata, Sow. and also other spe- 
cies. L. deltocdea is well figured by Hall. 
Gm Pl. 1 H, figs. 38, 39, p. 234. Strophomena, var. 6 undata (see deltoidea). A | Grug; b. 248, Llandeilo; 
As a var. of deltoidea. marked form, resembling S. depressa, but | a. 153, Bala; a. 153*, Cyrn- 
with no recurved portion. y-Brain, Wrexham; b. 247, 
; Bryn Melyn, Bala; Glyn 
Diifwys; Alt - yr - Anker, 
Meifod. 
Gm | Pl. 14, figs. 36, 37. Strophomena ungula, McCoy. Llansantfraid, Glyn Cei- 
Leptena, p. 249. 

riog; Selattyn Road. 

