
WENLOCK GROUP. 







Kos 
(55, 
Gaseignd Reference to McCoy’s . ; Agia 
Column of ¥ : Names and References; Observations, &c. Numbers and Localities. 
Drawers. Synopsis: and Figures of Genera. 
FC Leptagonia, p. 248. Strophomena depressa, Dalm. (Anom. rhomboi- | a. 784 (as L. deltoideu 
Ge (as L. deltoidea 8, p. 234.) dalis, Wahl. Leptena, Sil. Syst. pl. 12, figs. | 8 wndata), Coed Sion, Llan- 
Gd2 12—16. Mem. Geol. Surv. Vol. 1. Part 1, | gadoc; a. 736, a. 737, inte- 
p- 283. Strophomena, Siluria, 2nd ed. pl. | rior dorsal valve; a. 738— 
20, fig. 20). a.740,interior ventral valve, 
Dudley, F.C. 
Gd2 Leptena, p. 233. Strophomena corrugata, Portl. sp. (Geol. Rep. | a. 783, Golden Grove, Llan- 
Lond. p. 450, t. 82, figs. 17, 18, non Conrad, | deilo, W. Shale; Myddle- 
Jour. Ac. Nat. Se. Phil. Vol. virr. p. 256, t. | ton Park? 
14, f. 8. 8S. corrugatella, Dav. Sil. Brach. 
p. 301, t. 41, fig. 8). 
Gd2 | Strophomena quadrata, Lindstrém. Much | b.777,a.715, Dudley, F.C. 
Gcd smaller in allits parts; and with the abrupt 
front turned down only a short way. It is 
oblong, compared with its larger congener, 
and more delicately striated. 
Gc8 Leptena, p. 241. Strophomena antiquata, Sow. (Siluria, 2nd ed. | a. 882, Walsall; b. 
Gd2 pl. 20, fig. 18, Foss. 58, fig. 8, Davidson, | b. 784, Dudley, F. C. 
Gc9 Sil. Brach. p. 297, t. 44, fig. 2). A rough, 
but elegant shell, coarser in its imbricated 
striation than any other Strophomena. 
Gb Leptena, Strophomena simulans, McCoy. A species I | a. 465, Myddleton Park, 
1 H, figs. 33—35, p. 246. fear founded on several specimens of several | Caermarthen, W. Shale. 
species. I cannot define it. 
Gc9 Strophomena, sp. Dudley, F.C. 
Leptena, Dalman, proper. Shells involute. 
The ventral enveloping the dorsal one. The 
cardinal processes connate with the widely 
set hinge-teeth (in Strophomena they are 
distinct), and the muscular scars very long 
—not squarish. The habit of the three 
genera Orthis, Strophomena, Leptana, is so 
distinct, that little difficulty can be found 
by the student in separating them. 
Gd2 p. 240. Leptena transversalis, Dalman (Siluria, 2nd | a. 782, as L. sericea, var. 
FO as L. sericea, var. rhombica, ed. pl. 20, fig. 17, Davidson, lc. t. 48, | rhombica, Llyn Alwen; 
p- 239. fig. 1). One of the shells that range through | a. 747, outside dorsal valve; 
as L. quinquecostata, p. 236. 
a good many formations (Bala rocks to 

a. 748, interior ditto; a. 
19—2 
