UPPER LUDLOW GROUP. 

Case and | 
Column of 
Drawers. | Synopsis: and Figures of Genera. 

Reference to McCoy’s 

Gf2 
Gf 
Gf2 
Gf 
Gf2 

Gf 
Gf5 
Gf4 
Gf 
Gf4 
Gf 

p. 220. 

Leptena, p. 243. 
Leptagonia, p. 248. 
Leptena, p. 249. 

P. var. naviformis, p. 263. 
p: 262. 
Pterinea lineata, p. 261. 
Names and References; Observations, &c. 
Numbers and Localities. 




Orthis lunata, Sow. (Siluria, 2nd ed. pl. 20, 
fig. 11). This very fine-ribbed shell is often 
mistaken; but if the interior characters of 
the hinge be studied with the outside, no 
difficulty ought to be felt in separating it 
from its companion OQ. orbicularis, a coarser 
shell with fasciculate strie. The teeth of 
the dorsal valve are nearly parallel and the 
central cardinal process linear. 
Strophomena filosa, Sow. (see p. 146). More 
common in Ludlow rocks than elsewhere; 
at Ludlow it varies exceedingly in the sculp- 
ture. 
Strophomena depressa, Sow. (see p. 147). 
Chonetes lata, Von Buch, (regarded by some 
as the true C. striatella of Dalman) but the 
references in the 8rd ed. of Siluria are so 
confused and sterile that no use can be 
made of them. The best fig. is that in 
Siluria, 2nd ed. pl. 20, fig. 8. 
LAMELLIBRANCHIATA. 
Avicula Danbyi, McCoy. Generally wide oval, 
a large fine shell. It varies much, 
Pterinea lineata, Goldf.? (Pet. Germ., t. 119, fig. 
6). A beautiful shell, close to P. retroflexa, 
but with long wing, and very fine regular 
radiating ridges of strie. (See P. lineatula.) 
Pterinea retroflexa, Wahl. sp. (His. Leth. Suec. 
t. 17, fig. 12). Has convex right valve, var. 
naviformis of Conrad. 
Pterinea retroflexa, var. erecta, McCoy. 
Pterinea lineatula, D’Orb. (Siluria, pl. 23, fig. 
16). Extremely common in Ludlow rock. 


b. 976, Kington, Hereford- 
shire; b. 978, Woolhope ; 
b. 979, Mortimer’s Cross, 
Aymestry; b. 980, Down- 
ton Castle, Ludlow; b. 981, 
Leintwardine; b. 982, Ben- 
son Knott, Kendal. 
b. 983, Burton and Brock- 
ton, near Wenlock. 
b. 984, Burton and Brock- 
ton, near Wenlock. 
b. 985, near Woolhope; b. 
986, Benson Knott, Kendal; 
b.987, Lambrigg Fell, Ken- 
dal; b. 988, Brockton and 
Burton; b. 989, Mortimer’s 
Cross, Aymestry; b. 990, 
near Ludlow; b.991, Down- 
ton Castle. 
b. 49 to b. 52, Benson 
Knott, Kendal; b. 52, right 
valve; b. 51 is a rounder 
variety; b. 955, left valve. 
b. 85, Benson Knott, Ken- 
dal. 
b. 83, b. 84, Kendal, type 
variety; b. 82, right valve, 
Kendal; b. 19, Kirkby 
Moor, Kendal. 
b. 62, Laverock Lane, Ken- 
dal, 
