CARBONIFEROUS CORALS AND BRACHIOPODS 129 
expansa, probably belongs here, as it shows a weak area and 
a broad shallow fold. Cf. PL 13, fig. 4, Dav. 
A second decorticated specimen, in a poor state of pre- 
servation, is most probably also an example of this species. 
Rhynchonellids. 
E hynchonella (sensu stricto) : 
Rhynchonella pleurodon, var Davreuxiana, de Kon. 
Small Rhynchonellas, with sharp continuous folds, a deep 
sinus containing two buried ribs and a strongly projecting 
mesial fold, composed of three sharp angular ribs, agree 
fairly w^ell with PI. 23, fig. 19, Dav., but are usually con- 
siderably more elongate. 
A more exhaustive discussion of the forms must be based 
on better and more numerous examples than are to be 
found in the collection. This form is extremely abundant 
in the lowest beds of the “ Lower Limestone Shales ” ; the 
specimens in the collection are all only partially exposed 
on the surface of slabs, derived from “ Lower Limestone 
Shales, Leigh Woods,” and from the well-known Buchiana. 
Bed.” 
Pugnax : 
Pugnax accuminata, Martin. 
A single specimen from Lower Carboniferous, Clifton ” 
agrees with PL 21, figs. 4 to 13, Dav. It has three angular 
folds on the mesial fold. 
Pugnax reniformis, Sow., agrees PL 19, fig. 3, Dav. 
Pugnax pugnus, Martin, agrees PL 22, fig. 2, Dav. 
Strophomenids. 
Leptena : 
Leptena analog a, Pliill. 
Two poor, but unmistakable specimens occur in the 
