182 
SELACHII. 
verse wrinkles upon one of the longer margins, suggesting 
an approximation towards the teeth of Ch'oclus. 
Egerton Coll. 
44857. One “upper” dental plate, another suggestive of the 
“lower” dental plate fused with one small adjoining 
tooth, and six anterior (Helodus-shaped.) teeth of large 
size. Presented by Benjamin Bright , Esq., 1873. 
P. 5858. Two small dental plates, resembling the “ lower,” but 
more convex, and an elongated anterior tooth with a 
transverse suture dividing the crown into two parts. 
P. 4213. A very large dental plate, perhaps of this species, and 
apparently consisting of three of the Helodus- shaped 
teeth fused together. Enniskillen Coll. 
Psephodus salopiensis, sp. nov. 
Type. “ Upper ” dental plate shown in PI. VI. tig. 14. 
A small species, the “upper” dental plate usually measuring 
about 0-012 antero-posteriorly. Outer margin of “upper” dental 
plate outwardly curved, and the inner margin also gently curved 
throughout its length, the bend being almost in the middle; 
coronal contour gently, though considerably, raised along a line 
connecting the bend of the inner border with that of the outer. 
“Lower” dental plate ( probably ) strongly convex, very oblique; 
antero-lateral border marked by large indentations ; inner border 
curved. 
The complete dentition of this species not yet being known, and 
so many other Cochliodonts occurring upon the same horizon, it is 
impossible to identify its anterior teeth, which are probably included 
among the anterior teeth described below as of the form of Helodus 
Icevissimus, auctorum. 
Form. Sf Loc. Carboniferous Limestone : Shropshire. 
42189. “Upper” dental plate, shown in PI. YI. fig. 14, of the 
natural size, forming the type specimen ; Oreton. 
Baugh Coll. 
42188,42215. Two smaller abraded examples; Oreton. 
Baugh Coll. 
42230. Supposed “ lower ” dental plate, shown in PI. YI. fig. 15, of 
the natural size ; Oreton. A very similar dental plate is 
met with in a Russian species of Psephodus described 
