
CARBONIFEROUS CONODONTS OF WEST OF SCOTLAND. 343 
Polygnathus scitulus, Hinde, new species. Plate [X., Figs. 9, 
10, 11.—Tooth somewhat triangular, with a slightly curved 
basal margin witha sub-central well-developed cup-shaped cavity. 
At one extremity of the tooth is a large, compressed, triangular 
denticle with an acute outer edge ; behind this is a series of 7 to 
14 minute elongate denticles, closely disposed side by side. 
[In Scotland it occurs at Linn Spout, Monkcastle, Glencart, 
Hillhead, Orchard, and Limekilns. Specimens measure 8 mm. 
in length. } 
Prioniodus Tulensis, Pander, Mon., p. 30, t. 2a, f. 18, 19, 20.— 
A relatively large curved tooth, with one or more horizontal or 
oblique divergent processes at its base, on which there are 
occasional and smaller denticles, These appear to be similar 
to Pander’s specimens, which were from the lowest beds of 
the Carboniferous limestone in the province of Tula, Russia. [In 
Scotland it occurs at Glencart, Law, Glenbuck, and Skate- 
raw, near Dunbar. Plate IX., Figs. 15, 16, 17. Specimens 
measure from 1:0 to 16 mm. in length. 
Prioniodus angulatus, Hinde. Quar. Jour. Geol. Soc., 1879, p. 
360, pl. 15, f. 17.—Tooth with an angular flattened base, with a 
prominent compressed denticle at the apex and several smaller 
on either side. It is present in the Devonian of New York and 
the Carboniferous of Ohio. [In Scotland it occurs at Glencart, 
Monkcastle, and Birkhead. Plate X., Figs. 18, 19. Specimens 
measure from 1:0 to 1:1 mm. long.] 
Prioniodus spicatus, Hinde. Quar. Jour. Geol. Soc., 1879, p. 
361, pl. 16, £. 1-3.—Tooth with a narrow horizontal base, carrying 
afew minute denticles and a single large, curved, terminal 
denticle which is extended below into a small spiked process. 
It occurs in the Devonian of North America. [In Scotland it is 
got at Birkhead. Plate X., Fig. 20. Only one specimen has been 
found, ‘5 mm. in length. } 
Prioniodus peracutus, Hinde, new species, Plate X., Figs. 21, 
22, 23.—A single straight or slightly curved, compressed main 
tooth which extends below a small horizontal base to an obtuse 
point, the outer margin, and both margins below the horizontal 
process, are acute. There are a few minute, closely set denticles 
on the horizontal base. This form differs from P. spicatus in its 
larger size, the sharp edges of the main tooth, and in the very 
