344 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
short horizontal base. [Occurs at Glencart, Robroyston, Monk- 
castle, Stacklawhill, Limekilns, Low Baidland, and Law. 
Specimens measure from ‘8 to 1:5 mm. in length.] 
Prioniodus complex, Hinde, new species. Plate X., Fig. 24. 
—Tooth with a slightly compressed sinuous base. At one end the 
primary denticle projects to form a spike-like process beneath the 
base ; next to this is a large, upright denticle which is succeeded 
by a series of about 16 minute denticles. At the end of the base 
is another large denticle, obliquely projecting forwards, the front 
margin of which is minutely serrated. [Occurs at Linn Spout 
and Glencart. The largest specimen measures 1'4 mm. in 
length. | 
Priontodus geminus, Hinde, new species. Plate X., Fig. 25,— 
Basal portion consisting of two straight or slightly curved arms, 
carrying minute denticles often unequal in size; the arms meet 
at an acute angle, and at the apex is a large, compressed, double- 
edged denticle. [Occurs at Glencart and Linn Spout. A 
complete specimen measures ‘7 mm. | 
Prioniodus porcatus, Hinde, new species. Plate X., Fig. 26.— 
Tooth with a short, narrow, somewhat compressed base, which 
carries five or six minute, conical, obliquely placed denticles, and 
is terminated by a slightly curved, conical, acutely pointed larger 
denticle, which projects obliquely forwards. [Occurs at Monk. 
castle. Only one specimen found; 1:1 mm. in length.] 
Cienognathus obliquus, Pander. Mon., p. 35, pl. 2a, f. 11.— 
The basal portion of the tooth is horizontal and compressed ; at 
or near one extremity is a large conical, acutely pointed denticle 
at right angles or oblique to the base, with a series of minute 
sharply pointed denticles on one or both sides of it. [Occurs at 
Birkhead and Law. Plate X., Figs. 27, 28, 29. A complete 
specimen measures 1'4 mm. long. ] 
EXPLANATION OF PLATE. 
Figure 1.—Polygnathus dubius, Hinde, x24; from Lower Limestone, 
Birkhead, Dalry. 
Figure 2,.—Polygnathus (Gnathodus) Mosquensis, Pander, x22 (side 
view); from Upper Limestone, Monkcastle, Kilwinning. 

