466 GLYPTOL.EMUS KINNAIRDI 
the ventral median line. The lateral scales, rhomboidal in form, 
extend from the medio-dorsal to the medio-ventral series, forming 
curved rows transverse to the axis of the body in general direction, 
but presenting a marked concavity, or re-entering angle, forwards, 
With respect to the dentition of Glyptolemus, I find a series of 
minute pointed teeth along the outer margins of both upper and 
lower jaws. Besides these there is a single large tooth upon each side 
of the symphysis of the mandible, and at least one more of the same 
kind, a little in front of the middle of the ramus (fig. | b, Plate II. 
[Plate 34]). In the upper jaw, the pterygopalatine apparatus is, as 
I have already pointed out, provided with several similar teeth. 
Glyptolemus is at present only known to occur in the Old Red 
Sandstone of Dura Den. 
EXPLANATION OF PLATES I, AND II. [PLATES 33 AND 34.] 
Pare I. [PLATE 33.] 
Fig. 1. Side view of a specimen of Glyptohemus Kinnairdi, half the size of nature. This 
and the other figures of the plate are taken from specimens in the Museum of 
Practical Geology. 
Fig. ta. Head of the same, natural size. 
Fig. 2. Ventral and anal fins of another specimen. 
Fig. 3. Ventral view of another specimen, half the natural size. Mus. Pract. Geol. 
Fig. 4. Scales magnified. 
PLATE II. [PLATE 34.] 
The figures give various views of a specimen of Glystohemus Kinnazrdiin the Museum 
of Practical Geology, and are all, except 3, 4, and 5, of the natural size. 
Fig. 1. Dorsal view of the body. 
Fig. ta. Lateral view of the head. 
Fig. rb. Front view of the head. 
big. 1c. Ventral view of the body. , 
Fig. 2. Sandstone matrix into which the body fits, and which retains many of the dorsal 
scales and the pectoral fins. 
Figs. 3, 4, and 5. Scales from different parts of the body magnified. 
November 1, 1861. 
