EXPLANATION OF THE PLATES. 97 
PLATE XXXII. 
FOSSILS OF THE OLD RED SANDSTONE. 
PISCES._CEPHALASPID 2. 
Fig. 1.—a, b. PrERICHTHYS CORNUTUS, Agassiz. 
Mon. des Poissons fossiles du vieux Grés Rouge, &c., p. 17, pl. i., figs. 1—5. 
Original. a. Upper portion of a nearly complete specimen in the unique 
collection of the Earl of Enniskillen, reduced to half the natural size, 
b. Portion of one of the plates of the body, showing granulated surface, 
from the same specimen. 
Mippie Oxtp Rep SaNnpsTone.—Lethen-Bar, Nairnshire. 
Fic. 2.—a-d. Crepuaraspis LYELLI, Agassiz. 
Sil. Syst., vol. ii., p. 589. Poiss. Foss. p. 142, pl.i., a, figs. 1-5. 
From the figures in Sil. Syst., plates i. and ii. a. Side view of the en- 
tire fish, reduced to half natural size, op. cit., pl.i., fig. 1. 6. Upper 
view of head, reduced to one-third of natural size, op. cit., pl. ii., fig. 1. 
c. Scales of the head, natural size, from the same figure. d. Scales of 
the back, enlarged three diameters. Glanmiss, Forfarshire. Museum, 
Sir. C. Lyell. 
LowER OLp Rep SAnpstoNE.—Herefordshire and Scotland. 
Fic. 3.—a, 6, CoccosTEvs DECIPIENS, Agassiz. 
Poiss. Foss. Grés Rouge, p. 26, pl. vii.-x. 
a. Origmal. Showing bones of cranial shield, medio-dorsal plate, and im- 
pression of vertebral column, to extremity of tail, reduced to one-fourth 
of natural size. O. R.S. Lethen-Bar. Mus. Earl of Enniskillen. 
b. Original. One of the plates of cranial shield, showing granulated and 
radiated surface. O. R. S. Edderton. Mus. G. S. I. 
Mippte OLtp Rep Sanpstone.—Cromarty ; Caithness; Pomona, Orkney. 
SAURO-DIPTERINI. 
Fic. 4.—a, b. OSTEOLEPIS MAJOR, Agassiz. 
Poiss. Foss. Grés. Rouge, p. 51, pl. xix., figs. 1-3. 
a, b. From figs. 1 and 3 of the plate and work above cited. a. The entire 
fish, reduced to half size. 6. Scales, (rhomboidal), of do., enlarged. 
Mrippie Op Rep SanpstonE.—Lethen-Bar. 
