1853.] WYMAN CARBONIFEROUS REPTILE. 65 



convoluted, and processes of the pulp-cavity extending between the 

 folds (see fig. 4). 



The coexistence of two kinds of teeth above-mentioned is met with 

 in both Archegosaurus and Labyrinthodon among Reptiles, and in 

 Lepidosteus and other allied Ganoids among Fishes. 



The minute teeth seen on the fractured edge of specimen No. 16, 

 and on the surface of No. 22 (PI. III. fig. 3), appear to be pha- 

 ryngeal, but may nevertheless belong to the pterygoid or palatine 

 bones ; this last supposition is sustained by the fact that in specimen 

 No. 16 a tooth of larger size coexists with the smaller ones, which 

 woidd be less likely to occur among pharyngeals. 



4. On the edge of specimen No. 8 is a well-preserved bone, en- 

 larged at either extremity, resembling one of the bones of a reptilian 

 fore-arm or leg. 



5. Specimen No. 9 contains a strongly curved bone, nearly cylin- 

 drical in the centre, but which is quite broad and thin at either ex- 

 tremity. In its general shape it resembles the bone marked b, in the 

 sketch of the pelvis oi Menobranchus (PI. II. fig. 8). This bone ar- 

 ticulates in ichthyoid reptiles with the rib-like bone to which I have 

 already compared No. 1, fig. 6, & fig. 8 a. According to Prof. Owen, 

 both the bones here referred to, taken together, constitute the ilium 

 or pleurapophysis. 



6. With the above-mentioned bones occur numerous small scales, 

 or bony plates, with indistinct concentric markings (see PI. III. 

 fig. 2), and also sculptured dermal or cranial bones of a larger size 

 (specimen No. 4, PL II. fig. 5). The former are seen in specimens 

 Nos. 1, 19, 22, 23, 25, 26 ; the latter, in specimens Nos. 4, 15, 16, 

 17, 18, and resemble the cranial bones of Archegosaurus, as well as 

 those of some of the Ganoid fishes. These scales and plates re- 

 spectively have such similarity of style as to render it probable that 

 they belong to one individual. 



7. To sum up the characters of the animal to which the above- 

 described bones belonged, we may describe the head as having been 

 covered with bony plates, the surface of which was distinctly sculp- 

 tured. The teeth were of two kinds, a smaller series attached to 

 the jaws, and a larger or folded series, which may have been attached 

 either to jaws, pterygoids, palatines, or vomer. The coexistence of 

 these two kinds of teeth is met with in Labyrinthodons and Ganoid 

 Fishes. 



If the bones marked Nos. 1 and 9 (see above. Notes 1 and 5), 

 resembling a and b, fig. 8, PI. II. (the iliac bones oi Menobranchus), 

 are true pelvic bones, then it becomes highly probable that the animal 

 to which the above-described bones and teeth belonged was allied to 

 Labyrinthodont reptiles. 



8. All the fossil remains hitherto mentioned may have belonged 

 to one individual between 2 and 3 feet in length ; but on some of the 

 same specimens of stone (Nos. 11, 12, and part of No. 1), there are 

 several small biconcave vertebrae, usually more or less crushed, which 

 seem to have formed part of a much smaller species, probably not 

 more than 5 or 6 inches in length (see PI. III. figs. 4 to 7). In the 

 finest specimen. No. 12 (PL III. fig. 5), may be seen in one part a 



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