1859.] DAWSON — FOSSILS IN COAL. 277 



A very interesting portion of this collection is a quantity of car- 

 bonized skin, which must have belonged to one of these reptiles, pro- 

 bably to the last- mentioned species. It is smooth and shining, and 

 in part still contains the imbricated bony scales, which it covers as 

 in modern lizards, projecting a little beyond their edges. In one 

 place, probably at the occiput or shoulders, it contains a transverse 

 row of broad, striated bony plates, behind which are some projecting 

 bony tubercles. This part of the skin, which is as perfect as if taken 

 from a recent specimen, is represented in fig. 13, PL II.* Other por- 

 tions of it appear scaleless, with minute pores or punctures ; and 

 attached to it are a number of pointed lobes or processes covered 

 with minute ovate scales, each having a puncture in the centre. 

 These must have been large and ornate cutaneous appendages, 

 similar to those on the back and gular pouch of the Iguanas, unless 

 they were swimming-lobes like those on the tail of the Crocodiles, 

 or, which seems less likely, branchial processes like those of some 

 perennibranchiate Batrachians. 



Besides the more perfect bones above referred to, there are some 

 small patches of broken bones, probably of Hylonomus Wymani, 

 which have the appearance of being coprolitic ; but in the distinct 

 masses of coprolite, I have seen no distinguishable remains except 

 those of Xylobius, or some similar Articulate. 



I may perhaps be permitted to add to this paper a notice of a 

 remarkable tooth found several years since by Sir W. E. Logan in 



Figs. 27-29. — Batrachian (?) Tooth from the Coal-measures of Nova 

 Scotia. (In the Collection of Sir "W. E. Logan.) 



Fig. 27 



Fig. 29. 



Fig. 28. 



Fig. 27. The tooth of the natural size. Fig. 28. Croea Bectaon, nat. size. 

 Fig. 29. Tart of the cross section, magnified. 



one of the bituminous limestones of the JoggJns, and which may 

 indicate the existence there of another labyrinthodonl reptile of 



large size, though it is also possible that it may have belonged to a 

 8auroid fish. It is represented of the natural size ill fig, 27, and the 

 structure of its dentine, which is beautifully preserved, in fig. 29. 

 It has been broken, both at the base and at the summit, before it 

 was enclosed in the rock. 



* Not engraved. Tho tubercles mentioned above are not represented in the 

 figure. They occur almost immediately in front of the large scale*, and resemble 

 the shorter bony tubercles of some f<i>ccies of VhryiUHona. 



