162 LABYRINTHODONTIA.. 



R. 1464. Cast of an imperfect innominate. The original, which is 

 the type, was obtained from the R-othliegendes (Lower 

 Permian) of Kounova ; and is figured by Fritsch in his 

 ' Fauna der Gaskohle,' vol. ii. pi. lxvii. figs. 1, 2. 



Purchased, 1888. 



Macromerium scoticum, Lydekker l . 



Much smaller than the type species, and agreeing in the size of 

 the teeth with M. bicolor, Fritsch 2 , of the Bohemian Permian. The 

 teeth appear to be very similar to those of the latter 3 , showing the 

 same large pulp-cavity, but are generally somewhat less curved and 

 more slender. This feature is at present the chief evidence for 

 regarding this form as specifically distinct from M. bicolor, although 

 its lower geological horizon is probably alone sufficient. There is 

 no evidence to show in what respects M. bicolor, which was founded 

 upon the evidence of the teeth, differs from some of the above- 

 mentioned small species based upon the pelvis. 



Hab. Europe (Scotland). 



R. 310. Slab of rock showing the outer surface of the greater por- 

 (Fig.) tion of the dentary element of the right ramus of the 

 mandible ; from the Lower Carboniferous of Gilmerton, 

 near Edinburgh. The type specimen ; figured by the 

 writer in the ' Quart. Journ. Geol. Soc' vol. xlvi. pi. xii. 

 fig. 1. One large tusk-like tooth is preserved a short dis- 

 tance behind the extremity of the symphysis, while the 

 base of another remains at the extremity ; traces of two 

 larger tusks are shown at a distance of about 1^ inch 

 behind the second tusk, posteriorly to which all the teeth 

 are small. The crowns of the teeth accord generally with 

 those of M. bicolor, figured in pi. lxx. of Fritsch's memoir, 

 showing the same distinct carinae, and strongly marked 

 grooves on the smooth surface of the crown; while the 

 broken teeth exhibit a similar large pulp-cavity. In their 

 less marked backward curvature the teeth are more like 

 those of the type species. 



Ennisldllen Collection. Purchased. ] 882. 



Quart. Journ. Geol. Soc. vol. xlvi. p. 290 (1890). 



Fauna der Gaskohle, vol. ii. pt. ii. p. 41, pi. lxvii. fig. 15 (1885). 



See Fritsch, op. cit. pi. lxx. figs. 1-5.. 



