496 Dr. C. I. Forsyth Major — On Fossil Dormice. 



given it would appear that part at least of the Steinbeim MynxidsB 

 observed by bin) prol)ably belong to a larger form than Muscardimis 

 Sansaniensis. The roots of the lower cheek-teeth, as described by 

 Eraas, agree with those of the species here described under the above 

 heading. 



Schlosser likewise unites the Steinbeim species with " Myoxns 

 Sansaniensis." But, otherwise, by a true conception of the pattern 

 of Myoxine molai's, he considerably improves on his predecessor's 

 work, although provided with much scantier material from Stein- 

 beim. A good description and a fairly good figure of the lower 

 molars are given. ^ They are described as exhibiting four transverse 

 crests running completely across the triturating surface, whilst three 

 minor crests, starting from the inner margin, terminate in the 

 middle of the crown. In older specimens a partial fusion between 

 two adjoining transversal crests may occur. The Steinbeim species, 

 according to Schlosser, shows affinities with Glis {Myoxus) as well 

 as with EUomys, sharing with the former the large number of 

 transverse ridges ; with the latter the concavity of the crown, 

 surrounded by strongly raised margins. 



Further on it M'ill be shown that at La Grive - Saint - Alban 

 the Myoxidge are represented by a second form, larger than the 

 Muscardimis Sansaniensis and otherwise different, belonging to 

 (he genus Eliomys, and identical with the lower molars described 

 by Schlosser from Steinbeim. Filhol was aware that the Steinbeim 

 species is distinct from ' Myoxus Sansaniensis ' of Sansan : " . . . . 

 il m'a paru que I'espece de Sansan etait differente de celle de 

 Steinbeim, qui a ete coufondue avec elle." ^ Deperet follows Schlosser 

 by mixing up both in the synonymy of 'Myoxus Sansaniensis.''^ 



No upper jaws of this larger dormouse from La Grive are at my 

 disposal. This is the more to be regretted as the only upper molars 

 — from the Middle Miocene of the Hahnenberg, Eies — which pre- 

 sumably belong to this species are, according to Schlosser, from an 

 old individual, so that the original pattern cannot be clearly made 

 out; this is, in fact, confirmed by the published figure.* 



I have found at La Grive two mandibular rami of the left side, 

 at present in the Geological Department of the British Museum 

 (M 5,298), which I hold to be identical with the species described 

 by Schlosser from Steinbeim. The mandibular angle is imperfect 

 in both, but on one specimen it can clearly be seen that it was 

 perforate. In one of the specimens only m. 1 is preserved, in the 

 other m. 1 and m. 2, the former of the two being damaged on the 

 inner side. The teeth preserved and the alveoli of those missing 

 show that each of the true molars had three roots, two smaller 

 antei'iorly and a larger odd one posteriorly, close to the outer margin 

 of the bone. The broken fragment of the premolar in the one 

 specimen and the shape of its alveolus in the other, prove that the 



1 Loc. cit., p. 97 (79), pi. \i (ii), fig. 46. 



2 Ann. Sc. GeoL, xxi (1891), art. No. 1, p. 39. 



3 Arch. Mus. Lyon, v (1892), p. 51. 

 * Loc. cit., pi. Yi (ii), fig. 48. 



