Iy93.] Du. c. J. roRsrxu majoe oy MiocEyji; s^ii'iRiiELS. l9l 



Si: sj.H'riiwj)hilini(s is represented by a fragment of the left 

 maxilla ( Plate X. fig. 4), carrying the posterior premolar and the 

 two anterior molars, and by several mandibular rami (Plate X. 

 tigs. 6-9). A minute alveolus for p., is visible in front of the 

 posterior upper premolar. The inferior molars show the cup- or 

 ba.sin-shaped conformation, the cusps being ai-ranged laterally. 



Deperet is of opinion that the molars of >Sc, sioermopliilinas 

 diiFer from Sc vah/aris only in small particulars. I find more 

 resemblance to some Oriental members of the subgenus Scianis ; 

 the autero-iuternal cusp of the lo\A'er molars being extremely 

 elevated, whilst the postero-internal cusp is almost suppressed 

 (Plate X. fig. 9). We meet with exactly the same pattern in the 

 Oriental Sc atrodorsalis, Gr., Sc. rosenhergi, Jent., Sc. ccmiceps, Grr., 

 ^V. hrookt'i, Thos., and others. The third lower molar is more 

 elongate than in Sc. vulgaris; this, too, is a character of the 

 Oriental group of tSquirrels mentioned. Besides, both upper and 

 lower incisors are ^■ertically striated by ridges (Plate X. fig. 5). 

 Amongst recent Sciarincp., only BJdthfosclwus, whose molars, how- 

 e\er, are very different from those of the fossil, presents this 

 character. It occurs also on lower incisors of some species of 

 Scii(roiJcs from Cailux, in the British Museum. As the same 

 striation of incisors is found in the Tillodont Galamodon of the 

 Lower American ^ and Swiss " Eocene, it may prove to be an 

 inherited character. 



Length of m.,, m^, p, sup., G millim. ; length of m., m.,, m^ p. 

 inf., 7'5 millim. 



Xerus (jrivmsls, n. sp. (Plate X. figs. 2, 3). — A left mandibular 

 ramus, showing the three molars and the alveolus of the pre- 

 molar. Length of the three molars 6 millim. Incisor without 

 \ertical ridges. The molars present a n)ore advanced stage of 

 lophodontism than those of Sc. spermoj^liUiims, not only the 

 anterior cusps uniting transverselj', but the postero-external and 

 postero-internal cusp — the latter more fully developed than in 

 Sc. spcrmoplnliiius — showing the same tendency. So that we 

 have three, instead of two, trans\'erse valleys, the median and 

 posterior valley being incompletely divided. I could not better 

 characterize the molars of this fossil than by calling them a 

 minute and somewhat less semi-hypsodont form of X. herJinord, 

 Bly., from ^Tartaban, Tenasserim, Cambodja, and Cochin-China. 



Scluropkrvs alhaacusis, u. sp. — The third fossil, a left ramus of 

 the lower jaw (Plate X. fig. 1, Plate XI. figs. 3-5), is strikingly 

 similar in (lie character of the molai-s and the ramus to some of 

 the larger species of Sc'mropknn^, and especially to Ptcromjs tephro- 

 mdas, Gunth.^ (Plate XL figs. 1, 2), aud Ptcr. phaomelas, Giiuth., 



' E. D. Cope, " The Vertebrata of the Tertiary Formalious of the West," 

 Book I. 1883 (Rep. Un. Stiites Geol. Surv. of the Territ. voh iii., Washington, 

 1884) pp. 188-192, pi. xxiv.c. fig. 1 b. 



■^ L. Riitinieyer, " Die Eocane Siiugethierwelt von Egerkingen " (Zurich, 1891), 

 pi. viii. fige. 25-27, p. 12G. 



' Proc. Zool. Soc. Lond, 1873, p. 413, 1880, p. 53. 



