FOSSIL AND EECENT LAGOMORPHA. 441 



palnte in Lepus valdariiensis, Weith. *, from the Upper Pliocene of Tuscany, and 

 in three existing Leporines, Lepus hispidus. Pears., from the foot of the Himalayas, 

 L. Netscho'i, Schleg. & .lent., from Sumatra f, and Romerolagus Nelsonl, Merr., from the 

 Popocatepetl (Mexico) %, all three of which have other generalized characters in common 

 with each other and partly with Palceolagns. 



Description of Original Specimens. 



1. Tiie Rott Skeleton. —In. its present condition, of the two anterior lower cheek-teeth 

 described and figured by H. v. Meyer, only tlie imprint is i^i'eserved, with the exception 

 of the anterior half of the front tooth, which is still in place. Prom what can still be 

 seen, and with the help of H. v. Meyers description and figures, there remains not the 

 slightest doubt that these two anterior teeth belong to the deciduous set, since they 

 bear the characters oi milk-teeth, viz., a short crown and (two) long roots, much 

 diverging from each other dowuAvai'd. The number of teeth in front of the tw^o 

 posterior in the npjier jaw is left uiuiertain in the figures and text of the original 

 memoir. A close examination shows tliat there are three of them : the first apparently 

 is provided with a stouter internal and a somewhat weaker external root ; the two 

 following with one internal and two smaller external roots, the latter strongly diverging 

 from the shaft in opposite directions. Here, too, Ave have the characteristic features of 

 milk-teeth, of which there are consequently three upper in Titanomgs, as might have 

 been anticij)ated by analogy to Fj-olagiis. The immature condition of the specimen 

 can be fiu'tner inferred from the fact that the two posterior teeth, viz., the fourth 

 and fifth in ihe series, are not yet on the same level with the three iu front of them. 

 As these two posterior teeth are broken at their lower ends, nothing can be stated as to 

 their roots. 



Still less — and this applies to all the teeth of the Pi,ott specimen — can be made out 

 about the pattern of their tritur.itiug surface, which, as noticed already by H. v. Meyer, 

 is concealed iu the matrix. This deficiency is partly supplied by some teeth from the 

 type-locality of Weisenau, in the British Museum. 



2. Titanotnys risenoviensisfroin Weisenau. — A fragment of the right upper jtiw from the 

 Lower Miocene of Weisenau, iu the Geological Department of the British Museum (21495), 

 PI. 36, fig. 19, shows the two posterior piemolars, p.l, p. 2, and part of the alveolus of 

 the anterior jiremolar, p. 3. These upper teeth were seen by Gervais, who alludes to 

 them §, contenting himself with the above-reported general remarks. The first of the two 

 premolars preserved, p. 2, at once calls to mind by its general form the anterior upper 

 premolar, p. 3, of Lepus, and to it therefore may be justly applied Gervais' remark 

 referring to all the ujjper teeth in London, viz., that they are " assez semblables a celles 

 des Lapins." The general outline of this tooth is somewhat triangular, the broader basis 

 heing on the inner side, which is imperfectly divided by a slight notch into two abraded 



* Jabrb. k.-k. geol. Eeichsanst. vol. xxxix. p. SO (1889). 

 t ' Notes from the Leyden Museum,' vol. ii. note sii. p. 5'> (18S0). 

 J Proc. Biol. Soc. Washington, s. pp. 160-174 (1896). 



§ Zool. et Pal. Fran,:;. 1st ed. t. ii. expl. no. 46 (1848-52) : 2nd ed. p. 50 (1859). 

 SECOND SERIES. — ZOOLOGY, VOL. VII. C2 



