482 DR. C. 1. FOKSYTH MAJOR ON 



verm, Hens." That this is true with regard to the CEningen specimen in the British 

 Museum has been sliown on p. 402. I can affirm the same for the Seyfried specimen * 

 at present in the Constance Gymnasium, where I examined it and found it to have 

 the characteristic ^2 of Lagopsis veriis. With regard to the Carlsruhe specimen t, 

 since the shape of its pT^ cannot be clearly made out from H. v. Meyer's figures 

 and description, the true position of this "i. ceningensis, H. v. Mey.," cannot be 

 satisfactorily determined for the present. It might quite as Avell be a Titanomys 

 Fontannesi. In the former, as well as in the specimens from Deggeuhausen, Elgg, and 

 Hohenhoven, no last molar (m. 3) could be seen ; as, however, this tooth is very caducous, 

 its absence in the fossils is not in the least conclusive ; it may have dropped out and the 

 alveolus been filled with matrix. Nor does Schlosser attacli any great weight to the 

 absence of this small tooth in the three specimens drawn in H. v. Meyer's MSS. ; 

 this, however, for reasons with which I completely disagree. " Auf das Fehlen des 

 letzten einfachen Backzahnes l)ei den drei von H. v. Meyer gezeichneten Exemplaren 

 darf wohl niclit allzuviel Gewicht gelegt werden. Es ist uicht unmoglich, dass auch hier, 

 wie bei Titanomys vise)wviens/s,im.novma\en Iviefer nur 3 zweilobige Molaren vorhanden 

 sind, und dass daher der stiftformige m. 4 " (meaning m. 3) " des Hensel'schen Originales 

 als Analogon des bei T. msenomensis abnorm vorkommenden Lobus des m. 3 " (meaning 

 m. 2) " betrachet werden muss." % 



This whole statement is somewhat vague ; the author seems to assume (1) that in 

 T. viseiioviensis both the m. 3 and the third lobe {t in my figures) of m. 2 occur only 

 abnormally; (2) that in " Zagomys veriis" the presence of m. 3 is equally an abnormal 

 occurrence. From these two assumptions the inference is drawn that mTs in the type 

 of Lagomys vents is the analogue of the equally abnormal third lobe in m. 2 of 

 T. viseiioviensis. Schlosser concludes by saying that he is almost inclined to consider 

 the presence of m. 3 as a juvenile character, and that this tooth is caducous (hinfallig). 

 This is very probal^ly true with regard to T. rlsenoviensis, and I liave myself suggested 

 it in the preceding pages. But it is decidedly erroneous witli regard to mTs of Lag apsis 

 verus, as are all the other suggestions tentatively put forward in the passage quoted. 

 With regard to T. viseiioviensis, the matter has been fully discussed above. As to the 

 mTs of Lagopsis verus, in all my specimens from La Grive-Saint-Alban, either the tooth 

 itself or its very distinct alveolus is present (PI. 37. figs. 14, 26). Deperet, too, has before 

 figured a mandibular ramus of Lagopsis verus from the same locality, showing the m. 3 § ; 

 and Biedermann has described this same tooth in specimens from Elgg. 



Prolagus. — There is no third inferior true molar, m73, in this genus ; m. 2 is composed 



of three lobes, the posterior connected with the middle one by cement, in the same 



way as the latter is with the anterior one. From this circumstance Pomel concluded — 



ust as Filhol has in the case of Titanomys — that in 'Prolagus m. 3 had become fused 



with m. 2. Of the Prolagus ceningensis of Sansan, he says : — " Ceux de Sansan different 



* H. Y. Meyer, " Fossile Siiugetliiere, etc., vou Giuingen,'' Fauna d. Yorwelt, p. 6, pi. iii. fig. 1 (184.5). 



t Ih. pi. ii. fig. 1. 



t Oj). cit. p. 32. 



§ Arch. Mu8. Lyon, iv. p. 104, jjl. xiii. figs. 10, 10 ct (1887). 



