Tettli in the Ceiitetidie. 529 



in specimens with dentition less far mlvanced than those at 

 present known, P.d. 3 will probably still be found. It there- 

 fore seems to me to be permissible to write the dental formula 

 of Solenodon as follows : — 



A\ Ai : : 4 



U (,2 3 4 U i^ 3 



According to this the dentition would agree with that of 

 Ort/zoryctes, MicrogaJe, and Limnogale. In comparison with 

 those of the Centetidas the milk-teeth of Solenodon convey 

 the impression of having undergone degeneration. 



Potamogale. — Nothing as yet has been published on tooth- 

 change in this rare animal. Nevertheless I confidently 

 assume that the teeth figured and described by Allman * and 

 by Dobson f as permanent ones belong to the milk-dentition. 

 Allman's specimen was not adult, and its M. 3 was still 

 hidden in the jaw, as shown by Mivart | and subsequently 

 also confirmed by Allman himself §. It may here be remarked 

 parenthetically tliat, in consequence of this, Jentink's Pota- 

 mogale AllmaniW falls to the ground. (Similarly, the den- 

 tition figured by Dobson is that of an immature specimen ; 

 according to the statement of the author referred to, M. 3 has 

 not yet protruded in this example. The solitary specimen 

 before me (Brit. Mus. no. 75, 10. 15. 4) is even somewhat 

 younger than the examples alluded to above, since not even 

 M. 2 is completely protruded ; it is therefore yet younger 

 than my specimen of Solenodon^ in which the majority of the 

 milk-teeth are still present, The molariform tooth standing 

 in front of M. 1 is more worn than the latter, and the teeth 

 in front of it are also worn — a further proof that we are 

 dealing with milk-teeth. 



B. 



The Form of the Teeth. 



The following investigation culminates in an attempt to 

 furnish an answer to the question, whether in the Centetidge 



• Trans. Zool. Soc. London, 1866, pp 1-16, figs. 7 and 8 (pp. 10, 11). 



t ' Monograph of the lusectivora,' 1882, p. 99, pi. viii. fig. 5. 



t Journ. Anat. Physiol, ii. 1868. p. 128. 



§ Proc. Zool. Soc. London, 1867, p. 256. 



II ' Notes from the Leyden Museum,' vol. xvi. 1895, p. 234. 



