Teeth in the Centetidee. 529 
in specimens with dentition less far advanced 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 :— 
2 Lee 2s 
M. 
1 4 8) 
Pp. 
Cow wto 
1 
1 
1 
ih 
Cow wld 
ae ee 
bow tw bo 
2 
2 
2 
ree 
According to this the dentition would agree with that of 
Oryzoryctes, Microgale, and Limnogale. In comparison with 
those of the Centetide 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 } 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 that, in consequence of this, Jentink’s Pota- 
mogale Allmani || 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, /. 8 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 1.1 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 Centetide 
* Trans. Zool. Soc. London, 1866, pp. 1-16, figs. 7 and 8 (pp. 10, 11). 
+ ‘Monograph of the Insectivora,’ 1882, p. 99, pl. viii. fig. 6. 
{ Journ. Anat. Physiol. ii. 1868, p. 128. 
§ Proc. Zool. Soc. London, 1867, p. 256. 
\| ‘Notes from the Leyden Museum,’ vol. xvi. 1895, p. 284. 
