Teeth in the Centetide. 541 
occupies the entire breadth of the tooth. Lastly, a slight 
internal tubercle (‘ metaconid’’) also occurs. P.2 differs 
from P.d. 2 to a not inconsiderable extent ; the latter is elon- 
gated, with a strongly developed anterior basal cusp, and 
possesses an accessory cusp situated on the same level as the 
“‘metaconid” (but on the outer side of the main cusp), than 
which it is sometimes rather more, sometimes rather less 
strongly developed. The dimensions of P.3 are variable, 
but this tooth is always smaller than P.2,; an anterior basal 
cusp is indicated now and then, and sometimes an accessory 
cusp in addition, behind and below the main cusp. The 
latter is on P.d. 5 sometimes of really considerable bulk; and 
almost as strongly developed as on P.d. 2 ; cn other specimens 
no trace of it is to be seen. Occasionally, even on perfectly 
fresh teeth, there is no vestige whatever of an anterior basal 
cusp in the case of P.d. 3 (cf. Leche, loc. cit. p. 519). 
These variations, as well as the similar ones in teeth 
belonging to the upper jaw, suggest the idea that we have to 
deal with more than one species. I may add that I assume 
the existence of two species of Centetes tor reasons other than 
those advanced by Bardeleben, but I cannot here enter further 
into this question.—All three milk-incisors show, as do their 
successors, a posterior basal cusp. 
Microgale.—P.1 alone is molariform, and consequently 
provided with an internal cusp (‘‘metaconid”’), which is 
wanting in the case of the two anterior premolars, but, in 
the majority of species at any rate, is still present on P.d. 2. 
P, 2 is somewhat larger than P.3, but in other respects the 
two teeth are alike: they are secodont, with a median main 
cusp, an anterior and posterior basal cusp, and two roots. It 
is only in the case of J. pusilla that P.3 has a single root 
and is similar in build to the C., 7. e. not elongate, but 
shortened and inclined obliquely forwards; the anterior cusp 
is indicated only by a slight indentation in the margin, which 
occurs high up near the main cusp. As regards the form of 
P.3, M. longicaudata forms a transition between J. pusilla 
and the remaining species (JZ Dobson, Thomast, Cowant, 
gracilis, and longirostris) . 
Oryzoryctes—In the build of the lower premolars this 
genus agrees essentially with Mécrogale. In comparison with 
P.2, P.3 is somewhat simplified, owing to the tact that the 
basal cusp is absent or scarcely indicated. A characteristic 
feature in the dentition of Oryzoryctes is the unusually large 
and powerful (. in both upper and lower jaws ; in the case of 
