568 MR. M. F. WOODWARD ON [May 5, 
In the lower molar the protoconid evidently develops first, but 
it is closely followed by the metaconid, the entoconid, and the 
hypoconid, the reduced paraconid being last, the order being 
identical with that seen in Hrinaceus. 
The relation of the milk and permanent dentitions may be thus 
expressed :— 
(ela 3 fel. (ee cies eka aoe ee pepe 3 
tas | | basins 
(aa wee RIP CRIOS Tee 
tip TICE a i = ya @) 3° 4 ae 
Lb 2S ee eet cd Se sae poot 
SOREX. 
The Shrews are generally regarded as possessing one dentition 
only, but both Owen (18)and Trauber (25) stated definitely that there 
was a minute calcified milk-dentition present, Owen ascribing to 
Crocidura ; milk-teeth, while Trauber states that in S. vulgaris 
there are 4 and in Crossopus fodiens * deciduous teeth. Leche 
(9) believes that these authors mistook the calcifying cusps of the 
replacing teeth for a set of minute milk-teeth—he himself coming 
to the conclusion, from the material at his disposal, that only one 
dentition is present in Sorea and Crossopus; this he regards as 
the successional set, the milk-dentition having been suppressed. 
My own observations are based on the examination of one stage 
only, but it appears to be in a very interesting condition and shows 
distinctly traces of two dentitions. 
The specimen measured 32 mm. long, the head length being 
8 mm., while from the crown of the head to the posterior flexure 
of the body it was 13 mm., being just 1 mm. shorter than Leche’s 
youngest stage. 
The Jneisors. 
nal 
Ri: 
and in my feetal specimen are much in advance of the other teeth. 
The enamel-organs of these two teeth exhibit strong lingual growths 
of the dental lamina (Plate XXV. fig. 15, d.l.), so large and 
swollen, indeed, as to suggest the development of a successor; but 
such a condition could not possibly have been overlooked for it 
would involve the replacement of a large tooth at a comparatively 
late period, whereas the only suggested milk-teeth (Owen and 
Trauber) are said to be minute. 
The 2nd upper incisor is backward in its development, but its 
enamel-organ exhibits a marked labial growth (fig. 16, di.2) ; this 
latter being swollen at its free end and slightly indented, evidently 
represented the enamel-organ of a predecessor to i. 2 in a vestigial 
condition. A similar but non-indented labial growth is found 
related to i.3 (fig. 17), this condition being repeated in connection 
These in the adult are two enormous procumbent teeth, 
