602 Dr. A. Aniback-Cliristie-Iiinde on the 



answer to these questions and at the same time to get a clue 

 to the phylogeny of the Soricidae. 



I have examined the following shrews by means of serial 

 sections : — 



Sore.r araneus : 3 stages. 



I. Foetus: head-length about 8 mm., body-length* about 11 mm. 

 3 specimens. 



II, Foetus: head-length about 9 mm., body-length about 13 mm. 

 3 specimens. 



III. Very young, almost hairless Sore.v : head-length about 19 mm., 

 body-length about 33 mm. 



1 specimen. 



Neoinys ( Crossopus) fodie7is : 1 stage. 



Foetus : head-length about 9 mm., body-length about 17 mm. 



2 specimens. 



Crocidura russula : 3 stages. 



1. Foetus: head-length about 8 mm., body-length about 12A ram. 

 2 specimens. 



II. Foetus: head-length about 8 mm., body-length about 12 mm. 

 2 specimens. 



III. Foetus: head-length about 9 mm,, bodj^-length about 12Amm. 

 1 specimen. 



F(vtal specimeii of a shrew (probably Crocidura) : body-length about 

 10 mm. 



The above measures have been taken on preserved specimens. 

 The results of my investigation o£ the tooth-devclopraent 

 of Sorex araneus may be thus expressed : — 



PPPI'P C P' P- P' P* M'M-M' 



Id'' Id^Id' Cd Pd' Pd- P d^ Pd^ 

 Id, — Pd, Pd2 — Pd. 



I, 1. 13 1, (C) P, P, (P3) P. M, M.. ^r,. 



In giving the tooth-formulas of tlie other shrews which 1 

 have Investigated I have used the same designation for teeth 

 which are probably homologous. 



The reconstructions of the ectodermal parts of the teeth 

 are made by Dr. N. Odhner, whose reconstructing method 

 is described in Anatoni. Anzeiger, Bd. xxxix. 1911, p. 273. 



* I have taken this measure from the crown of the head to the poste- 

 rior llexurtT of the bodv. 



