1328 



PETER VOGEL 



PT 30-40. For the extrême ontogenetic forms of Metha- and Eutheria we propose 

 the term "primitive nidicolous type", for the typical Eutherian nidicolous forms 

 the term "evolved nidicolous type". 



So far as the known facts allow a judgement, ail the Soricinae are of the 

 primitive, ail the Crocidurinae are of the evolved nidicolous type. Thus a new j 

 criterion is found that justifies the contested subfamilies of the Soricidae. A study 

 of other Eutherians shows that primitive nidicolous types probably exist among 

 the Talpidae. The ontogenetic features of Sorex and Neoinys proves that the birth 

 situation of the Proto-Eutheria was similar to that of the récent Marsupials. 

 The family of the shrews is an actual model for the first step in évolution from 

 the primitive to the evolved nidicolous forms. 



LITERATUR 



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