614 Dr. A. Aniback-Clui.stic-Linde on the 



swollen on the lingual side of Pj. Pg and P3 are represented 

 by two bud-like swellings of the tooth-band (1*1. XV III. 



What is said about the molars in the upper jaw is also 

 true about the molars in the lower jaw, only that M3 is 

 somewhat more differentiated. 



The milk-teeth. 



The milk-dentition is highly reduced and retarded in its 

 development. It may be doubted if any of the milk-teeth 

 calcify, and probably none of them cut the gums. 



The upper jaw. 



There are two milk-incisors, viz. Id* and Id''; the former 

 is a bud-like rudiment^ the latter is cup-shaped. I have 

 found no trace of a prelacteal dentition in connection with I' 

 in Neomys. 



Predecessors of the three premolars have also been found, 

 viz. Pd\ Pd-, and Pd'. Pd^ is cup-shaped, the other two are 

 represented by bud-like structures. 



The loiver jaw. 



There arc no predecessors of the incisors in the lower jaw, 

 but vestigial predecessors of the other antcmolars have been 

 found, viz. Cd, Pdi, Pds, (Pds), I\U (PI. XVIIl. fig. 2). The 

 remainder of Pd3 consists only of a few epithelial cells. 



Summai'y. 



1. The tooth-band is continuous in the upper jaw, the con- 



nection in the middle reraaiuing. In the lower jaw the 

 tooth-band is divided into two halves. 



2. There are most probably four incisor-germs in the upper 



jaw. If this is true, the number of incisors is greater 

 than in any other monodelph with the exception of 

 Sore.v araneus. 



3. In the lower jaw there are germs of eight anteuiolars. In 



front of the large incisor there are rudiments of two 

 suppressed teeth, which proves that the ancestors of 

 Neomys once had three incisors in the lower jaw. 



4. A rudimentary canine is present in the lower jaw. 



5. Rudiments of two suppressed lower premolars, Po and P3, 



are present. It is thus proved that the full sot of pre- 

 molars once existed. 



