E. LÖNNBERG, MAMMALOGY OF ECUADOR. 83 



small particles, which have happened to stick there. This 

 median keel underneath the tongue is rather firm to the 

 touch and possesses undoubtedly a certain elasticity. It repre- 

 sents the median portion of the suhlingua. The lateral por- 

 tions of the same are present in the shape of thin plicae on 

 either side, which have free edges along that part of the 

 tongue which corresponds to the molar region, hut in front 

 they are entirely attached to the lower side of the tongue 

 itself. A similar median keel as well as lateral plicae are 

 found also in other Marsupials f. i. Didelphyidae, Dasyurus, 

 Perameles etc, but in the last genus the free edges reach 

 much further forward. The extension of the sublingual keel 

 to beyond the tip of the tongue appears, however, to be 



Fig. 5. Stomach of Caenolestes with first 

 portion of the duodenal tract. 



something characteristic for Caenolestes and serves undoubtedly 

 the purpose mentioned. 



The salivary glands are very strongly developed. Glan- 

 dula suhmaxillaris forms a flattened mäss, which reaches 

 backwards beyond the clavicle, and Gl. parotis is also very 

 large and extends backwards över the neck in a thick layer. 

 Gl. suhlingualis is comparatively very well developed along 

 the inner side of the lower portion of the mandible. 



The stomach is a short and wide säck the general shape 

 of which is shown by the accompanying figure (fig. 5). If 

 it is cut open a very different structure of the different 

 parts reveals itself. In a well defined area surrounding the 

 cardia and reaching about three fifths the distance of the 

 lesser curvature, and from the same not quite half way 

 towards the greater curvature the wall of the ventricle, is 



