62 



DR. B. C. A. WINDLE ON THE 



[Feb. 1, 



excessively small points, each of which fits into a corresponding 

 depression in the alveolus (vide fig. 6, c). 



The second upper molar looks like one of the divisions of the 

 first with an additional cusp attached to its antero-internal corner. 

 It has three roots, two posterior with their surfaces placed external and 

 internal, and one anterior with its surfaces anterior and posterior. The 



Fig. 6. 



Eydromys chrysogasfer : a, lotver jaw ; h, upper jaw ; c, upper molar (enlarged). 



Fig. 7. 



oe. 





Stomach of Hydromys chrysogaster : oe, cardiac orifice ; ^y, pyloric orifice. 



lower incisors (vide figs. 5, 6, a) are of greater length (1*55 cm.) and 

 of about the same breadth, hut of less thickness (0'25cm. as compared 

 with 04 cm.) than the upper. Their power of approximation, due to 

 the mobility of the two halves of the inferior maxilla, has already been 



