256 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXV. 



smaller than the first upper premolar it is very rarely absent (in one 

 skull only, among 134; this individual is not very old, little more 

 than 2^ years) ; it shows stages of wear, being acted upon, in 

 certain positions of the jaw, probably by the tip of the upper 

 canine. Of all teeth the lower incisors are the least affected by 

 wear ; I fail to see that they can possibly come into contact with 

 any other teeth ; even in the oldest individuals their edge very 

 often, perhaps as a rule, remains trilobed. 



In the imworn and little worn stages, the highest cusps in the 

 upper molars are those in the middle row (4 and, even more, 5), 

 in the lower molars the anterior outer cusp (4). The upper molars, 

 therefore, slope from the middle outward, while the lower molars 

 are highest at their outer side anteriorly. 'I'his is completely alter- 

 ed by the wear of the teeth. Owing to the fact that the lower 

 tooth rows are much closer together than the upper, the lower 

 molars act most vigorously on the middle and inner portions of the 

 upper teeth, and the upper molars most strongly on the outer side 

 of the lower teeth, with the result that in the final (fifth) stage of 

 wear, when the molar surfaces are nearly or quite flat, the upper 

 molar surfaces slope strongly and evenly from the outside inward, 

 the lower molars from the inside outward. 



Ages o/'104 individuals of RhinolopJms rouxi. 



Subjoined are the details of all the dated specimens examined. All 

 except seven were collected by Mr. Shortridge for the Mammal 

 Survey of India. 



1. October and November individuals. 



28 specimens (all adult females), Seringapatam. S. Mysore, 18th 

 and 19th October, 1912. 12 specimens (4 c^' ad., 8 5 ad.), Devi- 

 kop, 26 miles south of Dharwar, S. Mahratha Country, 21st and 

 25th November, 1911. The November specimens are marked with 

 an asterisk. Total number, 40. 



Stacfe I (about 6 months old). — 10 individuals, G.C.S, 1943, 

 1947,1948, 1949, 1950, *137, *139, *141, *174, *177. 



Stage II (about 18 months old).— 12 individuals. G.C.S. 1936, 

 1939, 1954, 1955, 1957, 1958, 1959. 1960, 1962, *134, *138, 

 *178. 



Stage III (about 2^ years old). — 7 individuals. G.C.S. 1934, 



1937, 1946, 1956, 1963, *179, *181. 



Stage IV (about 3^ years old). — 7 individuals. G.C.S. 1935, 



1938, 1944, 1961, *14^, *180. 



Stage V (about 4-^ years old), — 5 individuals. G.C.S. 1940, 

 1941, 1945, 1951, 1964. 



