SCIENTIFIC RESULTS OF THE MAMMAL SURVEY. 415 



broadened anteriorly nor specially narrowed or roofed in. Bullse of 

 medium size. 



Incisors simple, witliont trace of the notch on the working edge 

 characteristic of Mus and Leggadilla. Upper molars in their 

 respective proportions as in IIics, m^ being decidedly longer than m^ 

 and m^ combined. Bnt in structure they more resemble those of 

 Epimijs, both in general appearance and the fact that the inner 

 tubercle of the first lamina is but little displaced backwards. 

 Antero-external secondary tubercle on nr extremely minute, 

 practically absent and entirely absent on m\ 



External characters not peculiar. Fur fine, liberally mixed with 

 spines. Ears of average size. Hindfoot with the fifth toe reaching 

 nearly to the middle of the basal phalanx of the fourth ; surface of 

 sole between pads granulated, behind them smooth; sole with six 

 distinct elevated pads, the last slightly longer than broad. Mammse 

 probably 3 — 2^10 (there are certainly three, and only three, 

 pectoral pairs, and as both Mtts and Leggadilla, with either three or 

 four pectoral, have two inguinal pairs, the great probability is 

 that Goelomys has., the same number, but they cannot be made out on 

 the specimens available). 



Genotype : Ocelomys mayori, sp. n. 



This genus is of a remarkably central and annectant character, 

 having nothing in any way special about it, but merely a mixture of 

 the characters of the other genera, of the group. It is impossible 

 on the one hand to put the species into any one of the older genera, 

 and on the other to name any single character peculiar to it. 

 Even its molars show this mixture, having the relative proportions 

 of those of Mtts, while the structure is more as in J^J^mnys. 



To show its position we may take Wroughton and Ryley's 

 synopsis of the Indian genera of Murid£e|, and, commencing next 

 below Ajpodemus, alter it as follows : — 



h^ Postero-internal cusp of upper molars absent. 

 ct*. M^ longer than m^ and m^ combined. 

 a\ Bevelled edge of incisors notched. 

 Palatal foramina penetrating deeply 

 between the molars. 

 a^ Frontal ridges well marked ... Leggadilla. 



6^ No frontal ridges ... ... ...Mils. 



h\ Bevelled edge of incisors not notched. 

 Palatal foramina shorter. No frontal 



ridges ... ... ... ... Goelomys. 



&*. M^ equal to or shorter than m^ and m^ combined. Incisor 

 edges not notched. Frontal ridges present, 

 a'. Front edge ... ... ... &c. 



X Journ. Bom. N. H.. Soc. 1913, p. 20. 



