CHALICOTHEEIUM SIVALENSE. 225 



Inches 

 Length of p.m. 2 

 Ditto of p.m. 3 

 Ditto of p.m. 4 

 Ditto of true m. 1 (middle) 

 Ditto of true m. 2 (outer) 

 Ditto of true m. 3 . 



P.m. 2 is the least worn of all — compressed ; no disc of pressure in 

 front. 



P.m. 8 lias crown mutilated both sides. 



P.m. 4 shows the two crescents, as in rhinoceros : crown well worn. 



T.m. 1, or antepenultimate, is very much worn: crescents confluent. 



T.m. 2, (penultimate), also well worn ; crescents confluent and yielding 

 cordate discs. 



True m. 3, less worn, discs nearly confluent, somewhat reniform in 

 character. 



All these molars show a distinct basal bourrelet outside at base. 



The diasteraal ridge nearly entire on left side, very sharp, and shows 

 not the slightest indication either of a detached first premolar or of a 

 canine. Further, the left half of the incisive border present and CfU- 

 tire, without the slightest trace of either incisive teeth or their alveoli. 



The symphysis commences in a line with the posterior third of p.m. 3, 

 and the total length of symphysis to incisive border is about four 

 inches, or a little more. 



The diastemal ridges rise into a sharp edge, leaving between a 

 deepish gutter or spout, which expands a little as in the ScAvalik species 

 towards the incisive border — but only a little. 



The most remarkable character of all is, that the lower surface of the 

 symphysis is contracted forwards into a sharp keel as in a boat, which 

 terminates suddenly at 2'7 inches in front of the anterior premolar, and 

 then the short incisive margin projects forwards to its slight expansion, 

 without a trace of this keel ! showing a very remarkable edentate cha- 

 racter. Nothing of this keel seen in the Sewalik species, and it is very 

 different from Lartet's specimen, called Chalic. Lartetii by Kaup. 



Certainly no lower incisives, as in Lartet's jaw. 



On the Inconvenience of Eetaining the Dichobunes in 

 Anoplotherium. 



Great inconvenience arises from retaining the DtcJiobunes in Anoplo- 

 therhmi, and quoting the species under the name of that geniis, the 

 true Anoplotlieria being allied to rhinoceros in their dentition with 

 the natatory habits of the otter in the case of A. commune, while some 

 of the species ranked under Dichohune are nearly indistinguishable from 

 the musk deer. Such heterogeneous materials are too much for the 

 limits of any genus. Cuvier considered his arrangement of them as 

 merely provisional — ' Lcs deux especes suivantes (J., murinum and A. ob- 

 liquwn) sont encoi-e plus douteuses, car il ne serait pas impossible qu' elles 

 appartinssent a de petits ruminans, et toutefois jusqu' a ce qu'on en 

 ait la preuve rigoureuse, on puit les laisser dans les Anoplotheriums, au 

 moins pour la nomenclature." Cuvier even regarded A. leiwrinum as a 

 provisional name only (Ossemens Fossiles, tome iii. p. 70). The incon- 

 venience alluded to lias been felt in the case of Mr. Pratt's fossil, from 



VOL. I. Q 



