iroiAN TERTIAET AID POST-TEDTIADT VEDTEBMTA. 
MASTODOI TEETH EDOM PEDIM ISLAND. 
By R. LYDEKKER, B.A., F.Q.S., F.Z.S. 
(WITH PLATES XVI. AND XVII.) 
INTRODUCTORY. 
Since the publication of the description of various remains of Mastodon pandonis 
and M. angustidens in an earlier part of this volume^ the present writer has been 
favoured with the loan of several teeth of mastodons from the Siwaliks of Perim 
Island, in the Gulf of Cambay, which were collected by Mr. Wajeshankar Gowree- 
shankar of Bhaonagar, Guzerat. As some of these teetli differ, either in form or in 
their degree of wear, from previously described specimens, and as it is only by 
describing a large series of specimens that we can hope to arrive at anything like a 
complete knowledge of the dentition of the Siwalik mastodons, the writer is glad to 
have the opportunity of describing these interesting specimens, and at the same time 
ventures to express the hope that they are not the last that he will receive from the 
same source. In addition to these specimens a tooth from Perim Island, now in the 
collection of the British Museum, and another collected by Mr. F. Fedden, of the 
Geological Smwey, in the same locality, are also described and figured. It may be 
added that Mr. Gowreeshankar’s specimens are those briefly noticed on page 134 of 
the present volume. 
Mastodon pandionis, Falconer. 
First upper true molar . — In figures 2, 2a of plate XVII. there are given two 
views of the crown of a perfect germ molar of a trilophodont mastodon. The 
convexity of the crown, and its relative shortness indicates that the specimen 
probably belongs to the upper jaw, and the position of the columns proves that it 
belongs to the right side. The size of the tooth indicates that it is probably the 
first true molar. 
1 Pages 17-32, plates IV. -V. 
