G. C. Crk'li — Strachey^s Cephalopoda from Himalaya. 115 



Palceomastodon differ in no important points from the con-esponding 

 bones of Elephas. The calcaneum, however, is less short and stout 

 than in the recent forms, the tuber calcis being more elongate ; some 

 calcanea from the Miocene of France, probably belonging to Tetra- 

 belodon angustidens, approximate most nearly to the Egyptian 

 specimen. 



A portion of the right ramus of a mandible shows that there 

 existed in the Upper Eocene beds a species of Palceomastodon 

 <ionsiderably smaller than P. beadnelli, even allowing for a very 

 wide range of individual variation in size in that species. The 

 specimen in question consists of part of the ramus and the coronoid 

 process of an immature mandible, in which m. 3 has not yet been 

 cut, although it is completely developed. M. 3 differs from the 

 same tooth in P. beadnelli in having the outer half of the third 

 transverse crest more clearly composed of two distinct tubercles, 

 and in the presence of a short fourth transverse crest separated from 

 the third by a fairly deep valley and composed of three small 

 tubercles. M. 2 is trilophodont, the anterior valley being partly 

 blocked by an accessory tubercle ; as usual in this genus, the second 

 molar is considerably larger than the first. This latter, which is 

 ali'eady considerably worn, is also trilophodont. Pm. 4 is bilophodont, 

 the anterior crest being considerably the higher. Pm. 3 consists of 

 a single high anterior cusp and a low heel. This species may 

 be called Palceomastodon minor; its dimensions compared to those of 

 P. beadnelli are shown in the following table, which in the first 

 column gives the length of the teeth in the type of P. minor, in the 

 second of those of a small individual (? female) of P. beadnelli, and in 

 the third of those of the type of that species : — 



IV. — Notes on the Cephalopoda belonging to the Strachey 

 Collection from the Himalaya. Part I : Jurassic. 



By G. C. Crick, Assoc. R.S.M., F.G.S., of the British Museum (Natural History). 



(Concluded frotn the February Number.) 



10. Ammonites soriptus (R. Strachey MS.), H. F. Blanford. 



(H. F. Blanford, in J. W. Salter & H. F. Blanford: Palffiont. Mti, 1865, p. 81, 

 pi. xvi, figs. 2a-c.) 



According to Professor Blanford the only example of this species 

 in the Strachey Collection was the fragment which he figured. 

 This is now in the British Museum collection [No. C. 5045] ; it was 

 transferred from the Museum of Practical Geology, labelled with one 

 of that Museum's labels " Oolitic : Niti Pass. Ammonites scriptus 

 (Stra.). Coll. by Col. Strachey." The figures, which are all reversed. 



