■ 18 



Mr. C. Forster- Cooper on new 



oxcept that the hinder horn of the protocone is reduced and 

 doss not turn towards the middle of! the tooth. On the outer 

 side the parastyle and mesostyle are prominent and the 

 "barrels" of the paracone and metacone well marked, a 

 point of distinction from II. blandfordi (Lyd.), where they 

 are stated to be weakly developed. The metastyle is well 

 developed on the last molar, but very weak on the second. 

 This is clue to the size of the parastyle of the last molar, 

 which curls round the metastyle of the second and prevents 

 its development. It seems probable, therefore, that the type- 

 tooth of II. blandfordi, which shows a weak parastyle, is the 

 second and not the third molar. 



Fiff. 4. 



The characters of this genus, according to Lydekkei* and 

 Pilgrim "f, are (1) the absence of a protoconule, (2) a promi- 

 nent and complete mesostyle, (8) an incompletely crescentie 

 protocone. 



The genus Telmnlodon (Pilgrim) differs chiefly in its 

 greater bunodonty, in the presence of a very small proto- 

 conule, and, as far as my specimen (i. e. of Tehnatodon) is 

 concerned, in having smooth enamel. The two genera, 

 however, are closely allied. 



In addition to the form under discussion, three species of 

 Hemimeryx have been described — blandfordi (Lyd.), pusillus 

 (Merycopotamns putillus, Lyd.), and speciosus (Pilg.) ; the 

 last two are small forms, while blandfordi, if the tootii is the 

 last molar, approaches the present form more closely in size, 

 but differs in the form of the paracone and metacone. 



* Lydekker, \Wc. Geo!. Surv. Tnd. xi. \\ 80. 

 t Pilgrim, h» : . til. 



