260 MARSTJPIALIA. 



malia,' pi. iv. figs. 7, 8 ; it shows the third incisor, the 

 canine, the first three premolars, mm . 4, m. 1 and m . 2, the 

 impress of m73 on the limestone, and mTl on the inner 

 side of the coronoid process. Since the specimen was 

 figured, the outer lamina of the ramus- has been cut away 

 to exhibit the germ of pm. 4 in alveolo. The length of m. 1 

 + ^T~2 is 0,005, and that of mTT + mT2 + m73 0,008. The 

 position of m. 4 on the inner side of the coronoid indicates 

 that this tooth may be present in No. 47766. 



Beetles Collection. Purchased, 1876. 



48395. The imperfect mandible of an immature individual, appar- 

 ently showing pm. 2, pm. 3, mm. 4, m. 1, and m72. 



Same history. 



The following specimens not improbably belong to this species. 



47771. Part of a right mandibular ramus, containing three true 



(Fig.) molars. Figured by Owen, op. cit. pi. iv. fig. 6 (as T. (?) 



minor). Same history. 



47784. Fragment of the right maxilla, containing the last true 

 (Fiy.) molar. Figured by Owen, op. cit. pi. iv. fig. 5. 



Same history. 



47768. Fragment of the right mandibular ramus of an immature 

 (Fig.) individual, showing p"m74 half protruded from its alveolus 



and the imperfect m Tl and m72. Figured by Ow.en, op. 



cit. pi. iii. fig. 15. Same history. 



Triconodon ferox, Owen \ 



Syn. (?) Triconodon occisor, Owen 2 . 



Distinguished from the preceding species by its superior size and 

 the contour of the angle of the mandible. None of the specimens 

 show any trace of mTl. The length of mTl + m?2 in the type 

 specimen is 0,008, and that of mTl + mT2 + mT3 0,013. 



ffab. Europe (England). 



The following specimens ivere obtained from the Middle Purbeck 



group of Durdlestone Bay, Swanage, Dorsetshire. 

 47775. The nearly entire left ramus of the mandible, containing 

 (Fiy.) the canine, the broken base of m77, the remaining three 



1 Mesozoic Mammalia (Mon. Pal. Soc.), p. 64 (1871) 

 7 Rid. p. 69. 



