BATHMODON. 545 



•of two individuals represented by maxillary teeth, scapulae, humerus, 

 femur, tibiae, fibulae, astragalus, and cuneiform bones. I subsequently 

 obtained from the same person who exhumed these bones, both rami of tha 

 lower jaw of probably one of these individual specimens. I visited the 

 locality in 1873, and with many specimens of bones of Coryphodon latipes, 

 I obtained a humerus and a femur, agreeing with those of the Bathmodon 

 radians obtained by Dr. Hayden. 



This species is larger than the Corypliodon latipes, and is one of the 

 largest species of the family known to me. It is distinguished from the 

 3atter not only by the form of the astragalus already mentioned, but by 

 marked peculiarities in the scapula, humerus, and fibula. Those dis- 

 tinguishing the first two bones, have been noted under the head of the C. 

 ■latipes. 



The inferior premolars are all two-rooted, and form an uninterrupted 

 series. The basis of the malar part of the zygomatic arch originates oppo- 

 site the adjacent parts of the penultimate and last molars. The premaxil- 

 lary bone is massive, and with but little area for attachment with its fellow 

 in front. The incisor teeth are large, with subcylindric roots, and their 

 alveoli are well separated. The crowns are expanded transversely, with 

 convex cutting edge. 



The premaxillary bone is elongate, flat, and with a sloping superior 

 face, which rises gently inwards. The bases of the incisors stand obliquely 

 outwards. The inferior surface is flat, and the basis of the broken palatal 

 ^pine is rather small. An incisor tooth has a transversely diamond-shaped 

 crown, slightly twice concave on the inner faces, strongly convex on the 

 outer, with a faint external cingulum near the external angles. Enamel 

 obsoletely striate. 



A posterior superior premolar has a cingulum on the inner obtuse apex. 



The crest of the inner crescent, descending on each side of the apex of the 



outer, forms a cingulum-like ledge at its base as far as the angle formed by 



-the descent of the apex of the outer crescent. The outline of the crown 



of this tooth, viewed from above, is narrow cordate, with obtuse apex. 



The convexity of the outer crescent inwards is very strong, and the base 



-of the crown is externally two-lobed. Enamel striate rugose. In a more 

 35 



