73 



loid process completely inclosed in a canal by the lateral 

 extension of the hase of the bony meatus auditorius. 



ANTILOCAPRIDAE. (XXXII.) 



ii. Skull with the auditory bulla little produced downwards and 

 applied only to the inner surface of the paroccipital process. 

 Styloid process directed downwards, interposed between the bulla 

 and paroccipital process, and not inclosed in an oblique fold of 

 the auditory bulla. Palatine axis nearly parallel with the oc- 

 cipito-sphenoid axis. (Booidea cerviformia.) 



One family. CERVIDAE. (XXXIII.) 



2. Placenta diffuse. Stomach tripartite, the psalterium being unde- 

 veloped. Incisorial series of lower jaw interrupted at symphysis, (the 

 middle incisors very enlarged and expanded towards their crowns.) 

 (Pecora tmyuligrada traguloidea.) 



One family. TBAGULIDAE. (XXXIV.) 



3. Familiae incertae sedis. 



a. Skull broad behind, in front of the molars contracted forwards, 

 with the facial portion produced downwards and abbreviated, and 

 with the nasal bones abbreviated and longitudinally arched. 

 Molars (M |-, PM |,) broad ; inner crescentic plates of enamel run- 

 ning zig-zag-wise in large sinuous flexures. Horns in two pairs. 



SIVATHERIIDAE. (XXXV.) 



b. Skull with the parietals and supraoccipital extended far back- 

 wards, and contracted forwards in front of the molars, with the 

 facial portion normally produced. Molars (M f , PM J,) broad ; 

 inner crescentic plates of enamel describing a simple curve. Horns 



none, (in both sexes ?) 



HELLADOTHERIIDAE. (XXXVI.) 



C. Hind limbs with the proximal joint (femur) not exserted, but inclosed 

 within the common integument (Inferential). Canines of lower jaw 

 similar to and parallel with the incisors. Incisors all (I 3-3) persistent 

 in upper jaw. (M f, PM |, C i, I f x2=44.) Placenta diffuse (Inferen- 

 tial). Stomach tripartite, the psalterium being undeveloped (Inferen- 

 tial). (Pecora dentata.* 



1. Teeth of both jaws in an interrupted series, the canines of the upper 

 jaw being enlarged, and the first premolar of the lower caniniform, and 

 received in diastemas of the opposite jaw. (Oreodontoidea.) 



OEEODONTIDAE. (XXXVII.) 



3. Teeth of both jaws in a nearly or quite uninterrupted series, the 

 canines and first premolars of neither jaws projecting. (Anoplothero- 

 idea.) 



a. Body somewhat cerviform, with the hind limbs little longer than 

 the fore, (having the relative length normal to walking quadru- 

 peds.) Teeth comparatively uniform. 



ANOPLOTHEKJIDAE. (XXXVIII.) 



