108 



lb. Intestinal canal without a csecum. (Pubic symphysis very slight or null.) 

 2fl._Molar teeth in part (M., 2; M., 1 ; Pm., 4 ; Pm., 3) quadricuspid, 

 with the antero-internal cusp higher than the postero-internal ; true mo- 

 lars (M., 2 ; M., 1) with the postero-external cusp connected by a ridge 

 with the one between the antero-internal and the postero-internal cusps 

 at the re-entering angle of the latter. Skull with the clavarium oblong, 

 oval, broadest between the roots of the zygomata ; with the foramen 

 magnum triangular ; the occipital condyles very divergent ; with par- 

 occipital and mastoid processes distinct. Pelage more or less harsh or 

 spinigerous. ( Erinaceoidea. ) 



ERINACEIDAE. 

 26. Molar teeth multicuspid, with the cusps connected by deep re-entering 

 ridges, which describe two elongated triangles, and with at least an ex- 

 tensive antero-internal ledge or cingulum. Skull with the calvarium 

 wide; broadest about the periotic region; -with the foramen magnum 

 subcircular or oblong ; the occipital condyles variously divergent ; with 

 the paroccipital processes obsolete or wanting. Pelage very soft. 

 (Soricoidca.) 



3a. Skull with the posterior ridges obsolete ; with the foramen mag- 

 num oblong and inclined far forwards below; with no distinct posl- 

 glenoid process ; with the tympanic element forming a bulla ; infra- 

 orbital canal an extensive transverse aperture, arched over by a 

 very narrow osseous bar ; zygomatic arch a slender rod ; lower jaw 

 with the ascending rami erect and without cavities at the bottoms 

 of the coronoid processes. Teeth : molar with the postero-inter- 

 nal ledge obsolete or wanting. Vertebrae : cervical with no hy- 

 papophyses ; dorsal and lumbar with no hyperapophyses. Ste\-- 

 num with manubrium broad and keeled. Anterior members de- 

 veloped more than the posterior; with carpus more or less enlarged, 

 and at least with an os intermedium. Scapula long and narrow. 



TALPIDAE . 



36. Skull with the posterior ridges well developed ; with the foramen 

 magnum subcircular and inclined little forwards below ; with a well- 

 developed post-glenoid process ; with the tympanic element annular, 

 not forming a bulla ; infraorbital canal a rather long subcylindrical 

 tunnel, covered by a very broad osseous wall ; zygomatic arch not 

 developed. Lower jaw with the ascending rami deflected out- 

 Avards and each with a cavity at the bottom of the coronoid pro- 

 cess. Teeth : molar with a postero-internal ledge armed with a 

 cusp at its antero-internal angle. Vertebr£e characteristic ; cervical 

 with well-developed hypapophyses ; dorsal and lumbar with distinct 

 . hyperapophyses. Sternum with manubrium broad but ecarinate. 

 Anterior members more slender than the posterior ; with carpus nor- 

 mal, having no sickle-shaped bone oros intermedium ; scapula short 

 and broad. 



SORICIDAE. 



II. Molars (i. e., true molars) narrow; upper each with a homogeneous, (or, as in 

 Potamogalidse, with an incomplete secondary area, ) forming a triangular prism 

 narrowed inward ; lower simple (e. g., Chrysochloridee) or with two very unequal 

 portions. 

 la. Skull cylindrical or cylindro-conic, broadest between the glenoid surfaces. 

 Malar bones absent. Tympanic bullse none. Paroccipital processes devel- 

 oped. Carotid foramen none. Pelage more or less harsh. {Centetoidea.) 

 2a. Skull more or less cylindrical ; with a lachrymal foramen whose mouth is 

 close to the inner margin of the orbit ; with no suboptic foramen. Teeth 

 variable (I., ^5^; C, |; Pm., |e|-; M., f X 2) ; the upper molars form- 

 ing, severally, triangular prisms, single internal principal cusps only 

 being developed ; lower molars with very small posterior cuspidate ledges. 

 Scapula with an obtuse metacromion process. Clavicles developed. 

 Tibia and fibula sejiarate from each other entirely. 



CENTETIDAE. 



26. Skull cylindro-conic ; with no lachrymal foramen ; with a suboptic 

 foramen. Teeth : I., f ; C, -j- ; Pm., f ; M., | X 2= 40 ; the upper 

 molars presenting, severally, incompletely divided triangular prisms, 

 two principal internal cusps being developed ; lower molars with quite 

 large posterior ledges or areas. Scapula without a metacromion process. 

 Clavicles suppressed. Tibia and fibula anchylosed together at their distal 

 extremities. 



POTAMOGALIDAE, 



