18/1.] MR. ST. GEORGE MIVART ON HEMICENTKTES. /5 



orbital process; occiput not sloping much forwards; prsemaxillfe 

 peculiarly produced ; lambdoidal ridge traversing summit of cra- 

 nium ; no ridge or process in front of orbit ; a tympanic bulla ; no 

 alisphenoid canal ; no pterygoid fossa ; no paroccipital process ; 

 glenoid surface very small ; ascending ramus of mandible very low, 

 peculiarly truncated ; coronoid process very low, a carotid foramen ; 

 a small glenoid foramen ; spbenoidal fissure and foramen rotundum 

 represented by one opening ; infraorbital foramen large and single ; 

 lachrymal foramen minute ; true molars each in the form of a tri- 

 angular prism ; first upper incisor larger than the second ; canine 

 small. Nineteen or twenty dorsal vertebrae ; cervical neurapophyses 

 not very narrow antero- posteriorly ; no cervical hypapophyses ; 

 spines of dorsal and lumbar vertebrae well developed ; no hyperapo- 

 physes ; no hypapophysial ossicles beneath the lumbar vertebrae ; 

 manubrium slightly keeled, but not much enlarged ; clavicles long 

 and very slender ; humerus not very short ; ulna complete and di- 

 stinct ; scapula broad, with a blunt metacromion ; scaphoid and 

 semilunar distinct ; no sickle-shaped carpal ossicle or os interme- 

 dium ; pelvis widely open below ; tibia and fibula anchylosed 

 together inferiorly ; four digits to manus, five to pes ; no caecum ; 

 an ossified tendon in the forearm. 

 Hub. Southern and Eastern Africa. 



Chrysochloris, Lacepede. 



M. 3^; a vesicular enlargement in the temporal fossa; lower 

 molars without any posterior process. 



Chalcochloris, St. G. Mivart. 



M. ~~ ; no enlargement in the temporal fossa ; lower molars 

 with a marked posterior process. 



Talpid^e. 

 C. — ., M. jj^. Cranium very broad behind, but not high ; taper- 

 ing much, but gradually, forwards ; greatest breadth behind the 

 posterior roots of the zygomata, which are complete but exceedingly 

 slender arches ; occiput inclined much forwards ; no postorbital 

 process ; no ridge or process in front of the orbit ; temporal fossa 

 small ; a tympanic bulla ; no alisphenoid canal ; mesopterygoid 

 fossa not ending posteriorly in any excavation of the basis cranii ; 

 foramen magnum very large ; no paroccipital or mastoid processes ; 

 glenoid surface small, and situated high up ; no distinct postglenoid 

 process ; ascending ramus of mandible not very low ; supraoccipital 

 enormous ; generally a large pterotic ; meatus auditorius extemus 

 opening decidedly below the glenoid surface ; a carotid, but no 

 glenoid foramen ; foramen rotundum and spheno-orbital fissure re- 

 presented by one opening ; infraorbital foramen very large ; lachry- 

 mal foramen very small ; molars above and below, each formed of 

 two triangular prisms. Cervical neurapophyses very narrow antero- 



