68 MR. ST. GEOKGE MIVART ON HEMICENTETKS. [Jail. 17, 



posteriorly ; no hyperapophyses ; hypapophyses beneath lumbar ver- 

 tebrae ; scapula with a long metacromion ; clavicles slender ; internal 

 condyle of humerus perforated ; scaphoid and semilunar separate ; 

 pelvic symphysis elongated ; metatarsus as long as, or longer than, 

 digits, and much longer than tarsus ; sometimes only four digits ; a 

 caecum. 



Hab. Africa. 



Macroscelides*, Smith. 



Dentition: I.f=§, M. f^f or |=|. Skull sometimes much inflated 

 bv air-cavities, always much contracted between orbits ; no post- 

 orbital process ; large defects of ossification in the palate ; ptery- 

 goid fossa extending forwards to posterior margin of palate ; suboptic 

 foramen not conspicuous ; infraorbital canal very short, the lachry- 

 mal foramen opening immediately above posterior termination of 

 infraorbital canal ; angle of mandible elongated ; upper incisors and 

 canines all of much the same size ; third incisor with a single root ; 

 third lower molar but little smaller than the first or second. Six or 

 seven lumbar vertebrae ; cervical spines very rudimentary ; ulna an- 

 ehylosed to radius ; five digits to each extremity. 



Hab. Africa, including the the northern part. 



PETRODROMUsf, Peters. 



Dentition: I. ^, M.jpjj. A strongly marked sagittal ridge; 

 skull never much inflated ; no postorbital process ; large defects of 

 ossification in the palate ; pterygoid fossa extending forwards to the 

 posterior margin of palate ; suboptic foramen conspicuous ; infra- 

 orbital canal short ; angle of mandible elongated ; first upper incisor 

 very much larger than the second ; third incisor with two roots ; third 

 lower molar but little smaller than the first or second ; six or seven 

 lumbar vertebrae ; cervical spinous processes very small ; ulna an- 

 chylosed to radius ; five digits to the mauus, four to the pes. 



Hab. Eastern Africa. 



RhynchocyonJ, Peters. 



Dentition: I-g^or^, M.g^. A strongly marked sagittal 

 ridge ; skull never inflated ; cranium proper broad, flattened above 

 and very little narrowed between the orbits ; a marked postorbital 

 process ; no defects of ossification in the palate ; pterygoid fossa ex- 

 tending not nearly so far forwards as the posterior margin of the pa- 



* De Blainville, ' Osteographie : Insectivores,' p. 57, pis. iii., v., vii., viii., x. ; 

 Wagner, Schreber. Supplern. ii. p. 81, v. p. 534 ; Duvernoy, Mem. de Slrasb. i. 

 tab. i., ii., iii. p. 50 ; Jjr. Andrew Smith, ' Zool. South Africa,' pi. xv. ; Prof. 

 Peters, ' Eeise nach Mossambique,' p. 87, tab. xxii. ; Geoff. St.-Hilaire, Ann. So. 

 Nat. 1829, xviii. pp. 1G5-173. 



t Prof. Peters, ' Eeise nach Mossambique,' p. 92, tab. xxii., xxiii. ; Wagner, 

 Schreb. Supplern. v. p. 538. 



X Prof. Peters, ' Eeise nach Mossambique,' p. 100, tab. xxii., xxiii. ; Wagner, 

 Schreb. Supplern. v. p. 531. 



