1S72.] G. E. Dobson — Osteology of Tricenops persicus. 1-11 



length ; foramen rotundum united with sphenoidal fissure ; roof of meso- 

 pterygoid fossa with a longitudinal groove terminating in an excavation pos- 

 teriorly ; basi-occipital between auditory bullae very narrow, in most species 

 linear ; par-occipital processes slender, produced ; antero-posterior diameter 

 of last molar equal to more than three-fourths that of antepenultimate molar ; 

 premolars tzs- 



Slllfam. II PHTLLOEHTNESTiE. 



Toes equal, with two joints eacb ; ileo-pectineal spine united by bone 

 with a process derived from anteroinferior surface of ilium. 



Genus. 2. Phyllorhma. 



Metacarpal bone of fourth finger less than that of second finger in 

 length ; foramen rotundum distinct ; auditory bullae separated by a broad 

 basi-occipital ; roof of mesopterygoid fossa continuous with under surface of 

 the basis cranii, not grooved, nor perforated by foramina ; par-occipital pro- 

 cesses short, blunt ; zygomata narrow, slightly expanded posteriorly, curved 

 outwards ; antero-posterior diameter of last molar less than half of the 

 antepenultimate molar ; premolars — , or — i. 



Genus. 3. Tricenops. 



Metacarpal bone of fourth finger less than that of second finger in 

 length ; foramen rotundum united with sphenoidal fissnre ; basi-occipital be- 

 tween auditory bullse narrow, not linear ; roof of mesopterygoid fossa pierced 

 by foramina, not grooved, continuous posteriorly with under surface of basis 

 cranii ; par-occipital processes long, slender ; zygomata greatly expanded ver- 

 tically, not curved outwards ; last upper molar equal to three fourths of the 

 antepenultimate molar ; mandible pierced by an infra-condyloid foramen ; pre- 

 molars - — . 



2—2 



Genus. 4. Coslops.^ 



Metacarpal bone of index^finger very long, 'extending beyond the first 

 phalanx of the second finger ; metacarpal bone of fourth finger exceeding 

 that of second finger in length ; basi-occipital broad between auditory bullse ; 

 zygomata slender, curved outwards ; last upper molar equal to three-fourths 



2 2 



of the antepenultimate molar ; tail very short or absent ; premolars — . 



Explanation of plate vi. 



Pigs. 1-9. Tricenops persicus, Dobson. 1. Side view of skull ; la, base of skull ; 



lb, lower jaw ; alfenlarged^ double the natural size ; 2, scapula, double size ; 3, side 



view of thorax, showing the very prominent carina sterni, enlarged double natural 



size ; 4, 4a, distal extremity of humerus, enlarged four times the natural size ; 5, third 



* Type Ccelops Fritliii, Blyth, Journ. As. Soc. Bengal. Dr. W. Peters has noted the 

 relations of this genus with Phyllorhina. (See Monatsber. Berlin Akad., 1SG5, p. 614, 

 and also for 1871). 

 19 



