1872.] G-. E. Dobson — Osteology of Tricenops jpersicus. 139 



In Ph. larvata the coronoid process of the mandible exceeds the canine 

 tooth considerably hi vertical extent, and the upper margin of the condyle 

 is raised above the summits of the molar teeth. 



The dental formula corresponds with that of Phyllorhina : — 



T 2 1—1 2—2 3—3 



i^i ; c- i=r; v- m - 2 — 2 ; m. 3 — 3 . 



The upper incisors are deeply bifid, and, as in all genera of Phinolophi- 

 dce, minute, placed near each other in the centre of the space between the 

 canines at the extremities of rudimentary premaxillse suspended in the nasal 

 cartilages. The upper canine has a well developed, acutely pointed talon 

 behind, in front a raised ridge extendhig nearly half its vertical extent and 

 terminating in a small blunt projection. The first upper premolar is minute 

 with a slightly concave crown, it is placed outside the tooth-row ; the last 

 molar is considerably more developed than in Phyllorhina and resembles that 

 of Mhinolophus, equalling, in the antero-posterior diameter of its crown? 

 more than three-fourths the second premolar, while in Ph. larvata, Ph, 

 nobilis, and other species of Phyllorhina, it is less than half. 



In the lower jaw the incisors are deeply bilobed ; a faint indication 

 of a third lobe is discernible with the aid of a lens, on the outer side of the 

 outer incisor. 



The first premolar has the cingulum largely developed, expanded horizon- 

 tally on all sides, and sending upwards, anteriorly and posteriorly a small 

 process, so that the tooth appears, at first sight, tricuspidate. The posterior 

 process is much more vertically extended than the anterior one. 



The third molar equals the second in size, contrasting with the imper- 

 fectly developed last molar of Phyllorhina. 



The manubrium sterni differs remarkably from that of Ph. larvata which 

 may be taken as characteristic of the form of this bone in Phyllorhina. The 

 lateral processes behind the sterno- clavicular articulation are triangular and 

 acutely pointed, contrasting with the irregularly blunt processes of Ph. 

 larvata ; the carina is greatly developed, forming a deep, quadrilateral pro- 

 jection arising from the entire length of the bone. The second sternal bone 

 is provided with a deep triangular projection, the anterior margin of which 

 is separated from the posterior margin of the carina manubrii by a wide 

 triangular space ; behind, the projecting posterior angle conceals the junc- 

 tion of the third sternal bone. The third bone is small, narrow, and spine- 

 like ; its posterior extremity supports a thin, semicircular cartilage. 



In Phyllorhina the carina manubrii is shallow, forming a slightly raised 

 ridge for more than two-thirds its length ; in the anterior third it is pro- 

 duced into a blunt spine. The second sternal bone develops a shallow keel 

 along its entire length ; the third bone is short, expanded laterally, termina- 

 ting in a semicircular margin.* 



* This is the most usual form of the sternum in insectivorous bats. (See Blain- 

 ville, Osteographie). The number of bones here given is the number of separable 

 bones distinguishable in the sternum of an adult specimen. 



