222 On an Extinct Fruit-Bat from the Mascarenes. 



m- 2 13j inside m-2 9'2 ; zygomatic breadth (approximate) 27 ; 

 least interorbital breadth 7*8 ; the dimensions of the struc- 

 ture behind postorbital process cannot be taken ; greatest 

 breadth of brain-case 15 ; occipital depth 11 -, mandible 40*6 ; 

 maxillary tooth-row exclusive of incisors (alveoli) 20' 1 ; 

 mandibular tooth-row exclusive of incisors (alveoli) 22";5. 



Teeth. — With the longitudinal grooving characteristic of 

 the genus Pteropus, very strongly developed, somewhat 

 large and heavy for the size of the animal ; canines long and 

 sharp, both above and below, with unusually acute and 

 prominent postero-internal basal ledges^ those of the maxillary 

 in particular ; first upper premolars very minute, but would 

 have been still persistent in the type and standing in the 

 tooth-row. 



Measurements. — The sizes of the upper incisors and second 

 upper molars are omitted, as these teeth are wanting in the 

 specimen. Vertical length of upper canine 7*5 mm. ; hori- 

 zontal length of upper canine 3*5 ; horizontal length of p- 3 

 3*8, width 2-3 ; horizontal length of P;^ 3-8, width 3 ; 

 horizontal length of m. 1 4-1, width 2-1. Lower teeth — com- 

 bined breadth of incisors — ?; height of canine (from basal 

 ledge behind) 5; horizontal length of anterior premolar 2 ; 

 of p. 3 3"8, width 2*1 ; horizontal length of^\ 3'5 ; of m. 1 4*3, 

 width 2 ; horizontal length of penultimate molar 3, width 

 1*8 ; horizontal length of m. 3 1'5, width 1*4, 



Locality. — Round Island, North-east Mauritius. 



As compared witli the now existing Fteropi of tlie 

 Mascarenes, this species occupies a ])lace intermediate between 

 Pteropus vampyrus and Pt. rodricensis, in size only, the 

 dentition being typical of Pteropus^ whereas the two above 

 species fall into the subgenus Specti'um. The only other 

 fruit-bat occurring in the Mascarenes is Pt, ruhricolUs, and 

 this has been placed b}' Matschie in his subgenus Serico- 

 tiycteris. A great analogy, in fact, exists between the dentition 

 of Pt. tnascarinus and those species of Pteropus {tonyanus, 

 Gouhh'i, and conspiciUatus) inhabiting Australia and the 

 islands of the Pacitic Ocean. 



The limb-bones call tor no special description, the mo.^t 

 perfect specimen being the right femur, which measures 

 40 mm. 



Since the above was written a few additional bones referable 

 to this new species, and representing two younger individuals, 

 have been received. Their fragmentary condition has, 

 however, failed to add any additional particulars to the above 

 description of this interesting and lost species. 



