. Catalogue of the Chiroptera in the collection of the ... Museum. . A P. Fig. 26.— Palate-ridges. A, Pi^rojnis hypuineUnius ionieni (), for eomparisun ivitb B, Dubaimia exoleta (). The "probable houiologiea of the ridges is indicated by the lettering of the figures. Both figures {. specific and individual variation.—The homologies of the ridges, as compared with those of typical species of Pterojms, will he readily * Milk dentition and honwlogies of incisors.—The peculiar modifications vf the upper and lower incisors and canines so conspicuous in the permanent set of te
. Catalogue of the Chiroptera in the collection of the ... Museum. . A P. Fig. 26.— Palate-ridges. A, Pi^rojnis hypuineUnius ionieni (), for eomparisun ivitb B, Dubaimia exoleta (). The "probable houiologiea of the ridges is indicated by the lettering of the figures. Both figures {. specific and individual variation.—The homologies of the ridges, as compared with those of typical species of Pterojms, will he readily * Milk dentition and honwlogies of incisors.—The peculiar modifications vf the upper and lower incisors and canines so conspicuous in the permanent set of teeth of Dobsonia have not reacted in the slightest degree on the milk dentition. A young B. prcedatrix in the collection (, forearm about 62 mm., as against 111-121 in adults of same species) has tbe following milk teeth (added, in upper aud lower row, the permanent set for comparison): i'^ c p' p* m^ m- ^ ^' -£—^ • Four upper milk incisors spiculiform, slightlv diidi„dc dpjdpi *' '^ - s j '2 c Pi Pa P4mjmjm3 recurved, very distinctly spaced (interspaces a little less than 1 mm.), perfectly alike in shape and size. Permanent i'' visible above and estei-nal to di- (jaw cut open), but no trace of a permanent incisor belonging to di^ This appears to be conclusive evidence that the missing pair of upper incisors in the permanent »€v is i\ not i- (compare Boneia, antea, p. 68, in which tbe missing upper inciso? is also i^; in the Rousettine branch of Megachiroptera Boneia and ZJoftsoJiJO. are the only genera with 1—1 upper incisors ; in certain specialized genera of the Cynopterine branch it is i^ that is reduced). Middle lower milk incisors (dii) extremely small, barely cutting gum, spiculiform, not recurved, in .perfect contact with each otiier ; outer lower milk incisors (dij) separated from di] (interspace nearly 1 mm.), considerably higher and broader, crown slightly differentiated from shaft. The single permanent lower incisor is. Please note that the
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Keywords: ., bookcentury1900, bookdecade191, bookpublisherlondon, bookyear1912
