. Catalogue of the Chiroptera in the collection of the ... Museum. 64 PTEROPTTS. iu one or other direction (either by eiilnrgemeiit of the posterior basal ledges of tlie molariform teeth, or development of an inner basal ledge in the lower cheek-teeth, or tendcnc}- to splitting of inner ridges of certain lower cheek-teeth, or reduction of m^ and m^, or excessive development of cingulum of canines and incisors, or by several of these modifications combined). Compare skull and numdible of I'leralojx'.v. I -A, typical Plei-oijine skull (Pt. hyjjomdnhilh tomci^i, ); see text p. Gl.
. Catalogue of the Chiroptera in the collection of the ... Museum. 64 PTEROPTTS. iu one or other direction (either by eiilnrgemeiit of the posterior basal ledges of tlie molariform teeth, or development of an inner basal ledge in the lower cheek-teeth, or tendcnc}- to splitting of inner ridges of certain lower cheek-teeth, or reduction of m^ and m^, or excessive development of cingulum of canines and incisors, or by several of these modifications combined). Compare skull and numdible of I'leralojx'.v. I -A, typical Plei-oijine skull (Pt. hyjjomdnhilh tomci^i, ); see text p. Gl. B, skull of a species with short rostrum and heavy dentition (Pt. cnieliam(f, ;"6) ; text p. 63. C, skull as modified in species with excessively weak cheek-teeth (Pt. icapulatus,&lX>); text p. (iS. All figures \. The three principal types of Pteropine skulls described above as (2), (;i), and (4) must not be considered sharply separated. There is, on the contrary, a perfectly gradual transition from (2) to (3) (viz. by species showing various stages of reduction in the sizes of the teeth, and therefore also more or less pronounced leanings towards the cranial charactei's of weak-toothed species), and several transitional stages betAveen (2) and (4) (some of the most instructive examples are found in the I't. iiselajiliut group ; certain jieripheral. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Department of Zoology . [Mammals]; Dobson, George Edward; Andersen, Knud. London
Size: 1325px × 1886px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade191, bookpublisherlondon, bookyear1912
