. An introduction to the study of mammals living and extinct. Mammals. CHIROPTERA 647. the Ilhiiiolojihida', the only family of insectivorous Bats wanting the tragus, the auditory bullae reach their greatest size, and the highly sensitive nasal appendages their highest development; and that in'the typical group of the Molossince. the ear- conch is divided by a prominent keel ; and the antitragus is unusually large in those species in which the tragus is minute (see Fig. :298, a). In the frugi- vorous Bats the form of the ear-conch is very simple, and but slightly variable throughout the -^-ari
. An introduction to the study of mammals living and extinct. Mammals. CHIROPTERA 647. the Ilhiiiolojihida', the only family of insectivorous Bats wanting the tragus, the auditory bullae reach their greatest size, and the highly sensitive nasal appendages their highest development; and that in'the typical group of the Molossince. the ear- conch is divided by a prominent keel ; and the antitragus is unusually large in those species in which the tragus is minute (see Fig. :298, a). In the frugi- vorous Bats the form of the ear-conch is very simple, and but slightly variable throughout the -^-arious types. In all Bats the ears are extremely mobile, each moving independently at the will of the animal. This has been observed even in the frugivorous Ptem- podidce, in which the peculiar vibratorv movements farst noticed m Artihcns (FromDoteon,p™!. isro.) 0, pcrapiciUatuH may also be seen when Antitragus; 6, keel of the eai--conch; r, the animals are alarmed. "°"='> '''''™^ The opening of the mouth is anterior in most species, but in many it is inferior, the extremity- of the nose being more or less produced beyond the lower lip,—so much so indeed in the small South-American species Jihi/nchoni/cteris itaso as to resemble that of the Shrews. The lips exhibit the greatest variety in form, Avhich will be referred to under each family. The absence of a fringe of hairs is characteristic of all fruit-eating Bats, and probably always distinguishes them from the insectivorous species, which thej- may resemble in the form of their teeth and other respects. The oesophagus is narrow in all species, and especially so in the sanguivorous Desmodont Phi/llostoiiiatithr. The stomach presents two principal types of structure, which correspond respectively to the two great divisions of the order, the Megachiroptera and the Micro- chiroptera; in the former (^\'ith the exception of Harju/ia) the pyloric extromit}- is more or less elongated and folded
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Keywords: ., bookauthorly, bookcentury1800, bookdecade1890, booksubjectmammals
