450 THE ANATOMY OF VEETEBEATED ANIMALS. 



the posterior inguiual. The other three pair are equidistant, 

 aucl lie along the ventral surface, internal to the edge of the 

 orbicularis pannicvll. 



Like the Rodentia, the Insedivora have a great diversity 

 of habit; some Galeopitheci flitting through the air after 

 the fashion of the flying SquiiTels ; some arboreal, as the 

 TupaycB ; some terrestrial and cursorial, like the majority 

 of the order. A few are swimmers; and some, like the 

 Mole, are the most completely f ossorial of mammals. 



The most abeiTant form of the Lisectivora is the genus 

 Galeopitliecus, essentially an Insectivore of arboreal and 

 frugivorous habit, with veiy long and slender limbs. These 

 are connected with one another, with the sides of the neck 

 and body, and with the tail, by a great fold of the integu- 

 ment, n'hich is called pataginm ; and, unlike the web of the 

 Bat's wing, is hairy on both sides, and extends between the 

 digits of the pes. By the help of this great parachute- 

 like expansion, the Galeopitliecus is ensbled to make float- 

 ing leaps, from tree to tree, thi'ough great distances. When 

 at rest, the Galeopitheci suspend themselves by their fore 

 and hind feet, the body and the head hanging downwards ; 

 a position which is sometimes assumed by the Marmosets 

 among the Primates. 



The fore limbs are slightly larger than the hind limbs. 

 There are four axillary teats. The male has a pendent 

 penis and inguinal scrotal pouches. The pollex and the 

 hallux are short, and capable of considerable movement in 

 adduction and abduction, but they are not opposable ; and 

 theiv claws are like those of the other digits. 



The occipital foramen is in the posterior face of the 

 skull. The oi'bit is nearly, but not quite, encircled by 

 bone. The lachrymal foramen is in the orbit. The bony roof 

 of the palate is wide and its posterior margin is thickened. 

 There is a strong cuiwed post-gienoidai process of the 

 squamosal, which unites with the mastoid, beneath the 

 auditory meatus, and restricts the movement of the man- 

 dible to the vertical plane. A longitudinal section of the 

 skull shows a large olfactory chamber projecting beyond 



