XIX.] 



PRIMATES. 



345 



The structure of the foot of the Lemurma resembles 

 generally that of the Simiina, and is in fact one of the 

 principal bonds of union between these groups. The hallux 

 is large and opposable, with a flattened ungual phalanx. 



The second digit in Lemur has a narrow, pointed, ungual 

 phalanx, while that of the other digits is flat and spatulate 

 as in the Simiina. In Chiromys all the ungual phalanges, 



a 



ct> 



Fi<;. 123. Right pes of Tarsius spectrum (nat. size), a astragalus ; c calcaneum , 

 n navicular ; cl internal cuneiform ; c 2 middle cuneiform ; & external cuneiform ; 

 cb cuboid ; I to V the digits. 



except that of the hallux, are compressed, curved, and 

 pointed. 



In Perodicticus there is a supplemental ossicle in the 

 transverse ligament of the plantar surface of the tarsus, 

 corresponding to that met with in the carpus (see p. 286). 



A remarkable elongation of the tarsal segment of the pes 



