EXTERNAL CHAEACTEHS OF A FOETAL CHIROMYS. 



1167 



The ear is covered with short hair externally, and is flat and 

 not hollowed, but the ridges and depressions characteristic of 

 the adult are all indicated. In the adult the ear is naked 

 internally and deeply hollowed ; it is also relatively much larger 

 than in the fcetus, its length being equal to the distance between 

 its intertragal notch and the end of the rliinarium, whereas in 

 the young its length is only equal to the distance from the end 

 of the rliinarium to a point just behind the eye. 



The toiigue differs in at least two particulars from that of the 

 adult. The distal margin of the sublingua is irregularly pointed 

 and serrulated, and the median inferior ridge ends in a soft 

 straight point, not in a hard down-curved hook. In the points 



Text-fio-ure 5. 



t i 



Hand and foot of fcetal CMromys. 



in which the sublingua differs from that of the adult, it 

 approaches the less specialised condition seen in the typical 

 Lemurs. 



The fore limbs closely resemble those of the adult, but the 

 are relatively much shorter. The fourth digit, for 

 example, is only a little longer than the palm, whereas in the 

 adult it is nearly twice the length. The pollex also is relatively 

 much nearer to the second digit than it is in the adult. 



The hind limb closely resembles that of the adult in all im- 

 portant respects. It is, however, relatively shorter in all its parts. 



digits 



