286 



ZOOLOGY 



SECT. 



separated by a slight constriction from the depressed head, and 

 passes insensibly into the compressed tail, which is bordered by a 

 continuous median fin unsupported by fin-rays. The limbs are 



3 ! 



small and weak in proportion to the size of the body, and in the 

 ordinary swimming attitude are directed backwards, more or 

 less parallel to the sagittal plane, the upper arm and thigh taking 

 a direction backwards and slightly upwards, the fore-arm and 



