DESCRIPTIONS OF THE PAPILLARY RIDGES 21 



patterns. The main types of arrangement, then, are radiating, 

 transverse and oblique, longitudinal, arches, loops, ellipses and 

 whorls. 



Fig. 3. — Azara's Opossum. Diddphys 

 AzarcB. Manus, right. Drawing 

 from dead specimen. A. Papillary 

 ridges on enlarged group of 

 nodules. 



Fig. 4. — Azara's Opossum. Didelpkys 

 azaras,. Pes, right. Dra%ving from 

 dead specimen. 



Descriptions of Specimens. — In each case the hand or foot is, 

 for the sake of clearness, divided into regions: (1) Digits; 

 (2) Palmar or Plantar surface and the signs D. 1; D.2; D. 3; 

 D. 4 ; D. 5 are used to indicate the separate digits, beginning 

 from the pollex and hallux, and the anterior and posterior 

 organs are spoken of as Hand and Foot, the papillary ridges as 

 P.R. 



