Plate II. 

 Pourtalesia Jeffreys! Wyv. Thoms. 



The ambiihicrnl system coloured. 



1). The skeleton, Inid out. The phites 2 i / and 3 a 1 are necessarily foresliortened. The helcrononiy 

 of the interradials i. b 4 and 1, b^J+'2. p. 14, as also the corresponding phites A a 2, A u H, 

 4 a 4. are marked with arched, dotted lines. 



