A specimen of the 

 Spitzbergen variety of 

 Apus glacialis ( X lo), to 

 show the general _ ar- 

 rangement of the limbs 

 and their gradual dimi- 

 nution from front to 

 back. The white masses 

 on each side near the 

 brood pouches are par- 

 tially extruded eggs, 



