(76) 



FIGURE 114. Building of the case of Molanna angustata: 

 spinning glands (A), diagram of the case of Molanna, transverse 

 and longitudinal sections (B), supporting base, temporary case and 

 first part of the construction of the tube of the definite case (C), 

 zigzag suture connecting the sand particles (D), a piece of felt of 

 the inner surface of the tube (E), completed tube and the beginning 

 of the construction of the anterior hood (F) (A - after Zarechnaya, 

 B— F — after Dembovskii) 



The larva then begins to build the tube, making a narrow ring of sand 

 grains around its body which forms the anterior margin, and gradually 

 builds the tube on this ring. During the building, the larva projects from 

 the anterior opening of the case; it takes a particle, turns it in various 

 directions, but does not smear it with secretion; it only examines the 

 particle. If it is unsuitable, it is discarded. The larva may sometimes 



69 



