96 



PART I. GENERAL ACCOUNT 



the cells are full of secretion. Still farther forward the lateral part of the wall 

 of the spermduct thins out again and loses its cilia, then the inner wall turns 

 inwards, becomes thicker again and glandular crypts develop on whose sides 

 little bunches of cilia may be seen (Fig. 63). Finally, the long anterior or distal 

 part of the spermduct, lying in the metameric region of the metasoma, is 

 lined with very tall ciliated cells (Fig. 64). 



w cv 



Fig. 64. Transverse section of a male Lamellisabella zachsi in the metameric region of the metasoma. 

 cpa - coelom of adhesive papilla ; cut - cuticle ; cv - corpus cardiacum ; ep - epidermis ; fil -fila- 

 ments of spermatophores ; gt - pyriform gland; mc - circular muscle fibre; mes -mesentery of 

 spermduct; ml - longitudinal muscle fibre; nd - dorsal nerve trunk; pa - papilla; pgt -pore of 

 pyriform gland; spd* - spermduct; sph - spermatophore ; vd - dorsal blood vessel; vv -ventral 

 vessel. (After Ivanov, 1958a.) 



The spermatophores are formed in the proximal parts of the spermduct. 

 The envelope of the spermatophore is undoubtedly produced by the secretory 

 activity of the gland cells of the epithelium. The fully moulded spermato- 

 phores lie in the distal part of the spermduct (Fig. 64), arranged in a single 

 row in each spermduct parallel to each other and all pointing the same way — 

 outwards and forwards (Fig. 60). Alongside each spermatophore lies its 

 attached filament. 



The lumen of the spermduct represents a ciliated canal by means of which 

 a part of the coelom communicates with the exterior. It may thus fairly be 

 accounted a coelomoduct. 



