178 



«. Retral processes, occupying, .when in situ, the grooves, and especially their 



terminating tubes. 

 b. Connecting necks, joining together the contiguous segments, and, when in 



situ, occupying the oral (P) apertures (fig. 5, b). 

 e. Primordial globular cell. 

 d. Young and partly spherical cells, connected together as in a matured Ro- 



talina or Nonionina, by single necks. 

 Fig. 7. Oblique postero-lateral view of two segments (magnified 160 diameters) of 



the soft animal. 



a. Anterior convex surface of the segment 



b. Posterior concave surface of the segment. 



c. Lateral retral processes, corresponding to fig. 6, a. 



d. Connecting necks, arising from the inner margin of each segment and 



attaching adjoining ones together. 



