BY VERA A. IRWIN-SMITH. 



91 



pharynx by fine ducts (Fig. 83, d.cf.). Strands of tissue connect 

 the bulb with the inner wall of the rostrum, both at the anterior 

 end and further back (Fig.32, t:.). The muscle-fibres in the pos- 

 terior bulb are all radial, and are divided into three sections by 

 two radial gaps, which are very constant in position in different 



Figs..31-33.— (7/t. haswelH. 



Series of tr. sees, through the head; ( x 950). The head has been distorted 

 in shape during the process of embedding. 



Fig.31. — Section through the rostrum. 



Fig. 32. — Section through the 'banded' area. 



Fig. 33. — Section through the hinder part of the anterior pharj^ngeal bulb; 

 .v., sensory cells; d.(/., digestive glands; p., pores in the striiii of 

 the banded area; c, fibres from pharynx to body-wall. 



specimens. This gives the appearance of a broad band surround- 

 ing the middle region of the bulb. The gaps contain a granular 

 substance, wliich is probably glandular in character. The ter- 

 minal portion of the pharynx consists of a knob (Fig. 30, X;.), 



