Hunter, Nervous System of Molgida. 



203 



pearing at once under a fairly high magnification. They do 

 not appear to be grouped in a regular manner, although they 

 seem to be quite evenly distributed the length of the endostyle. 

 They stop abruptly at the anterior end of the endostyle, not 

 being found in the peri-pharyngeal bands ; nor are they found 

 in the anterior portion of the digestive tract proper. 



The bipolar sensory cell as stained with methylene blue is 

 characterized by a distal knob or spike-like enlargement, one or 

 more enlargements situated more proximally, one of which con- 

 tains the nucleus, and a more or less conspicuous enlargement at 

 the point where the nerve fibril leaves the basement membrane. 

 This cell, however, assumes many other forms — presumably 

 modifications — as may be seen by glance at figure i. The nu- 



Fig. I. Sensory and gland cells in the endostyle. Showing modification of 

 the bipolar type of sensory cell. Camera drawing from several different speci- 

 mens. I 12 imm. Oc. 6 (Zeiss). 



clear enlargement may be situated very near the distal end of 

 the cell or it may, on the other hand, have a basal position and 

 lie close to the basement membrane. In one or two cases the 

 nuclear enlargement appeared to show fine protoplasmic 

 branchings. 



The proximal continuations of the cells after leaving the 

 basement membrane turn sharply at right angles and run as 

 many single loose fibrils up the endostyle. No very definite 



