436 



NAOHIDE YATSU 



supraoesophageal ganglion. Their diameters vary naturally 

 according to their secretory activity. The gland cells usually 

 assume a club shape, tapering towards the openings. In this 

 form as in other marine ostracods, the gland cells are not differ- 

 entiated into the gland proper and the duct, contrary to those of 

 fresh water forms (Bergold, '10). The secretion granules fill 



Fig. 1 Upper lip of C. hilgendorfii seen in an oblique view from the anterior 

 side. One of the middle pair of protuberances is behind the anterior one. X 

 115. 



Fig. 2 Upper lip of C. hilgendorfii f 9 ) seen from the right side. Fresh, 

 material treated with methylgreen acidulated with acetic acid. Mucous gland 

 cells are stippled. X 90. 



up a greater part of the cells, if specimens are killed quickly, 

 that is, before the oozing out of the contents. But in indi- 

 viduals from which the secretion products have been discharged, 

 the lower portion of the cells has a large space containing a 

 coarse spongy coagulum. This space, especially in poorly fixed 

 preparations, is liable to give a deceptive picture, as though 

 there were a large reservoir common to all the gland cells. 



