MAXILLARY GLAND — CYPRIDINA HILGENDORFII 



437 



The maxillary gland is composed of two entirely different ele- 

 ments, namely the mucous gland cells and the yellow gland cells. 

 The posterior protuberances have the openings of the former 

 alone, while both the anterior and middle ones have those of two 

 kinds of cells (fig. 2). The secretion product of the mucous 

 cells of the maxillary gland stains intensely green with methyl- 

 green, as in the gland cells found in the appendages and the 



gm -iMM 



Fig. 3 A portion of a vertical section through the maxillary gland of C. 

 hilgendorfii (6). Alcohol-acetic preparation. X 247. 



Fig. 4 Cross section through the anterior process of the upper lip (9). 

 Flemming's fluid preparation. X 247. 



mantles. In sections the cytoplasm of the mucous cells is finely 

 granular. The other kind of gland cells I shall call the yellow 

 gland cells, since they are yellow in life, due to the color of the 

 secretion product they contain. The yellow substance, which 

 emits light, is in the form of coarse, somewhat angular, granules. 

 The size of the granules varies considerably, often attaining the 

 diameter of 10 to 15 m- In general it may be said, that the 

 nearer the openings, the larger the granules. Their seat of 

 formation is in all probability near the nucleus, inferring from 

 the fact that a small number of minute granules of the same 



