MAXILLARY GLAND CYPRIDINA HILGENDORFII 439 



One other point, which I would like to call attention, is the 

 absence of common reservoir for gland cells. Although all the 

 students of ostracods maintain that the maxillary glands are 

 unicellular, yet curiously enough those who have studied the 

 luminous glands entertain an erroneous idea that there is a special 

 cavity to store up the secretion product. Miiller ('90, p. 248), 

 for instance, states that "die Ausfiihrunsgange sammtliche 

 Driisenzellen vereinigen sich zu einem gemeinsamen Hohlraum." 

 Doflein published a paper on the maxillary glands of a Japa- 

 nese species of ostracod, which he provisionally calls Halocypris 

 (?) and gives a semidiagrammatic figure ('06, p. 134). Since 

 pigment cells are drawn in his figure, his material may have 

 possibly been Pyrocypris japonica. At any rate he inter- 

 preted the section as though there were a spacious reservoir 

 for secretion granules. Probably influenced by Doflein's de- 

 scription, Liiders ('09) a' so mentions the presence of a special 

 reservoir in Gigantocypris agassizi. It should be mentioned 

 that the above authors seem to have studied specimens from 

 which a greater part of the secretion products had been dis- 

 charged, and it is, I think, quite natural that they have come to 

 such an interpretation. The lower part of each gland cell 

 functions as a temporary reservoir of the secretion granules it is 

 true, but this cannot be called a special organ at all. As a 

 matter of fact, as I have expressly mentioned above, there is no 

 reservoir in the sense of previous writers. 



January 9, 1917 



