JOURNAL OF ENTOMOLOGY AND ZOOLOGY 93 



the cells and following the irregular folds and wrinkles presented 

 by these, there is the chitinous intima (Fig. 3). On the other side 

 of the cell layer, there is the basement membrane, which is likewise 

 a continuation of the basement membrane of the hypodermis. The 

 basement membrane is continuous over the surface of the glandular 

 cells. The epithelial cells of the reservoir appear to be syncytial, 

 as mentioned by Claus, but I believe that this is due to the fact that 

 they are so small and attenuated at their base. I believe that with 

 proper fixers and stains the distinctness of the cells may be proven. 

 Indeed, in the sections which I have examined, there are indications 

 that this is the case. The shape of the epithelial cells of the reser- 

 voir is another illustration of the adaptability of the body tissues 

 to meet their special demands. One would certainly expect such a 

 shape of cells in a layer which is subject to frequent folding and 

 unfolding, as is the epithelium of the reservoir. 



The structure of the glandular cells is somewhat more compli- 

 cated. Usually they are round, but owing to the blood pressure, 

 they often assume an oval and even a polyhedral form. Three 

 such glands are seen in Figs. 9-11. Figs. 9 and 10 are of two 

 glands of the same larva, which has been fixed in Gilson's Fluid 

 and stained with haematoxylin and eosin, while Fig. 11 is from a 

 larva fixed in Flemming's solution and stained with iron haematox- 

 ylin. In the center of the gland there is a very large, deeply stain- 

 ing nucleus (N). Usually this is round, but it may often be oval. 

 It is very coarsely granulated throughout, with still larger granules 

 scattered here and there. Figs. 9-10 show no vacuoles at all m 

 the nucleus, while in Fig. 1 1 the nucleus has small vacuoles. The 

 cytoplasm has a very granulated ground substance in which are 

 imbedded large, red, shining granules (Figs. 9-10, Gr.), which are 

 probably part of the oily secretion. In Figs. 9-10 the cytoplasm is 

 much vacuolated, the vacuoles being bridged over by many irregular 

 strands which connect the various processes of the cytoplasm. In 

 Fig. 11, the cytoplasm is not vacuolated except for a small vacuole 

 half way between the apex of the nucleus and the top of the cell. 

 In this vacuole ends the chitinous little canal (CI) through which 

 the secretion reaches the reservoir. This chitinous canal is a con- 



