794 



THE AMERICAN NATURALIST [Vol. XLII 



ing's fluid the region of the glands was always im- 

 mediately darkened, while the other parts were not so 

 affected. This was evidently due to a more rapid pene- 

 tration of the fluid at the point, or the staining of the 

 secretion within the pores. 



The above-described glands are also present in the 

 imago, but in this stage they are very greatly reduced in 

 size (Fig. 8) and show many signs of degeneration. The 



high cylindrical condition of the cells noted in the 

 nymphal stage is absent, and the sharply defined cell 

 divisions are not present. The protoplasm is scanty and 

 not so granular as in the nymphal stage. Many of the 

 cells show signs of breaking down. Scattered through- 

 out the glandular mass one finds many irregularly shaped 

 bodies which are stained of a pinkish color by the eosin. 

 No spaces were noticed between the individual cells. 

 The nuclei are round and oval and of about the same size 

 noted for the nymph. They show signs of breaking 

 down, in fact some of them are surrounded by clear space, 

 and many had a shrunken appearance. 



Function op the Glands of Batelli 

 Morse (1900) states that "On the sides of the seventh 

 and eighth abdominal segments may be clearly seen leaf- 

 like appendages, which are possibly branchial in nature." 

 These he figures and describes as ' ' extremely tenuous and 

 having the appearance of clusters of filaments, slightly 

 adhering together and forming lamellate appendages 

 similar to the gill-like appendages seen in the early stages 

 of Potamanthus, ' ' though he admits they do not have the 

 definiteness of these structures. Specimens he placed in 



