122 



THE COCKROACH : 



Between the cells a reticulum is often to be seen, especially 

 where the cells have burst ; it extends between and among all 

 the elements of the mucous lining, and probably serves, like 

 the very similar structure met with in Mammalian intestines,* 

 to absorb and conduct some of the products of digestion. 



Fig. 66. Epithelium of Chylific Stomach. In the upper figure the digestive surface 

 is indented, while in the lower figure it is flat. Both arrangements are 

 common, and may be seen in a single section. The epithelial buds are shown 

 below, and again below these the annular and longitudinal muscles. X 220. 



Different epithelial cells may be found in all the stages 

 noticed by Watney viz., (1) with divided nuclei; (2) small, 

 newly produced cells at the base of the epithelium ; (3) short 

 and broad cells, overtopped by the older cells around ; (4) dome- 

 shaped masses of young cells, forming " epithelial buds";f 

 (5) full-grown cells, ranging with those on either side, so as to 

 form an unbroken and uniform series. The regeneration of the 



* See Watney, Phil. Trans., 1877, Pt. II. The "epithelial buds" described and 

 figured in this memoir are also closely paralleled in the chylific stomach of the 

 Cockroach. 



+ These epithelial buds have been described as glands, and we only saw their 

 significance after comparing them with Dr. Watney's account. 



