44 Charles GELDERD 



We hâve not been able to distinguish the striations in thèse muscles. 



Frey ('), who had seen the tvvo kinds had not observed any striations. 



Surrounding the muscular layer, is the serous membrane, the propria 

 of Leydig, Ly, fig. 21. 



The epithelium of the intestine forms a diverticulum at the posterior 

 part of the pyloric cavity, the dorsal diverticulum, fig. 32. 



The epithelial cells of the diverticulum are columnar. 



They are very much longer and more voluminous than the epithelial 

 cells of the intestine. 



Their nucleus is situated at the base of the cell. 



The protoplasm of the cells is composed of filaments and is slightly 

 granular. 



The cells possess a striated plateau. 



At the terminal région of the intestine the epithelial cells become 

 elongated, fig. 22, 23. 



They are without a chitinous cuticle in this région. 



We hâve already observed that there is a change of epithelium at the 

 extremity of the intestine which is developed into valvular folds, fig. 24. 



It is composed of a loose tissue and ressembles what is described in 

 the insects as y fatty tissue ". 



In Nyctiphanes this tissue is found to excrète small fat-like globules. 



Salivary glands. 



Thèse glands are composed of a large number of small spherical bodies. 



If the section passes through the centre of one of thèse bodies, they 

 are found to be formed of several conic cells with a segment of a sphère 

 for base, fig. 5, 44. 



The summits almost meet in the centre of the sphère leaving only a 

 very small space. 



At the summits of each cell small lines are seen coloured black with 

 the hsematoxylin of Heidenhain, which gives a radiated aspect at the 

 centre of the sphère. 



The protoplasm of the cells is granular and contains a large number 

 of small vacuoles. 



The nuclei of the cells are granular and is situated at the base. 



(') Frey : Loco citato. 



