38 



ART. 4. — EKITARO NOMURA : 



P9 P" U 



Fig. 28. 



L. loüleyi. Diagram to show the form and position of the pharyngeal glands, ps — prosto- 

 mium, m — mouth, be — buccal cavity, phr — pharynx, oes— oesophagus, int — intestine, br — 

 brain, pg — pharyngeal glands, ncm — peripharyngeal nerve commissure, nc — ventral nerve cord, 

 ss — septal sac, is — incomplete ventral septa, pn — pharyngeal nerve. 



segment V, where it lies on the ventrolateral side of the intes- 

 tine. Each gland consists of a compact mass of pear-shaped 

 cells about 20 /* long, enveloped by a thin layer of connective 

 tissue. The cytoplasm of the gland cells stains feebly but con- 

 tains numerous secretory granules, which take up Delafield's 

 hematoxylin well. A large nucleolated nucleus lies in the middle 

 of each cell. The proximal end of the gland cell is prolonged to 

 form its own duct, which either unites with others coming from 

 neighbouring cells or opens directly into the pharyngeal cavity. 

 The efferent ducts from the parts of the lateral glands lying in 

 segments IV and V, proceed anteriorly and open at the middle 

 of segment III, in the same transverse line with the other rows. 



The oesophagus is narrow and is confined to segment IV ; its 

 inner cavity is flattened dorso-ventrally. The ciliated endodermal 

 cells contain each a nucleus at the middle. A few chloragogue 

 cells are always present on the dorsal side of the oesophagus. 



The intestine commences in segment V and terminates with 

 the anus, which is dorsal in position. The inner epithelium is 

 ciliated ; the vascular layer which comes next is well developed 

 and is surrounded by feebly developed muscle fibres. The chlo- 

 ragogue layer is very well developed in the anterior portion of 

 the body, especially in segments V-VIII. Each chloragogue cell 



