A new Species of Nectonemertes. 345 



nemertean type as represented by Büegee (1895) in tab. 28, fig-, 1. 

 The mouth is separate from the proboscis and like the oesophagus 

 is relativly large but the arrangement of the stomach, pylorus 

 and intestine, with its anterior coecum and lateral pouches, is 

 characteristic. 



The mouth opening, as usual with the hoplonemerteans, is sub- 

 terminal and ventral (Fig. 3) but is peculiar in being- of relativly 

 large size and separated from the proboscis pore. The buccal cavity 

 is likewise of large calibre but the extensive and more or less 

 temporary folds in the surrounding walls obliterate this space to a 

 considerable degree in preserved material. 



Although the diameter of the buccal cavity is relativly large 

 its length is short and its union with the oesophagus rather abrupt. 

 This last named section of the gut is also of very limited extent, 

 being but 0,05 mm in length and therefore scarcely longer than the 

 width of the commissures which almost conceal it when viewed fronî 

 the dorsal side. Its walls are developed into numerous papillae which 

 are of a permanent character and are supported by muscle and 

 connective tissue fibres. 



The majority of the cells of the oesophageal epithelium are 

 cubical or low columnar and consist of a spongy granular protoplasm 

 with a spherical centrally placed nucleus. Among these are a few 

 gland cells whose secretion appears almost homogeneous and is 

 scarcely affected by Delafield's haematoxylin. In no case are 

 there traces of cilia although these are abundant and well preserved 

 in the succeeding section of the digestive tract. 



Immediately behind the brain the stomach appears, characterized 

 by the presence of numerous gland cells and a greater lateral dia- 

 meter than the adjacent regions of the gut. Sections show that a 

 fold of the inner wall projects forward a short distance into the 

 oesophagus thus forming a valve such as has been described for 

 Zygeupolia and some other species. In one specimen the dorsoventral 

 diameter of the stomach is not over one half that of the lateral; 

 in another the canal is nearly circular. As usual the inner lining is 

 developed into folds of great complexity. 



Two types of cells compose the gastric epithelium. The first 

 and most abundant is nearly cubical in shape and consists of proto- 

 plasm which in some cases is comparativly dense but usually of a 

 watery consistency, appearing vacuolated in sections. Each bears 

 a dense coat of cilia and contains a spherical nucleus rich in 



