i6 



coecum running proximally in the mouth-cavity (b), present in nearly all specimens. Besides 

 there occur folds (c), ventrally suspended from the dorsal wall. This wall is very minutely folded 

 and provided with a strong cuticle ; the ventral wall behind the mouth is ciliated. 



The transition into the pharyn.x is gradual. The latter is round, with strongly folded 

 wall and encircled by vigorous circular muscles (m). On the dorsal side the wall is built up 

 of cylindrical epithelium with delicate cuticle. The pharynx unites with the proximal coecum ; the 

 part originating from this coalescence is a wide tube, the whole of which is coated by strongly 

 cuticulated epithelium ; the wall is minutely folded, which folds grow larger on the ventral side. 

 A litde coecum (d), directed distally, is present. 



Both widely separated salivary glands take their origin in the ventral wall. They show 

 the following peculiarity : there are two tubes (e) proceeding distally, the wall of which is strongly 

 folded and constituted of rather cubical epithelium. Against the wall an obviously staining mass 

 is situated, which may reach such an extent, as to fill the folds. I look upon this mass as a 

 secretion from the tubes (fig. 64 c). When looking at figs. 63 and 64 we observe that these 

 tubes pass into narrower ones (s g), formed like the salivary glands of other Neomeniidae ; 

 they take their course ventrally from the intestine. These are the salivary glands, which therefore 

 do not open out directly into the pharynx, but through the above-mentioned wide tubes e. In 

 none of the Solenogastres known until now has this been observed, nor has it been mentioned 

 of Proneomenia australis (Thiele 9). 



Behind the salivary glands the radula is found. The pharynx has already attained here 

 a tolerable width and has the character of the intesdne. An oesophagus cannot be distinguished 

 here. The radula is more or less curved and ends in the radula-sac r. The radula is well 

 developed and of a distinct distichous character (figs. 65 — 69). Its structure cannot be thoroughly 

 examined. Any perfect similarity between the difterent specimens does not exist. Fig. 65 

 represents the teeth of the largest specimen. ^ is a tooth from the radula itself, B a fullgrown 

 tooth from the radula-sac ; for the rest there are fragments of teeth, which of course occur in 

 various other shapes. In another specimen the .same shape is met with as represented in fig. 65 

 together with pointed curved fragments (fig. 66). Fig. 67 however shows more comb-shaped teeth. 



All these shapes may be reduced to one type, viz. that of fig. 65 A. These teeth are 

 arranged in two rows (fig. 68) upon a very strong basal membrane (b). In the radula-sac the 

 formation of the teeth is seen simultaneously with that of the pedicles c by which the teeth 

 are supported. The distichous character of the radula is clearly visible from the radula-sac ; it 

 is noticed that the teeth are formed in two separate sets in connection with each other and 

 lined with one continuous epithelial layer, yet remaining separated. Moreover fig. 69 represents 

 the radula at the point, where it bends into the radula-sac : there are two rows of teeth severally 

 separated by an epithelium fold, folded in such a manner with respect to the teeth, as to make 

 the latter exactly fit into it. The radula-sac is alternately directed proximally or distally, there 

 being a])parently some relation between its direction and the state of contraction of the intestine. 



In one specimen, the one of the length-index 9, a radula cannot pos.sibly be demonstrated, 

 but the structure of the digestive canal corresponds to that of the other specimens. 



The intestine takes a normal course; the septa are very regular and alternate with strong 



