jr ori the ISIatural Group of TuniCaia.. 551 



the granulated liver, of which the curved commencement 

 is seen opposite to a small mass of the left ovary, which, 

 in cutting the envelope, has been left adhering to the 

 mantle just under the anal orifice. The rest of the left 

 ,21' ovary may be seen behind the ascending stomach, adher- 

 ing to a fragment of the mantle, of which the muscular 

 transverse fibres are very visible. Some of these fibres 

 are also seen traversing the intestine and right ovary, 

 keeping these parts as it were in situ. Between the in- 

 testine and the branchial orifice (which is marked on the 

 inside by a circle of plumose tentacula) may be distin- 

 guished the folds of the reticulated branchial pouch. The 

 anal orifice is internally somewhat elevated and qua- 

 drifid. 



Fig. 3. Boltenia re7iiformis magnified, and the parts seen as in 

 the former figure, except that the right ovary is separated 

 from the intestine, and put aside with the stomach, so as 

 to show the beautifully granulated lobes of the liver, 

 which appear to be most voluminous towards the pylorus. 

 The singular cubical lobes of the right ovary become also 

 visible in this view of the several parts. 



Fig. 4. Outline of Boltenia reniformis magnified as before. The 

 intestine and right ovary being removed from their place, 

 in order to show the position of the other parts more 

 distinctly. 



A. Anal orifice. 



B. Branchial pouch. 



C. Branchial orifice. 



T. Circle of tentacular filaments, which surround 

 in a pulpy irregular form the inner part of 

 the branchial orifice. 



D. Dorsal sulcus. 



E. Frag- 



