THE ANATOMY OP ONCHOLATMUS VULGARIS, BAST. 115 



In sections stained with nigrosin and in some stained with 

 eosin a few fibrillte can be detected. They are^ however, 

 much finer than those of the oesophageal region, and strongly 

 resemble fibrin filaments. 



Nuclei (ibid., mn.) occur in this matrix identical with the 

 nuclei in the oesophageal region — '00215 to •00322 mm. in 

 diameter. Around them is sometimes a thin film of proto- 

 plasm which stains more distinctly than the matrix, but 

 which has not a sharp line of demarcation from it. It can 

 be demonstrated that these nuclei have no connection with 

 either epidermal or muscular cells, with gut or gonads, or 

 with either of the types of cell which will be described later 

 which lie in the body-space. They are often to be found 

 lying completely isolated and free in the matrix. 



At the commencement of the intestine the oesophageal 

 fibrillar network does not end abruptly, but the fibrillte 

 become gi-adually more and more scanty. 



In this situation, and near the termination of the intestine, 

 muscular fibres traverse the space, running almost longitu- 

 dinally. They are passing very obliquely from the body-wall 

 to the gut. 



The interval betAveen the narrow rectum and the body-wall 

 is considerable, but here the connective tissue is largely 

 replaced by muscular fibres and by the ingrowth of epidermal 

 cells to form the anal ganglion. There is, however, a basis 

 of fine fibrils. 



In the post-anal region also the epidermal cells project 

 inward to such an extent that it is difficult to say how much 

 of the fine tissue surrounding the duct of the tail glands is 

 epidermal and how much, if any, is mesodermal. 



Two types of cell occur imbedded in this substance : 



(1) The coarsely granular acidophil cell (PL 7, fig. 3), 

 oval in outline, maximum diameter '01076 mm. with a dis- 

 tinct cellular membrane. The protoplasm does not stain, but 

 contains numerous large spherical acidophil granules. The 

 nucleus is central, and stains rather diifusely, although it 

 shows some granulation (chromatin). These cells occur most 



