18 DR. HJALMAR BROCH [1918 



tinuous sheath, and not displaying a series of parallel rings or belts 

 as rn the oesophagus. — The pnoctodæal muscle fibres, like all 

 muscle fibres of Scalpellum, are distinctly transversally striped. 



In the foremost part of the digestive intestine one pair of 

 digestive glands apens into the alimentary canal through 

 two short and narrow ducts, one on each side of the intestine. The 

 gland (textfig. III, i. g.) is almost ball-shaped in outline; the wall 

 consists of high cylindrical cells furnished with a pronounced basal 

 membrane (pl. V, fig. 27) A double staining with Delafield's 

 haematoxyline — eosine isometimes shows that the distal parts of the 

 gland cells are strongly eosinophile, exhibiting less affinity to the 

 haematoxyline ; nevertheless, in general, the protoplasm seems to 

 exhibit a rather pronounced affinity both to the haeimatoxyline, 

 and to the eosine. The nuclei are large; no w they are more basally 

 situated, now to be found more in the middle of the cell, and 

 exoeptionally they may even occur in the distal part of the cell. 

 The nuclei contain a strongly developed chroma,tic network, which 

 exhibits a pronounced affinily to Delafield's haematoxyline (pl. 

 IV, fig. 20) attaining an almost blackish blue colour; they are 

 bladder-shapied, and contain a large nucleolus, which, however, 

 shows a less pronounced affinity to the haematoxyline than the 

 other chrornatic coniponents of the nucleus, and which on the other 

 hand is strongly eosinophile, so that in doubly stained preparations 

 it attains a dark violet hue. — A treatment with Weigert's 

 haematoxyline — iron ammonium sulphate gives quite anotherpioture 

 (pl. IV, fig. 21); the network, or belter the granules of chromatine, 

 are less intensely ooloured, whereas the nucleolus is wholly blacke- 

 ned; the cells in this case lose most of their affinity to eosine. 



The digestive glands of Scalpellum Strømii display a strongly 

 pronounced secretorial function. The double staining with Dela- 

 field's haematoxyline — eosine serves best to give the picture of the 

 cells emptied of their secretions, and thus with cytoplasm of alveo- 

 lar structure (pl. IV, fig. 20); the treament with Weigerts haemat- 

 oxyline — iron ammonium sulphate gives the finest demonstration of 

 the råtner filamentary structure of the protoplasm of the cells in 

 function (pl. IV, fig. 21), the secretions, which are only slightly 

 stained, gather in the distal part of the cells. The filamentary 

 structure of the protoplasm is also easily seen in pireparations 

 stained with boraxcarmine — ^bleu de Lyon (pl. V, fi,g. 27). — The 

 entire gland, as above mentioned, is almost ball-shaped, and coni- 

 municates with the intestine through a short and narrow duct; 

 the latter bas a low, cubioal epithelium, land opens into the digestive 

 intestine just behind the stomach. 



It is difflcult to classify the glands in accordanoe with the hepatic, 

 hepatico-pancreatic, or pancreatic types as defined by Gruvel 



