SEA-FISHERIES LABORATORY. 185 



lying close together, and shining through the peritoneum. 

 The fresh intestine was precisely similar to that of the 

 second specimen, which is represented in Plate D, fig. 1. 

 On cutting open a portion of the gut it was seen to have a 

 much reduced lumen. The wall was 3 or 4 mm. thick. 

 Its internal surface was thrown into close set and deep 

 longitudinal folds pursuing a zigzag course. All the 

 surface of these showed the same round white bodies pro- 

 jecting from their surfaces. 



The stomach was normal in form and relations except 

 that its walls seemed thinner than usual. No food con- 

 tents were present. In the modified portion of the intes- 

 tine there were traces of decomposed food matter. A few 

 fragments of Lamellibranch shells were found, and were 

 identified as young Donax vittatus. 



The second specimen, sent by Mr. Scott, was the 

 intestine of a female plaice 11 inches long. It had been 

 preserved in corrosive-acetic fixative before reaching here. 

 From Mr. Scott's description the fish seems to have been 

 quite normal in other respects. The ovaries were of 

 normal size and relationships. 



Almost the entire post-pyloric portion of the intestine 

 in this specimen was modified in precisely the same way 

 as in the other case described above. Fig. 1 represents a 

 portion of the intestine of this fish. The maximum 

 diameter was about 1 inch. This thickest portion lay 

 immediately behind the stomach. The pyloric caeca could 

 be recognised, but were greatly flattened out. Near the 

 anus the inclusions in the wall became fewer, and a small 

 portion was free from them. No traces of food matter 

 could be recognised in the lumen. 



Pieces of both intestines were hardened in alcohol, 

 embedded in paraffin, and sections were made. Fig. 2 

 represents a small portion of the wall of the first specimen 



