18 Fishery Board for Scotland. 



centre of the lesions was much degenerated. Small spherical 

 vesicles, averaging- about 03 mm., were present in the interfibrillar 

 tissue, or actually within the fibrils. Each contained a mass of 

 protoplasm, dividing into spores, more than eight in number. The 

 spores were oval in shape, and about 003 mm. by 0025 mm. No 

 polar capsule was made out, but that was possibly due to imperfect 

 preservation. 



The same zoologist observed in the muscles of Gadus luscus cysts 

 containing a gelatinous substance, and measuring 5 by 3 mm. 

 The cysts contained pyriform spores, *0035 bj^ -0025 mm. in size. 

 A small vacuole was present at the broader end of the spore ; a very 

 minute body at the apex probably represented the polar vesicle. 

 He gave this sporozoon the name Glugea shiplei. 



A haddock had embedded in the muscles immediately subjacent to 

 the lateral line a mass of brown, horny-looking substance. The 

 substance was hard, and cut readily. Minute spores of some 

 sporozoan, probably a species of Glugea were found. Drew 

 regarded it as a case of vitreous degeneration of the muscles, due to 

 a sporozoan infection. 



The parasite described above as infecting the muscles of Anarrhichas 

 lupus seems to be Pleistophora hippoglossoides, Bosanquet. 



Tumours. 



A number of fishes have been found that showed tumours in the 

 muscles. In some cases the mass of infected muscles could be 

 lifted out, leaving a clean cavity. The mass might be of a dry 

 consistency. Other cases were found where the tumour had become 

 purulent, and had eventually discharged through an opening it 

 had made in the skin. The cavity had then been filled up with 

 fibroid tissue. The infected myotomes are sharply denned from the 

 normal muscles by the aponeurosis septa, and when the muscles 

 break up and are discharged the aponeurosis grows into the space, 

 filling it up with fibroid tissue. The origin of these diseased 

 regions was not made out. 



A codling had a swelling noticeable on the outside of the body. 

 On removing the skin a large yellowish mass of columnar structure 

 (hardened muscle) was found lying on both sides of the dorsal spines 

 (fig. 169). The two masses were connected through three of the 

 spaces between the dorsal spines. They measured 4 inches (10 cm.) 

 by 1 inch (2 - 5 cm.) and 5-1- in. (14 cm.) by § inch 2 - 2 cm.). The 

 masses could be lifted out clean, leaving large cavities extending 

 laterally from the skin to the vertebral column. The infection had 

 taken place simultaneously on both sides of the body. The mass 

 of muscle has become hardened and dried to some extent. Its fibres 

 are whitish to the naked eye. Numbers of white bodies were 

 observed in the skin bordering the cavity. A pair of similar masses 

 were present in the ventral half of the body. They appear to 

 have communicated between the vertebral spines. 



In a saithe a tumour formed a deep cyst in the muscles. It was 

 bounded by a tough fibrous capsule, which was well supplied with 

 blood-vessels. The capsule belonged to the healthy tissue. The 

 enclosed matter was quite separate from the capsule. It was in 

 part columnar in structure, brownish in colour, and of a pasty, 

 dryish consistency. Little white and brown bodies, 5 and 1 mm. 



