62 
Diseases of Fish 
DESCRIPTION OF PLATE IX. 
Figs. 1, 2, and 3. To illustrate ‘ Glugea shiplei, a new Sporozoon parasitic in the 
muscles of Gadus luscus.’ 
Fig. 4. To illustrate 1 Two cases of abdominal tumours occurring in Pleuronectes 
platessa.’ 
Fig. 5. To illustrate ‘A remarkable case of “Vitreous” degeneration in the muscles of 
Gadus aeglefinus due to Sporozoon infection.’ 
Figs. 6 and 7. To illustrate ‘A ease of Epithelioma papulosum in Pleuronectes platessa .’ 
Fig. 1. x 10. Section through a cyst, showing the trophozoit in which spore formation 
has begun, giving rise to a dense spherical mass of spores. 
Semi-diagrammatic, the nuclei and spores are relatively too large. 
Fig. 2. x 2,000. A single spore, showing vacuole and polar capsule. 
Fig. 3. x 350. Section through the trophozoit, cyst wall and subjacent muscular tissue. 
The various nuclei of the trophozoit are shown, and the central condensation of the 
protoplasm containing pansporoblasts in an advanced state of development. Pan¬ 
sporoblasts in earlier stages of division are seen irregularly distributed in the 
protoplasm. The condition is a little less advanced than that shown in Fig. 1. 
Fig. 4. x 350. Section through larger tumour, showing tissue resembling an adeno¬ 
carcinoma above, and tissue resembling a lipoma below. 
Fig. 5. x 350. Section across muscle fibres that have undergone complete ‘ vitreous ’ 
degeneration, many are invaded by leucocytes, and there is an overgrowth of fibrous 
tissue between the muscle fibres. 
Fig. 6. x 350. Vertical section through one of the papules, showing great hyperplasia of 
epidermal cells which rest on the pigment layer of the dermis. 
Fig. 7. x^. Showing distribution of papules on ocular surface of fish. 
