8 Fishery Board for Scotland. 



dark-green embryos are seen enclosed in what appear to be vessels. 

 In the figure the green embryos are shown shaded. Surrounding the 

 embryos there is an amber matrix (l>r.) The embryos are opaque, but 

 segmentation can be made out. The long embryos had usualfy no 

 brown matrix round them, although a brown colouration was observed 

 near one. They are enclosed in a tough vessel, which shows 

 branches. None of the embryos were made out to be mobile. The 

 parasite grows into long green columns. Fig. 71 represents a portion 

 of the parasite. The green columns are made up of large round cells, 

 so far as could be made out. The columns are bound together. The 

 part of the vessel in front of the column is very narrow (v.) The green 

 bodies are sparkling bright under the microscope. There are in some 

 cases j^ellow cells inside the columns. They are, I think, blood 

 corpuscles inside the vessel and surrounding the green columns. 



What is evidently an early stage of the parasite is shown in fig. 68. 

 I do not think that the space in which the ovum rests should be 

 regarded as merely an intermuscular space. 



Fig. 72 is a drawing made of a section of the parasite. Several 

 columns are shown cut across. Yellow cells (blood corpuscles) are 

 seen at y. Between the muscles at r. the connective tissue is slight 

 and light in colour. At the right side it is denser. 



On teazing up the muscles a row of white granular bodies running 

 along between the muscle bundles and scattered over the muscle 

 were seen. 



A capsule found detached among the fibres measured '3 mm. in 

 outside diameter (fig. 77). It had a thick cyst wall enclosing an ovum 

 which had a green embryo. The ovum measured '17 mm. and the 

 green embryo about - 07 mm. in greatest length. The capsule is 

 white to the naked eye. There were traces of segmentation in the 

 embryo and ovum. The rind of the capsule was a soft fluffy laj^er in 

 which hardly any structure could be made out, but it was covered 

 with minute refractile granules. The capsule was quashed (fig. 74). 

 The green embryo (n.) appeared to be composed of small cells. It 

 was enclosed in a soft cellular mass (ce.), while outside was the soft 

 rind (ol.). 



When the fibres are torn apart the parasite is sometimes ruptured. 

 Along the central part of the infected area, which was attached to a 

 broad aponeurosis, there was a great mass of fibrous tissue which 

 enclosed buds and green columns in a big mass. 



I have not been able to find that this parasite has been already 

 described, and I propose for it the name Boles trelis. 



Columnar Disease. 



A small cod was infected throughout its muscles with arnber- 

 coloured bodies. They were bundles of hard columns. In fig. 60 

 a bundle is shown enlarged. The columns were solid rods which cut 

 like cheese. There was evidence of branching of the columns. The 

 bundle was enclosed in an investment. The part of the bundle 

 exhibited dotted was rather paler than the rest. A section of a 

 bundle is shown in tig. 70. Some of the central cells have more 

 granular contents than the others, in which the contents were of a 

 clear yellow colour. The section was thick, and its minute 



