SEA-FISHERIES LABORATORY. 103 



is unfortunate that this definitive stage could not have 

 been observed. 



2. Haemangioma in the Eye of a Stickleback. 



A three-spined Stickleback (Gasterosteus purigitius) 

 caught among some shrimps was very noticeable because 

 of a tumour on the left eye. The pupil was surrounded 

 by a raised annular swelling, brown in colour, and the 

 cornea was mottled with opaque specks, while small 

 arborescent growths stood out from its central parts. The 

 thing looked so queer that sections were made. The fish 

 had been preserved in formalin, but the tissues were in an 

 excellent state for histological examination. 



Fig. 1 of Plate VII represents a section passing 

 transversely through about the middle of both eyes. The 

 lenses are entire, but the retina and choroid have become 

 retracted away from the sclerotic. The stippled area 

 between choroid and sclera is the choroidal gland. 

 Bones and blood vessels are shaded dense black. The two 

 bones on the dorsal side of the head are obviously the 

 frontals, and that just above the pharynx is the para- 

 sphenoid. The others I have not identified. 



The tumour is represented in the figure by the darkly- 

 stippled area outside the eye on the left (the section is 

 seen from behind). The cornea of this eye is also seen to 

 be thickened, and there are growths on the conjunctiva. 

 The tumour extends dorsally along beneath the skin to 

 the region of the right frontal, and ventrally, also 

 beneath the skin, to the level of the pharynx. There are 

 two large spaces beneath the eyes, lymph-spaces, but I 

 have not traced them, and these are partially filled with a 

 loose tissue consisting of blood capillaries and numerous 

 lymphocytes. All parts of the tumour stain, as does a 

 knot of blood capillaries. 



