200 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
growth is not the result of a parasitic invasion. Neither 
is it a healing tissue, as in the case of Plaice A. There 
are no indications of a wound. The tumour is attached 
to the integument by a comparatively narrow base, and 
it is even slightly constricted at its insertion. We cannot 
conceive of a healing tissue growing out in the manner. 
of the growth in question. I conclude, then, that it is a 
true tumour—a fibroma. Histologically it consists of 
dense fibrous tissue, hard and compact as a rule, but here 
and there with slight spaces. There are also aggregations 
of connective tissue cells, but the wavy fibrous bundles 
are the predominant tissue. It does not appear to have 
any of the characters of a malignant growth, being 
apparently well bounded, though not encapsulated at its 
periphery. There may, indeed, be a permeation of the 
surrounding tissues, but from the nature of the growth it 
is difficult to be sure of this. 
An abnormal specimen of the Brill. 
In May, 1908, Dr. Jenkins sent me an abnormal 
specimen of the brill (Rhombus laevis), which had been 
forwarded to him by a fisherman. The head of this 
specimen is represented in fig. 18, and it will be seen that 
a condition frequently seen in various flat fish is present, 
viz., a partially arrested metamorphosis, the effect of 
which is manifested in the incomplete translation of the 
right eye. In a pleuronectid fish the shifting of one eye 
from its morphological proper side precedes the growth 
forward of the dorsal fin in the pseudo-mesial line. It 
sometimes happens, however, that this shifting of one of 
the eyes to its definitive side is delayed, or does not 
completely occur. Then the anterior growing extremity 
of the dorsal fin arches over this eye; perhaps it may 
later on tuse with the preocular part of the head, but as a 
