T RAN S ACTION S OF THE ROYAL MICROSCOPICAL 
SOCIETY. 
Some Remarks on the Parasites found in the Nerves, 
&c., of the Common Haddock, Morrhua oeqlefinus. By 
R. L. Maddox, M.D. 
(Communicated by G. Busk, Esq., F.R.S., F.R.M.S., &c.) 
(Read June 12th, 1867.) 
Although the “ spheroidal bodies,” the subject of the 
present communication, were discovered and partially de- 
scribed by Monro secundus, much more fully investigated by 
Professor Sharpey in 1836, who was in the habit of men- 
tioning them in his lectures at the University College, and 
subsequently by Mr. H. Goodsir, whose paper “ On the 
Anatomy and Development of the Cystic Entozoa,” read 
before the York meeting of the British Association, 1844, 
was published in ‘ Goodsir’s Anatomical and Pathological 
Observations, 1845 f still, from the interest that attaches to 
all knowledge of Parasitic life, whether vegetable or animal, 
from the scarcity of the last-named work, as well as from the 
difficulty attending the correct investigation of the structure 
and relationship of these peculiar creatures, I am induced to 
offer the accompanying notice as a further elucidation of their 
organization, with some general remarks. To my friend 
Professor Aitken, of the Victoria Hospital, Netley, I am 
indebted for calling my attention more particularly to these 
bodies, as a subject worth more extended examination. 
Dr. Monro, secundus, found peculiar “ spheroidal bodies” 
existing on the surfaces of the brain and nerves of the Gadidae, 
which are known to be encysted entozoa containing a living 
parasite, similar to Distoma. I have noticed them chiefly "on 
the nerves, and more particularly on the caudal nerves, 
extending in some fish of about fourteen inches long, to two 
and a half inches upwards from the tail. On making an 
incision along the caudal extremity over the spinal column of 
the common haddock, and carefully dissecting back the 
muscles, the series of nerves as they pass out from the spinal 
vol. xv. h 
