190 
IIAEMOGREGARINA ANARRHICHADIS FROM 
ANARRHICHAS LUPUS, THE CATFISH. 
By HERBERT HENRY, M.D. 
{From the Department of Pathology, University of Sheffield.) 
(With Plate VIII.) 
The haemogregarine which is the subject of the present com¬ 
munication was obtained in material collected by me during two 
voyages made in a trawler in July 1910, round the Shetlands and 
the north coast of Scotland. It was found in large adult specimens 
of catfish (Anarrhichas lupus), taken by otter trawl from a depth 
of 50 to 80 fathoms, in the vicinity of Fair Isle and Foula, and 
on Whitenhead Bank about nine miles to the N.N.E. of Cape Wrath. 
Catfish taken near Rhona and Sulisker in the Atlantic showed no 
infection, but the number of fish examined was so small that one could 
not assume the infection to be absent in this locality. 
Films were made with blood taken directly from the heart. They 
were allowed to dry in air, then fixed in absolute methyl alcohol for 
30 minutes, and packed in oiled paper to be stained at the laboratory 
later. The description I am about to give of the parasite applies 
therefore only to the appearance it presents in these films stained with 
Leishman or Giemsa. It is of course impossible to microscopically 
examine fresh blood on board a modern commercial trawler while it is 
on the fishing grounds, and attempts to obtain wet-fixed films end in 
disaster. The preparation even of air-dried films is beset with many 
difficulties and disappointments, which only those can fully realise who 
have attempted such work in rainy weather and on stormy seas. 
