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TT. M, WOODCOCK. 
opinion, a t}'pe rather different from any phase so far described 
by other workers, and from anything I have observed. It is 
a large, curved form, certainly a Karyolysus, because of its 
effect on the cell-nnclens ; I should say it probably represents 
another phase of K. Iacerta 3 , but until the life-cycle is 
better known or until this form has been connected by inter- 
mediate stages with other known phases, the matter must 
remain uncertain. 
Frau9a, in a series of papers on the Ilfemogregarines of 
lizards, chiefly species of Lacerta, has been unfortunately 
preoccupied with the idea that almost every variety in form 
and appearance of parasite observed represents a distinct and 
independent type, with the result that he has greatly compli- 
cated and confused the subject of these Ilfemogregarines of 
lizards. Thus, in more than one case, the author creates 
several new species for parasites from the same host, in some 
instances basing the distinctions between them on such slender 
grounds as the different staining appearances (tint of colour, 
presence or absence of granulations, etc.) exhibited. Now, 
Frau9a’s figures are all from preparations stained by some 
modification of the Eomanowsky method ; and, as is well 
known, the great variability and uncertainness in the staining 
appearance presented often by the same object at different 
times, even where the smear has been treated, so far as was 
known, in exactly the same manner, renders it perfectly 
useless to label as distinct species forms showing differences 
in appearance after being stained by a Romanowsky method, 
mainly or solely on this ground. Again, Frau9a is of the 
opinion that it is unlikely that a particular species of host 
will be infected with the same species of parasite in different 
countries, or even in different districts of the same country. 
I can only say I do not share this view at all. We know, for 
example, that Trypanosoma lewisi occurs in rats all over 
the world; and other common pai’asites, e.g. certain Grega- 
rines and Coccidia, are known from the same species of host in 
various countries. I do not think there is any reason to doubt 
that the same species of Ilminogregarine may occur in the L. 
