NOTES ON SPOEOZOA II. 
185 
forms iu question are phases in the life-history of one and the 
same species of parasite, receives no considei-ation, and no 
attempt is made to connect the various types by means of 
intermediate stages. I am g'lad to see that Laveran and 
I’ettit, in a recent note (15), also express a similar opinion, and 
comment upon the confusion liable to be caused by creating 
new species in the above casual manner. 
To begin with the original description of Hasmogregarines 
from lizards, i.e. the account given by Danilewsky (6), this 
author observed various forms of the para, sites in L . ag i 1 i s and 
viridis. Making all allowance for the fact that Danilewsky^s 
description and figures are mostly based on observations on the 
living parasites in the drawn blood,' and also for the primitive 
character of microscopical technique iu those days, it seems 
probable nevertheless that this author was actually dealing 
with more than one species. Here, as in other cases (tor 
instance, his memoirs on Ti'ypanosomes), it is extremely diffi- 
cult to gather what Danilewsky intended to mean by his 
grouping of different forms and the nomenclature he apjdied 
to them, lie distinguishes three intra-cellular types (a, B and 
c), which he regards as having a genetic connection (‘‘ lieu 
geneticpie ”) with one another. To these, collectively, he 
gives the name llmmogi'Cgarina lacertic; but imme- 
diately afterwards the secoml type (b) is termed Drepani- 
dinm lacertarum, because it is smaller and younger; while 
in another part of the memoir the third form (c) is called 
iltomocy tozoon clavatum ! The last type is generally 
considered to be distinct; this is, 1 think, most likely, 
particularly since it does not produce, to judge from Dani- 
lewsky’s account, hyj)ertrophy of the blood-corpuscle and 
alteration of its nucleus; in other words, it is apparently 
‘ While, of course, for iinmy points, e. g. l)eluiviour, movement, living 
t)l>serviitions are invalualile, it cannot he pretended that such can he 
relied upon whei’e comparative (piestions of size, form and iidiuite 
structure are concerned, especially in the case of intra-cellular hlood- 
2'arasites, which, as is well known, frecpiently alter or else become 
deformed in drawn blood. 
