No. 407.] REVIEWS OF RECENT LITERATURE. 9OI 
whose relations are uncertain and concerning whose life history 
nothing has yet been ascertained, could be satisfactorily mono- 
graphed at this time. Even the brief interval which has intervened 
since the completion of the book has furnished positive evidence that 
certain genera, Eimeria and Pfeifferella, are merely developmental 
stages in the evolution of other forms, a relation which, by the way, 
is noted as a possibility in the description of some species in the 
text. With this the entire tribe of PoZy//astina monogenica probably 
disappears, as the species are incorporated into the life history of 
others in the P. digenica. Similarly, in the Oligoplastina the single 
species of Trisporea is but a chance variation of the usual four- 
spored condition of that form, and thus another tribe falls out. 
The two orders of Hazemosporidiida and Gymnosporidiida are distin- 
guished by the presence of a gregarine stage and of a cyst in the 
former, and by their absence in the latter. Recent discoveries on 
the life history of the malarial parasite have shown that this distinc- 
tion will not hold, and apparently the two orders are much nearer 
together than most of the families given in the synopsis. In the 
classification of the Myxosporidia, Labbé has followed Thélohan very 
closely and has attained a less artificial system than that of Gurley. 
Under the Sarcosporidia, however, the result is less satisfactory, and 
in the present ignorance concerning these forms it is not clear that 
anything has been gained by the suppression of Blanchard's genera, 
Miescheria and Balbiania, a movement in which the author is not 
likely to be followed at present, at least. 
A considerable number of changes in generic and specific names 
were necessary where the earlier names were preoccupied; it may be 
questioned, however, whether changes in spelling, e.g., Plistophora 
for Pleistophora Gurley, do more than add to the already heavy bur- 
den of synonyms. Among familiar names which have been sup- 
planted necessarily may be noted Glugea, antedated by Nosema, 
Proteosoma by Hzmoproteus, and Drepanidium preoccupied and 
replaced by Lankesterella. In glancing over the list of genera cur- 
rent among the Sporozoa one cannot help being struck by the 
dedicational-phobia which has afflicted students of the group! 
Among the large number of uncertain genera and species listed, 
some are capable of being precisionized : thus, of the fifteen doubt- 
ful species of Gregarinida briefly described by Leidy, the unpublished 
drawings for his monograph on the group are still in existence and, 
it is to be hoped, may be published with satisfactory descriptions. 
Others of the sf. ing. are yet under discussion and will ultimately be 
