408 The American Naturalist. (Ma, 
Railliet had reached the same conclusion independently and formed 
for them the genus Stilesia. Its anatomy is discussed here. 
` Part IV, the discussion of species inquirend, is followed by a short 
half page on the life history, and two pages of general conclusions. 
Here is included a key for the determination of species. It is undoubt- 
edly more difficult to use than those of Moniez or Neumann, and on 
that account will no doubt be criticized and perhaps disregarded by 
some; it is, however, more accurate and allows a determination of the 
species as well as the genus, which heretofore has not been possible. 
Part VII is a valuable compendium of species according to hosts with 
commendable cross references. In the addenda the fact of the gradual 
failure of the interproglottidal glands to stain as the material macer- 
ates, and the consequent possible identity of some species are dis- 
cussed. 
- The bibliography given is very full and under each title is a word or 
two of valuable explanation. Yet it is on the whole the least satisfac- 
tory part of the paper. One could wish that the authors had used a 
better system of reference than by numbers; these differ of course in 
the bibliography of each species and in the general list, and the con- 
fusion could not but lead to mistakes. Had the year system been used, 
references would have been alike for all lists, and such an error as 18 
noted on p. 32, where “my note (26) ” refers actually to a book by 
Dewitz, would not have been possible. Apart from the system, a 
ever, some omissions are noted. Thus on p. 26, and again on p. 42, in 
- the synonomy, Blainville is quoted “after Baird, 1853,” but ne 
name can be found in the general or in the special bibliogr aphical list. 
The same can be said of Mégnin p. 87. The habit of scattering refer- 
ences at the bottom of the page (p. 66), or through the text (p. 12), 
also seems open to criticism. 
. These are, however, but slight defects in a work which 
whole so worthy of high praise. As the first scientific study of ta- 
onomical helminthology which has been made in this country, 1$ 18 
ting that it should have eminated from the zoologist of the Bureau z 
Animal Industry. It is, to be sure, purely scientific work; but 6 
~ practical and economic value are correctly insisted upon by the Y 
of the Bureau in his letter of transmittal already quoted. of 
Bureau is to be congratulated also upon the general appearance work 
bulletin and especially upon the sixteen fine plates which are the 
is on the 
of its artist, Mr. Haines. ` tant 
: The Bureau does great service in offering to museums and ge: 
collections well preserved specimens of these tape-worms !P 
exchange 
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