No. 413.] REVIEWS OF RECENT LITERATURE. 411 
the equal of Looss in deciphering, delineating, and comparing the 
anatomical structure of trematodes, and it would be hard to find, save 
in his own work, the equal of the nine plates he has given to illus- 
trate this work. Some mention is made of a total of eighty-four 
genera, including twenty-three old and sixty-one new ; of the latter, 
three are clearly antedated by names proposed by Braun, five corre- 
spond to groups named by Lühe in a publication of identical date,’ 
and four are provisional. Among the fifty-two species described 
twenty-four are new. One can only regret that the author did not 
give an index or table of contents, if debarred from forming a key 
by the incompleteness of his system. As it is, reference to any 
section or topic is not an easy matter. It may also be said that in 
rare instances the author fails to apply the principles he has laid 
down, without giving any reason for the exception ; but some slips 
are unavoidable in a work of such magnitude, and do not detract 
from its permanent value. Though Looss disclaims having formed 
any complete system, his work comes nearer that than any one else has 
yet reached, and will be the foundation on which such a system is 
to be built. H. B. W. 
BOTANY. 
Primitive Algz and Flagellata.* — In reviewing Dr. Blackman's 
paper, the writer has not mentioned the authorities for the arrange- 
ment given therein, which may be found on reference to the paper 
itself. The article is of the nature of a review of recent work, and 
the following is but a condensation of its most important points. 
e older arrangement of the Chlorophycez, given by Wille in 
Engler and Prantl's Pfanzenfamilien, is largely an artificial one, and 
consequently subject to changes. Of the three groups named by 
him, the Siphonez, Confervoidez, and Protococcoidez, only the first 
! It appears to me clear that both the intent and the wording of the rules 
covering the choice in case of synchronous appearance of different names for the 
same forms call for the preference of the extended discussion over the preliminary 
notice, certainly in all cases where types are named. Under this interpretation 
Looss's names stand as against Lühe's, save for Dolichosomum, which is pre- 
occupied, and hence gives way to Ithyogonimus Lühe rather than to Dolicho- 
desmus Looss (Zoo/. Anz., Bd. xxiii, p. 603) of later date. 
2 Blackman, F. F. The Primitive Algz and the Flagellata, an Account of 
Modern Work bearing on the Evolution of the Algae, Annals of Botany, vol. xiv, 
No. lvi (December, 1900), p. 647. 
