this literature. The parts which refers to 
the parasite and its evolution gives my per- 
sonal, indepent and generally repeated 
observations, accompanied by original dra- 
wings. Where the work of the commis- 
sion under LEIPER had already cleared the 
ground, my personal observations agreed in 
all the essential points. The part refering ex- 
clusively tothe local conditions in Brazil is 
my own. The serial sections used for this 
paper came from more than fifty blocks and 
were mostly made in the anatomo-patholo- 
gical laboratory of this institute, then directed 
by Dr. OSCAR D’UTRA, and some by Dr. 
TRAVASSOS of this institute. They were 
examined by me, as all the others, made in 
my laboratory without the use of paraffinin- 
clusion. The patients who furnished the ma- 
terial for the numerous infections of snails, 
made by me, were sent by Dr. OSWINO 
PENNA, after he had observed eggs of Sch. 
M. in their stools. 
The Planorbis olivaceus, used in my stu- 
dies, were brought from Aracajú hy THEO- 
PHILO MARTINS, sent by the institute, or 
received from Bahia through the kindness of 
Prof. PIRAJA and Dr. OCTAVIO TORRES. 
When studying the fresh water shells, I com- 
pared the collections in the musea of Rio de 
Janeiro aud Sao Paulo. 
These studies occupied a great part of 
my time during more than two years (with 
many interruptions due to want of the ne- 
cessary materials). They were helped in many 
ways by the directors of this institute Drs. 
OSWALDO CRUZ and CARLOS CHAGAS, 
To them and the other colleagues already 
mentioned my best thanks cre given. 
In 1917 this paper was practically con- 
cluded and the plates were ready, but prin- 
ting was adjourned in order to present the 
work at the medical congress held in Rio in 
October 1918. The essential part was read in 
a lecture, accompanied by projections before 
an audience, already somewhat reduced by 
a sudden epidemic of influenza. This and 
other circumstances further delayed the prin- 
ting. Since this time only a few additions 
139 == 
have been made, in connection with the more 
recent literature. 
2. (Pg. 109, 1. 6 from the bottom of 
col. 1.) Schistosoma, derived from oz:orós split 
and odua body, is the Greck name for the 
worm and this gives Schistosomatosis as 
correct form. 
3. (Pg. 110, 1. 11 from top of col. 1.) 
The blood fluke named by SAMBON Schis- 
tosomum Mansoni is a good example of 
the difficulty of nomenclature. The generic 
name of DIESING is not only more carac- 
teristical but really anterior, though the record 
of the session in which it was announced, 
was published after the first paper of WEIN- 
LAND. The name of haematobium inclu- 
ded two species, of which one was first con- 
sidered new by HARLEY who namedit ca- 
pense. It seems to me that this name ought 
to stand. If the author did not recognize that 
his speies was part of haematobium, he had 
the excuse that the double shape of the egg 
in the same specimen of the egyptian blood 
fluke was considered established by an ob- 
servation of BILHARZ. This observation, 
used as principal argument by the unitarian, 
was most probably erroneous, as may be ea- 
sily supposed when we take in account that 
Mansoni has only one egg with shell. It has 
not been confirmed by any recent author and 
is invalidated by countless observations. If 
the name of HARLEY holds good, then the 
name of haematobium must be restricted to 
SAMBON’S Mansoni and might mean both 
species or each one of them. This might be 
prevented by suppressing the name haemato- 
bium and distinguishing between capense and 
Mansoni but this would be considered in- 
correct by many and would substitute a lit- 
tle known name for another already much 
used. In this emergency [shall continue to 
use the uame Mansoni, while the form with 
an apical spine on its egg wonld be haema- 
tobium (forma capense). 
4. (Pg. 111, 1. 7, from the top of col, 1.) 
Schistosomum and allied genera in mam- 
malia and birds: There is a considerable 
number of species which I enumerate in 
chronological ordre with their synonyms. 
