794 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
y. Platyhelmintlies. 
Sommer’s Plasmatic Vessel in Taenia.* * * § — Prof. F. Blochmann 
recalls the views, nearly all adverse, which have been published since, 
in 1878, Sommer described plasmatic vessels in Tsenia saginata and 
T. solium. He is for both of these species able to completely support 
the accounts of Sommer and Nitsche, as he has been able to trace the 
course of the vessel with ease. So satisfied indeed is Prof. Blochmann 
with Sommer’s account, that in place of giving a description of his 
own, he cites a long passage from that author in which he finds but few 
points to correct. It is suggested that the granular deposits which are 
often found in the organs of Tsenia saginata and T. solium are generally 
due to drugs introduced into the intestine of the host; at any rate, 
these coloured deposits have only been seen in tapeworms that have 
been taken from the human subject. 
5. Incertse Sedis. 
Distribution of Rbtifers.f — Dr. 0. E. Imhof notes the following 
occurrence of marine and brackish water Rotifers, 9 in the Baltic, 25 
in the North Sea, 1 in the Irish Sea, and 7 in the Mediterranean. The 
North Sea contains 23 species not as yet observed elsewhere. Of 
“ eurhyaline ” forms which occur both in fresh and salt water 40 species 
are recorded. 
Revision of the Genus Asplanchna and its Hungarian Repre- 
sentatives.J — In this paper Dr. E. von Daday tabulates and describes 
the known species of Asplanchnse ; he recognizes the following nine 
species : — 
A. priodonta, A. Jierrickii , A. syrinx , A. brightwellii , A. amphora , A. 
sieboldii , A. intermedia , and A. ebbesbornii. 
A. helvetica and A. Jcrameri are declared to be synonymous with 
A. priodonta and probably rightly so. 
But it is not quite clear why the author has admitted A. syrinx , 
which, according to Ehrenberg, has a foot, and which on this account 
has been placed in the genus Asplanchnopus by Hudson and Gosse. 
A. girodi of de Guerne is more probably synonymous with A. bright- 
wellii than with A. syrinx. 
Dr. v. Daday, in describing the troplii of Asplanchna , states that the 
two thin blades (Reservekiefer) situated outside the stout rami, are 
mere appearances produced by folds of the membrane of the mastax, 
a statement which is hardly correct. 
New Rotifers.§ — Dr. D. Bergendal in a preliminary notice states 
that he has founded a new genus Gastroschiza for G. triacantha, a remark- 
able new species closely allied to Euchlanis lynceus of Ehrenberg, 
which he refers to his new genus. He states that in his complete work 
he gives reasons for showing that it must form the type of a new family 
of Rotifers, not obviously allied to any already known. Another new 
* Centralbl. f. Bakteriol. u. Parasitenk., xii. (1892) pp. 373-9 (3 figs.). 
f Biol. Centralbl., xii. (1892) pp. 560-66. 
j Math. u. Naturw. Berichte aus Ungarn, ix. (1801) pp. 69-89 (2 pis.). 
§ Lunds Univ. Arsskrift, xxviii. (1892) 2 pp. (sep. copy). 
