96 Dr, F. Vejdovsky’s Contributions to the 
Figs. 87 and 38. Plocamium coccineum, Lyngb. 
(Spirit-material.) 
Fig. 37. Young fruit-rudiment at the period of fertilizable maturity. A 
spermatium has conjugated with the extended trichogyne. 
x 150. 
Fig. 88. Longitudinal section through a still younger fruit-rudiment, the 
apex of the trichogyne of which has not yet got free, An in- 
ternal tissue-cell (a) has developed, as a secondary side-branch, 
a three-celled carpogonial branch (e ec), and itself become de- 
veloped into the auxiliary cell, extending a conjugation-process 
towards the ventral part of the carpogonium. The trichogyne 
is much inflated in aclavate form above the neck before, breaking 
through the surface of the thallus with its dense cuticle, it pro- 
trudes as a long thin hair. xX 400. * 
Fig. 39. Caulacanthus ustulatus, Kiitz. 
(Spirit-material.) 
Longitudinal section through a young fruit-branch ; mm, central axis. 
A side-branch of this central axis bears laterally on a joint-cell 
(d) the carpogonial branch (e@ ec). The lowest cell of this 
grows into a sterile rhizoidiform thread. The uppermost cell 
has developed into the carpogonium ; its ventral part has be- 
come segmented off after fertilization, and has grown out 
into a single ooblastema-thread, which, branching abundantly, 
coils itself about the central axis. At X originated another 
ramified side-branch of the ooblastema-thread, which spread 
out upon the under surface of the central axis, but has been 
omitted in the figure for the sake of distinctness. x 400, 
X.—Contributions to the Knowledge of the Freshwater 
Sponges. By Dr. F. Vrspovsky, of Prague. With Re- 
marks by H. J. Carter, F.R.S. &e. 
[Plate VI.] 
THE above is a translation of the Title of a memoir commu- 
nicated by Dr. F. Vejdovsky to the Society of Science in 
Prague, on the 12th October last, and since printed in the 
Bohemian language, with the following Résumé in German :— 
RESUME*, 
In my monograph of the freshwater sponges of Bohemiat 
I left two questions, among others, open, to be answered by 
subsequent investigations. 
The first question relates to the multiform ‘ Ephydatia 
* Translated from a separate impression of the Memoir sent by the 
author to Mr. H. J. Carter, F.R.S. 
+ “ Revisio Faunze Bohemice. Pars I. Die Susswasserschwamme Boh- 
mens.” Von Dr, Franz Vejdovsky in Prag (mit 3 lithographirten Tafeln). 
Abhandl., d. k. Bohm. Gesellsch, der Wiss. Folge 6, Band xii. 
