194 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
The 4 Corallia Baltica ’ of Linnaeus.* * * § — Herr G. Lindstrom gives a 
brief account of the sad fate of Linnasus’s collections of fossils, and 
traces the history of the dissertation known as ‘ Corallia Baltica.’ It 
is often ascribed to Fougt, a mistake which Lindstrom explains. It is 
enough that Linnaeus speaks of the work as his own. Lindstrom has 
taken pains to identify, as far as possible, the forms there described and 
figured. Twenty- three species are dealt with, of which eighteen can 
with certainty be referred to their name, and four with some doubt, 
while one is indeterminable. 
Porifera. 
Sponges of France.f — M. E. Topsent continues his monographic 
account of the sponges of France, dealing now with the Carnosa — the 
second order of the sub-class Demospongiae. 
He divides the order Carnosa into three sub-orders: — (1) The 
Microtriaenosa, provided throughout their thickness with tetractinellid 
spicules, forming triasnes with short rhabdome, and often remarkably 
decorated, and also provided with microscleres of some sort, including 
Dercitus Gray, Corticella Sollas, ffliachella Sollas, Tripiolemus Sollas, 
Thrombus Sollas, and Sanius Gray. 
(2) The Microsclerophora, provided only with tetractinellid spicules 
of small size, and in Oscarella with none, also without distinct micro- 
scleres ; including Corticidae, Placinidae, and Oscarellidae. 
(3) The Oligosilicina, without tetractinellid spicules, sometimes 
without any spicules at all ( Chrondrosia , Thymosia ), with microscleres 
in Chondrilla ; including the single family Chondrosidae. 
The author describes the eleven known French species, and takes a 
general survey of the order. 
Protozoa. 
New Protozoa.j — Herr B. Lauterborn describes some new Protozoa 
from the Oberrhein : — Amphitrema rhenanum sp. n., distinguished from 
the two known species by its elongated, sparsely encrusted test and the 
small number of pseudopodia ; Thciumatonema setiferum g. et sp. n., 
referable to the Mastigopliora, with two sluggish flagella and numerous 
mobile branched pseudopodia ; Vacuolaria depressa sp. n., differing from 
V. virescens Cienk. in its flattened, almost heart-shaped form, and a 
somewhat unusual mode of emptying its vacuoles ; Chrysosphserella 
lorujispina g. et sp. n., a spherical monad colony beside Synura and Mallo- 
monas , but with a peculiar Heliozoon-like appearance due to radiating 
flinty spicules; Eyalobryon ramosum g. et sp. n., related to Dinobryon, 
but with tubular cases round the individual cells ; and Peridinium pala- 
tinum sp. n. 
Hydrostatic Apparatus of Radiolarians.§ — Dr. K. Brandt discusses 
the floating, sinking, and rising of Sphserozoa and Collidae. They float 
passively and do not swim ; but as the floating is due to the gelatinous 
substance and vacuolar fluid, which give the organism the same specific 
gravity as the water, a change in jelly and vacuoles may cause sinking 
* Ofversigt K. Vetensk.-Akad. Forhandl., iii. (1895) pp. 615-41. 
t Arch. Zool. Exper., iii. (1895) pp. 493-590 (3 pis.). 
% Zool. Anzeig., xix. (1896) pp. 14-8. 
§ Zool. Jahrb. (Abth. Syst.), ix. (1895) pp. 27-74. 
