300 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
securely defined species in these four genera, and briefly discusses the 
Flagellata in general. 
Protozoa of Salt Lakes.* — Dr. P. Butschinsky has studied the Pro- 
tozoa found in two salt lakes or Limans near Odessa. They are more 
abundant in the lake with the less salinity, and they consist partly of 
freshwater and partly of marine species. The fauna of the two lakes is 
not the same, and in both cases very striking fluctuations occur. 
New Radioiarian.f — Herr W. Karawaiew has secured another speci- 
men of the remarkably simple new Eadiolarian which he described last 
year, from Villafranca.J It has six diametral spicules in pairs, and is 
a spherical cell with a delicate external pellicle covered with minute 
papilliform elevations. 
New Holotrichous Infusorian.§ — Herr M. Rimsky-Korsakow de- 
scribes Dinobrya cylindrica sp. n., found in the water tank of the Zoo- 
logical Institute of St. Petersburg. The position of the mouth, the 
general shape, the ciliation, &c., point to its being a species of Dinobrya, 
of which D. LieberJdihni has been hitherto the only named form, though 
Lieberkiihn and Eberhardt seem both to have observed the species 
under discussion. It differs from D. LieberJdihni in its cylindrical 
shape, in having 1G rows of 20-22 cilia instead of 20 rows of 16-18, and 
in the shape of the macro-nucleus, which is not spherical but slightly 
horse-shoe-shaped. The author refers the genus, as Schewiakoff does, 
to the family Cyclodina, in which it represents a fiist stage in the ten- 
dency to reduction of cilia. 
Species of Trichodina.|j — Herr Hs. Wallengren describes Trichodina 
pediculus Ehrenberg, which he found on Gastrosteus punzitius and other 
freshwater fishes, as Zvennerstadt also did. The same form was found 
by H. James-Clark on Hydra, and minutely described. The previous 
description is in part amplified and in part corrected by Wallengren. 
He also describes Trichodina miira v. Siebold from Planaria lugubris. 
New Gregarine.^ — MM. A. Labbe and E. G. Racovitza describe 
Pterospora maldaneorum g. et sp. n., parasitic in Leiocephalus leiopygos 
and (?) Clymene lumbricoides at Roscoff. It is an acephalous pyriform 
Monocystid, with two groups of four digitiform retractile prolongations 
at the narrow end. Two individuals always occur together, united by 
the swollen ends. Spherical or oval cysts are formed after the encap- 
suling of two individuals. They do not sporulate separately. The cysts 
dehisce by simple rupture. The spores have dissimilar poles and eight 
(?) falciform sporozoites. 
Coccidia of Myriopods.** — M. L. Leger finds in Lithobius impressus 
a new polysporous monozoic Coccidian parasite, allied to Barroussia. 
The genus Coccidium , characterised by a strong tetrasporous cyst with 
dizoic spores, is not quite confined to Vertebrates, as is usually believed ; 
* Zool. Anzeig., xx. (1897) pp. 194-7. t Tom. cit., pp. 190-4. 
t Cf. this Journal, 189G, p. 427. 
§ Biol. Ceutralbl., xvii. (1897) pp. 257-60 (1 fig.). 
i| Tom. cit., pp. 55-G5 (6 figs.). 
*1 Bull. Soe. Zool. France, xxii. (1897) pp. 92-7 (4 figs.). 
** Comptcs Rcntlus, exxiv. (1897) pp. 901-3. 
