Sottas—On the Origin of Freshwater Faunas. 107 
for here inserting the following list, compiled from a monograph on its Inverte- 
brate fauna, by O. A. Grimm, which appeared in 1876 and 1877, with 273 pages 
of letterpress, nine plates, and a folding map. As, with the exception of the 
scientific names of species, it is written throughout in Russian, I have to regret that 
I am not able to extract any further information from a work* which must be a 
veritable mine of interesting facts :— 
Ruizopopa. Piscicola respirans (Trosch.) 
Heliogod. = littoralis (Johnst. ) 
Protastrum marina (Grim. ) C eas ies (Grm.) 
Schulzia pelagica (Grm.) is ni (Diesg.) 
“GO PLATYHELMINTHES. 
Heliosphera ? heckeli (Grm.) 
Foraminifera Distomum tumidulum (Rud.) 
Rotia veneta (M. Salch.) Amphilina foliacea (G. Weg.) 
Textularia caspia (Grm. ) Ligula monogramma (Crepl.) 
L. digramma (Crepl.) 
INFUSORIA. 
Acineta tuberosa (Ehb. ) NEMATODES. 
Lacry et ae Va (Grm.) Monhysteria bulbosa (Grm.) 
Paramecium, SE. Eustrongylus tubifex (Nitsch.) 
Colpoda pigerima (Cohn. ) | Ascaris cuneiformis (Rud.) 
Nassula flava (Clp.) Ne ncas (Bloch.) 
Pleuronema (?) A. A. constricta (Rud.) 
Climacostomum longissimum (Grm. ) 
Euplotes charon (Ehb.) (?) ACANTHOCEPHALA. 
Stylonichia, sp. d 
a (Grm.) Echinorhyncus strumosus 
Carchesi 
eee OLIGOCHATA, 
SPONGIE. f 
; ; Nais, sp. 
Amorphina caspia (Grm.) Tubifex deserticola (Grm.) 
Reniera flava (Grm.) Limnodrilus bogdanowii (Grm.) 
Metschnikowia tuberculata (Grm.) Limnodrilus, (?) sp. 
M. intermedia (Grm.) (larval form). Enchytreus, sp. 
TURBELLARIA. re invalida ( ae 
: . brevispi b. 
Plagiostomum caspium (Grim. ) in Hae ce fee 
Polycelis schulmanii (Grm.) ; : 
Hirvup1net. POLYCHzTA. 
Archeobdella esmontii (Grm.) Ampharete kowalewskii (Grim. ) 
* Fauna of the Caspian, by O. A. Grimm, 1876 and 1877. 
