222 



REPORT 1856. 



Page. 



6 



Plate. 



Fig. 



Name. 



Locality. 



264 



56 



24 



8-11 



Lyonsia Norvegica, Chemn , 



Schant., S. Ochotsk, Tugur. 











= L. striata, Turt. (Mya str., Mont.) 











= L. gibbosa, Hanc. 













= Mya Jiyalina, Conr. teste Couth. 













= Pandorina arenosa, Moll. 













= Amphidesma corbuloides, Lara. 













= Osteodesma corbuloides, Desh. 













= 0. hyalina, Couth., Gld., De Kay. 





266 



57 



25 



11-14 



Mya truncata, Linn 



S. Ochotsk. 



-\-M. Uddevalensis, Hanc. 



268 

 269 



58 

 59 







arenaria, Linn 



S. Ochotsk. 



S. Ochotsk, Tugur. 



S. Ochotsk (Lebashja). 



Panopaea Norvegica, Spengler 



269 



60 







Machaera costata, Say 











= Solecurtus Nuttallii, Conr. 











= Solen nitidus, Chen. 













= S. splendens, Chen. 













= S. Americanus, Chen. 













= S. medius, Gray, Z. B. V. p. 153. 













pi. 44. f. 2. 













= S. maximus, Wood (nee Chemn.) 













p. 129.pl. 31. f. 3. 













}=S. tenuis, Brod. & Sow. 













? = £. alius, Brod. & Sow. 





The freshwater and land shells described in this work, pp. 273-308, appear 

 to belong exclusively, either to the general North temperate fauna of the old 

 world, or to the local fauna of the district. They are distributed by Mid- 

 dendorff under three heads, pp. 389 et seq. (1) Circumpolar Fauna : LJnio 

 margaritifera, Pianorbis albus, Limnaeus stagnalis and palustris, Physa hyp- 

 norum, Succinea putris, Helix pulchella, pura and fulva, Achatina lubrica, 

 Vitrina pellucida. (2) Boreal Fauna: Unio pictorum and batavus, Anodonta 

 cellensis and anatina, Pisidium obliquum, Cyclas cornea and calyculata, 

 Pianorbis corneus, complanatus, contortus, leucostoma and vortex, Limnaeus 

 auricularius, truncatulus, leucostomus, Physa fontinalis, Paludina Kikxii and 

 tentaculata, Valvata piscinalis, Helix ruderata, Schrenkii, carthusiana and 

 hispida, and Bulimus obscurus. (3) Central Asiatic Fauna: Unio Dahuricus 

 and Mongolicus, Anodonta herculea, and Limnaeus Gebleri. 



The author enters at considerable length, pp. 351-389, into the influence 

 of Zones, Depths, Temperature and Saltness on the distribution and changes 

 of mollusks ; and gives full details of the peculiarities of several specific and 

 generic forms, pp. 330-342. In pp. 309-463, the author distributes the 

 Russian shells into their various Zoological provinces. With the Aral-Kas- 

 pian, the Black Sea* and the very limited Baltic faunas, we have now no 

 concern. The Polar fauna (p. 318 et seq.) is divided into three sections: — 

 A. The Atlantic species, 30 in number. B. Those of the Behring Sea, 26 ; 

 and C. the Circumpolar species, 54. To this list are added 50 species, which 

 have not yet been found in the Russian dominions. 



* MiddendorfT gives the following species as common to the temperate latitudes on both sides 

 of the Atlantic: — Littorina nulls, Fusus nuiricatits, Crcpirfula ungutformis, Dentaliumcientalis, 

 Anomia ephippium, Solen ensis, Pecten rurius, Lima squamosa. Also the following as common 

 to the Mediterranean and the West Indies: — Conns Mcditerrancus, Columbella niTcatoria, 

 Nassa crenulata, Littorina muricata and neritoides, Ceritliium lima, Tcllina carnariu, and 

 Jlotella lineata. Pp. 340—7. 



