I am trying to figure out the ID of  some "Umbonium moniliferum" specimens from NE Russia....(vs. U. costatum). 

My one reference (Alexeyev, Gastropod Seashells of Russia, 2003, page 38) only illustrates/features U. moniliferum, however in the Russian text portion there appears to be a comment related to/ending in  ".......Umbonium costatum (Kiener, 1834)". 

Unfortunately this comment wasn't included in the accompanying abridged  portion of the English text, if anybody can tell me what it says that would be great. 

Thanks

Steve

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