Asaphus Kowalewskii  Lawrow 1856. This trilobite was found in the Vilpovitsy quarry, St. Petersburg region, Russia 

Dates to the Middle Ordovician Period. 

Size: Trilobite - 4.5 cm x 2.8 cm. Eyes - 1.1 cm;  
Matrix: 9.0 cm x 7.0 cm x 2.0 cm
  
The hard calcite exoskeleton shows up nicely against the lighter limestone matrix. 

Please note that these Russian trilobites always have a small amount of restoration, this trilobite has approximately 4% restoration.

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