State Microscopical Society of Illinois · Chicago, Ill. : State Microscopical Society of Illinois · leaf 49
ndefault of any previous name, I propose to - call my specimenOligoporus Groveri, from a dear pupil of mine, recently deceased,near whose residence in Hancock County, Illinois, the fossil wasobtained. I subjoin the following imperfect description: Oligoporus Gro-veri. Form, sub-spheroidal;… … 1872.] The DiatomacecB of Lake Michigan. 41 towards the extremities, the outer row on each side next the am- bulacral areas being composed of plates from two to four times as large as the plates in the remaining rows. Ambulacral areas with four rows of plates, pierced with eight rows of pores,…
Microscopy
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