My note Tuesday Aug, 11-91. Looked over the collection of Dr. Ruttine. One clamus he showed us which appeared to be distinct from any seen before by me. He also presented me with a specimen of Strongycephalus Ruttini' which appears to have been found in the drift. Also a specimen of Szygosia bovalis? probably from the Dakota limestone. 9.30 Started for Spring Valley. About four miles west of by [illegible] a cut occurs in the rail-road containing the upper beds of the Cincinnotati' order. About one mile further south meet another cut occurs at a somewhat lower level in this formation. The large Strophomena alternata like our L. corbyti' is common in this cut.