English: Drawing of dorsal view and lateral view of Helcionopsis striata. Head region is on the left.
Date
Source
Ulrich E. O. & Scofield W. H. 1897. The Lower Silurian Gastropoda of Minnesota. In: Ulrich E. O., Scofield W. H., Clarke J. M. & Winchell N. H. The Geological and Natural History Survey of Minnesota, volume 3(2), Harrison and Smith, Minneapolis, 48 plates. Pages 813-1081, plates 61-82. Helcionopsis striata is on the page 827, plate VXI, figure 29-30.</ref>
Author
Edward Oscar Ulrich (1857 – 1944) & Wilbur H. Scofield
Public domainPublic domainfalsefalse
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{{Information |Description={{en|Drawing of dorsal view and lateral view of ''Helcionopsis striata''. Head region is on the left.}} |Source=Ulrich E. O. & Scofield W. H. 1897. ''The Lower Silurian Gastropoda o