628 THE PALEONTOLOGY OF MINNESOTA. 
(Errata. 
Lrrata for the Chapter on Lamellibranchiata. 
PAGE, 
477, 6th line from bottom, for Chenodomus read Cymatonota. 
479, 3d line from bottom, for Clidoporus read Clidophorus. 
479, 10th line from bottom, for usually read unusually. 
479, 12th line from bottom, the variety referred to is described in vol. vii, Geol. Sur. Ohio, p. 629, as 
Byssonychia vera Ulrich. 
482. Supply omitted letters S-B to ends of bottom line of cut. 
485, 14th line from bottom, for Hetenoptera, Ulrich read Opisthoptera, Meek. 
486. The family LyRopDESMID& should be restricted to the typical genus, and Allodesma, Ulrich, referred 
to the family CyYCLOCONCHID (next page) while Technophorus, Miller, and Ischyrina, Billings, 
should follow as a distinct family, TecHNOPHORID a. (See p. 608.) 
504, 17th line from bottom, refer AL. truncata Hall, to Modiolodon instead of Eurymya. 
512, 9th to 14th line from bottom, dele remarks on Modiolopsis truncata Hall. 
513, 5th line from bottom, for ACTINOMYA read WHITEAVESIA. It was learned too late to make 
the corrections in their proper places that the name Actinomya had been preoccupied by 
Mayer for a Cretaceous or Tertiary genus of shells. A new name is therefore necessary for 
the Silurian genus, and it gives me much pleasure to propose Whiteavesia, after Prot. J. F. 
Whiteaves, the successful paleontologist to the Geological Survey of Canada. The reader 
will please substitute the new name for the other in the following places: Page 485, 4th line 
from bottom; p. 501, 12th line from top; p. 504, 14th line from bottom; p. 505, several instances 
in second and third paragraphs; p. 506, 1st line from top; p. 518, 5th line from bottom; p. 514, 
several instances in third and fourth paragraphs; p. 515, Ist and 6th lines from top, and 4th 
and 5th lines from bottom; p. 516, 5th and 7th lines from top; p. 517, 7th and 17th lines 
from top; p. 518, 16th line from top; p. 524, 8th and 10th lines from bottom; and p. 531, 5th 
line from top. 
520, Ist line from top, after ORTHODESMA CANALICULATUM add n. sp. 
563, 19th line from top, for 5100 read 8626. 
592, 19th line from bottom, for CrENDONTA read CTENODONTA. 
593, 9th line from bottom, for C. leveta read C. levata. 
