. The Geology of Minnesota . 559 36. The interior of an imperfect right valve. 37. External view of a left valve, imperfect in the postero-dorsal region. 38. Outline cardinal view of the original of fig. 36. Upper part of middle third of the Trenton Falls, Minnesota. Figs. 39 to 44. Vanuxemia abkupta, n. sp 560 39 to 41. Anterior, lateral and dorsal views of a nearly perfect cast of a right^valve. Thisspecimen is of the average size and Cast of a large left valve that has suffered slightly from pressure, causing slightdifferences in the outline and the a
. The Geology of Minnesota . 559 36. The interior of an imperfect right valve. 37. External view of a left valve, imperfect in the postero-dorsal region. 38. Outline cardinal view of the original of fig. 36. Upper part of middle third of the Trenton Falls, Minnesota. Figs. 39 to 44. Vanuxemia abkupta, n. sp 560 39 to 41. Anterior, lateral and dorsal views of a nearly perfect cast of a right^valve. Thisspecimen is of the average size and Cast of a large left valve that has suffered slightly from pressure, causing slightdifferences in the outline and the anterior side to be less abrupt than and 44. Side and dorsal views of a smaller cast of a right valve in which the anterior endis very obtuse. Middle Galena, Fillmore county, Minnesota. Fig. 45. Vanuxemia sakdesoni Ulrich 555 (See also plate xxxvii, figs. 17—19.) Interior of the left valve as brought out in a gutta-percha impression of theoriginal type of the species, Vol. III. j Lamellitranchiata j plate XXXVII! 1. PLATE XXXIX. Page. Figs. 1 to 5. Vanuxbmia decipiens, n. sp 562 1 to 3. Lateral, dorsal and anterior views of the largest cast of the interior and 5. Side and dorsal views of a smaller cast of a right valve. Geol. Sur. Mas., 8626. Figs. 6 and 7. Vanuxbmia worthbni Ulrich 561 The left side and an anterior vievyof a nearly perfect cast of the interior. UpperGalena, Jo Daviess county, Illinois. Figs. 8 to 12. Cyrtodonta OBESA, n. sp 542 8 to 10. Three views of a typical shell of this species. Black River limestone, Mercer county, and 12. A small specimen of the natural size and x 2, referred to this species with somedoubt. Middle third of the Trenton shales, St. Paul, Minnesota. Figs. 13 to 15. Ctenodonta GiBBERA, n. sp 542 Three views of the specimen described. It is a cast of the interior. Base of themiddle Galena, Goodhue county, Minnesota. Mus. Geol. Sur. Reg. No. 8366. Figs. 16 to 19. Cyrtodonta rotulata, n. sp 541 16 and 17.
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