1080 THE PALEONTOLOGY OF MINNESOTA. 



(.Meekospira subconlca. 



If all these species are indeed genetically related, then Meekospira certainly 

 deserves recognition as an independent and long-lived generic type. Of them all, 

 the oldest two (M. subconica and M. planilaieralis Fo3rste sp.) are the most like the 

 Carboniferous type of the genus. The others have more convex whorls. 



MEEKOSPIRA SUBCONICA, n. sp. 



PLATE LXXXI, FIGS. 40 and 41. 



Shell elongate subconical, apical angle about 33; bight about 27 mm.; greatest width of body whorl 

 12 mm.; whorls six or seven, very slightly convex, separated by shallow sutures; base of body whorl some- 

 what flattened; aperture subquadrate, its width less than the bight; outer lip straight and nearly vertical, 

 viewing it from the side; inner lip thin, passing out of sight a little above the middle of the aperture 

 Surface smooth in the only specimen seen. 



This is closely related to M. planilateralis Foerste sp., from the Clinton group in Ohio, but is larger, 

 has a wider apical angle and a more nearly quadrate aperture. 



Formation and locality. Richmond group, Spring Valley, Minnesota. 

 Collection. E. O. Ulrich. 



APPENDIX TO THE GASTROPODA. 



FIG. 10. Ouxnella antiquata Whitfleld sp., Upper Cambrian, Osceola Mills, Wisconsin, o, Dorsal 

 view of a small specimen retaining surface markings and showing that there is no slit-band, b and c, 

 Dorsal and lateral views of a larger specimen showing general form of shell and the umbilicus. The 

 figures are magnified two diameters, and the specimens belong to the U.S. National Museum. (This cut 

 should have appeared at the top of page 848.) 



l-'in. II. a, b, c, Euconospira planibasalis, n. sp. (Ulrich), Upper Carboniferous, Kansas City, Mis- 

 souri, d, e, Euconospira turbinifurniis Meek and Worthen sp., Coal Measures, La Salle, Illinois, a, Side 

 view of an entire specimen of E. planibasalis, x2, showing general form of shell, the flat base, surface 



