Geology of the St. Croix Dalles. — Berkey. 293 
Plvte XIX. 
Figures all natural size. 
Figs. 1-2. Hypscloconus {Metoptoiiia] recurvits (Whitf.), \?l\ . clon^^a- 
tus, (elexation and aperture). P. 284. 
Figs. 3-8. Hypscloconus reciirviis (Whitf.) P. 284. 
Figs. g-io. Hypscloconus cylindricus, n. sp. P. 285. 
Figs. 1 1- 1 2. Hypscloconus cornutifonnis, n. sp. P. 285. 
Figs. 13-16. Hypscloconus recurviis (Whitf.) P. 284. 
Figs. 17-18. Hypscloconus franconicnsis, n. sp. P. 285. 
Figs. iQ-20. Hypscloconus capuloides, n. ^i. P. 285. 
Figs. 21-24. Hypscloconus recurvus (Whitf.) P. 284. 
Figs. 25-26. Hypscloconus stahilis, n. sp. P. 286. 
Figs. 27-30. Hypscloconus recicr^nis (Whitf.) P. 284. 
Fig. 31. Outline of aperture of the largest fragment restored. 
In each case the figure representing the elevation of a specimen is 
followed by a figure representing the outline of the aperture of the same 
individual. 
Plate XX. 
Figures all natural size. 
Fig. I. Agraulus {Arioncllus) coni'cxus Whitf., (senile indixidual). 
P. 288. 
Fig. 2. Side view of the same specimen showing diagrammatic out- 
line. P. 288. 
Fig. 3. Ptychoparia (Conoccphalitcs) caly/ncnoi(lcs^\\\\'a.it\d,. P. 289. 
Fig. 4. Side view of same specimen. 
Figs. 5 and 6. Agraulus convcxus Whitfield, (small sp^^cimen). P. 
288.- 
Figs. 7 and 8. Chciloccphalus si. croixcnsis, n. sp. P. 2qo. 
Fig. q. Agraulus com'cxus Whitfield, (mature stage). P. 288. 
Fig. 10. Side view of A. convexus, (diagram of head). P. 288. 
Fig. II. Pygidiumof^. cottvexus \)rohah\y. P. 288. 
Figs. 12 and 13. . Dicellocephalus misa Hall. P, 290. 
Figs. 14 and 15. Agraulus hemisphericits, n. ?.\^. P. 289. 
Figs. 16 and 17. Tryblidium extcnsuni, n. sp., (elevation and aper- 
ture). P. 281. 
Figs. 18 and 19. Tryblidium {Mctoptonia) barabucnsis (Whitf.) P. 
281. 
Fig. 20. Fragment of a partiallv coiled form of unknown jiosition. 
P. 287. 
Figs. 21 and 22. Tryblidium corpulenlum, n. sp. P. 281. 
Fig. 23. Euomphalus strongi Whitf., var. sinislrorsus. P. 287. 
Figs. 24 and 25. Tryblidium convexiwi, n. sj). P. 280. 
Fig. 26. Scavogyra fninnesotensis, n. sp. P. 286. 
Figs. 27 and 28. Tryblidium aduncum, n. sp. P. 282. 
Figs. 29 and 30. Tryblidium rcctilatcralc, n. s|). P. 280. 
