PALEONTOLOGY. 

 PLATE XII. 



Page. 

 AlHHiUliAIS ((iOinuCUEIl^) CABT«»KKN8IH Wllitf 427 



Flii. 1. Euliirp-d view of u siM-ciiiifii, hliowiujj the extent of the jtosteiior caual aloiij; the 

 H|>ire. The expiuuiou of the lip in seeu u little more extreme on one other indi- 

 viilunl. 



ANfllfHA (I)HKI'AXOtllHn.f8) NEBRASCEXSIK K. &. S 429 



Flu. W. \ lew i(f a Huiali jn<livi<liial, the labial sjiiue Htrougly directed backward. 

 Fi<i. 3. A larner individual, varjinj; Komewlial in the form of the labial jirojection. 



Al'oKUIIAIS VKWIIKltUVI Meek 425 



Fui. 4. \iew of a Hpeeiuien imperfect at the anterior end, but showinj? the labial spines for 

 some extent, though broken, aiul the posterior caual extending beyond the top 

 of the spire. 



AruitKiiAis .MK.KKi Whitf 426 



Fici. r>. View of the imperfect specimen, which, however, shows the characters of the 

 species. 



ANCiiritA 1 siiiLKVis M. «.V II 428 



Fl(J. (>. Knlarj^ed view, showinj; the features of the species jjjenerally observed and the 

 stronj.;fr varices on the rij;ht side of the second and third volutions. 



FO8U8 SIIIJMARDI II. <& M 424 



Fig. 7. View of an imperfect individual, preserving the stria; in part. 

 Fig. 8. Enlargement of the surface. 



FUSUS CHEVENXEXSIS Wllitf 424 



Fig. y. View of the specimen described, which is an internal cast. 



Fasciolaria (Cuytorhytis) contorta Meek's sp 422 



Fifi. 10. View of an imperfect individual, i)reserving the two lower volutions, and showing 

 their form and surface charactei-s. 



Fasciolaria (Piestocheilus) culbertsoxi M. »fc H 423 



Fk;. 11. View of a specimen, ])reserving the two lower volutions, showing the surface char- 

 acters and form of the aperture. 



Fasciolaria (Crytorhytis) fusiformis H. & M 421 



Fui. 1"J. View of a fragment from the eollectiim of Dr. Newberry, showing the lower volu- 

 tions with their characteristic markings. 



Lr.vATiA coxcixxa 11. A: M — 430 



Fig. 13. View of a specimen of the species, showing the form of shell and aperture. 



Vanikoka AMiuui a M. a 11 . 430 



Fi<;. 11. View of a specimen, enlarged, showing the character of surface and form of shell. 



MAU(iAi:n A MinitACEXSLs M. & H 432 



Fu;. 1.'). Enlarged view of a s]>ecimen, showing the general features of the species. 



AMAVRiirsis rAi.ri>ix.i:i oiiMis 11. & M 431 



Fk;. 111. \'iew of the l)a<'lv of a specimen, natural size. 



A.MIS().MYOX PATKLLIl OUMI.S .M. vV II 435 



FiCi. 17. Vertical view of an internal cast of this species, showing the muscular impression. 

 I'll.. 1'. I'rolile view of the same, showing the elevation of the heak and its anterior i)osi- 

 lion. 



AXI.Sl>M Yl IX SUBOVATUS M. & H 434 



Fig. 11'. View of a cast, showing the form of the shell and muscular imprint. 



AXISOMV<»X ALVEOMS .M. & 11 433 



Fig. 20. Vertical view of a partially exfoliated specimen, showing the muscular imprint 

 in part. 



Axis<>MY»>x BOREALisMort 436 



Fi<i. 21. Vertical view of a 8i»ecimen preserving a part of the shell. 

 Fig. '2i. Pmlile view of an iini>erfect specimen, retaining the shell. 

 Fig. 23. View of a fragnn-nt, showing the radiating lines. 



IIamim:a m ni vi.inhrka M. A II 437 



Fig. •-'•1. Enlarged view of a specimen, showing the surface features and form of aperture. 



Akera glaxs-oryza Whitf 437 



Fig. 2.'). View of a specimen, greatly eularged, showing its form and characters. 



Dext.u,u:m GK.VCII.U II. <& M 438 



Fig. 26. View of au imperfect specimen, preserving the features of the species. 



