PLATE 19. 



Pago, 

 Fig. 1. Odontobasis ventricosa 354 



1, a. A dorsal view, natural size, of the type-specimen. 



I, b. An opposite view. [Aperture more correctly represented in the enlarged wood-out given 



in the text.] 

 l,c. Magnified, surface-markings, of same species. 



Fig. 2. Fasciolaria? (Cryptorhitis) elexicostata 367 



An imperfect specimen, dorsal view. [See cut in text.] 

 Fig. 3. Anchura? subl^vis 32? 



3, a. A specimen, with the lip broken away (type). 



3, b. An opposite view of the same. 



Fig. 4. Anchura ? parva 328 



An imperfect specimen, magnified three diameters (type). 

 Fig. 5. Anchura (Drepanochilu.s) Nebrascensis 326 



5, a. A perfect specimeu, magnified about two diameters. 



5, J. Line, showing the length, natural size. 



5, c. Magnified surface-markings. 



Fig. 6. Aporrhais biangulata .....: 322 



6,0. Shell, natural size, with the upper part of the lip broken away (type). 



6, b. Same, magnified. [See also cut in text.] 



6, c Stripe, on a part of expanded lip, magnified. 



Fig. 7. Trachytriton vinculum 304 



7, a. A complete specimen of medium size. 



7, b. An aperture view of a larger specimen, with the apex of the spire and the end of the beak 



broken away. 

 7,c. Surface-markings, magnified. 

 7,d. One of the little revolving-bauds, still more highly magnified. 



Figs. 8 and 9, a, b. Margarita Nebrascensis 298 



l*,a. An aperture view of the specimen, showing a tendency to angularity of the body-volu- 

 tion. 



8, b. An opposite view of same. 



9, «. The type-specimen, showing the usual rounded character of the volutions. 



9, b. A largo specimen, from a different locality (natural size). 



Figs. 10 and 9, e. Closteriscus tenuilineatus 308 



10, a. A specimen, with the apex of the spire and beak broken away. [Type of the genus.] 

 10, l>. An opposite view of same. [The white belt along the columella is not the inner lip, but 



a part of the rock filling the aperture.] 

 9, 1: This figure (over 10, 6), showing magnified surface-markings of this species, was inadvert- 

 ently uumbered 9, c, instead of 10, c, on the plate. 



Fiu. 11. Margariteixa m.kximriata 302 



ll,o. Under side of an internal east, showing umbilicus, magnified two diameters (type of the 



genus). 

 11./'. A side view of same, showing the depressed form and sharp periphery. 



II, c. An upper-side view of same. 



Mi/. Surface-markings of upper Bide of volutions. 



Fig. 1'.'. Vanikwro ambigua 330 



12, a, An aperture view of the nearly perfect type specimen. 



1'-', '». An opposite view of same. 



12, c. A somewhal largei specimen ol same species. 



I-'.*/. Magnified surface markings. 





