PLATE XXX. 



Pleueotomaria adjctoh. 



Page 80. 

 Fi^. 1. A figure of the peripheral band, and the strite above and below, enlarged three diametera. 



Plecbotomaria Itys. 



Page 76. 

 Fig. 2. A figure of the peripheral band, and the stria; above and below, enlarged three diameters. 



Pleueotomaria insolita. 



Pago 81. 

 Fig. 3. The mesial band and adjacent strite, enlarged five diameterti. 



Pleueotomaria nitella. 



Page 85. 

 Rg. 4. An enlanjement of the mesial band, showing the bicarination on each side, with the simple sharp 

 strise ; four diameters. 



Pleueotomaeia Itys var. tenuispira. 



Page 87. 

 Fig. 5. The peripheral baud, with the adjacent 8tri«, enlarged four diameters. 



Pleueotomaeia capillaria, var. 



^ Pago 87. 



Fig. 6. An enlargement of the peripheral band, showinir a single revolving line and more distant stria; than 



the typical forms of the species. See figures 20 and 21. 



Pleueotomaria capillaria. 



See page 87. 

 Fig. 7. An enlargement from the oi-dinary form of this species, showing a striate peripheral band, and 

 closely an-anged striiE above and below. 



Pleurotomaeia SULCOMAEGINATA. 



Pago l». 

 Rg. 8. An enlargement showing a plain iieripheral band with the striae carinated above and below ; two 



diametei-s. 

 Fig. 9. A similar enlargement from another specimen, showing a striated peripheral band, with the stri« 



uninterrupted above and marked by a very faint carination below ; three diameters. 



Pleueotomaria Lucina. 



Pago R7. 



Fig. 10. The surface of a specimen from the Hamilton group, showing the character of the striae on the two 

 outer volutions — the peripheral band on the last one 1)eing marked by fine transverse strife, 

 while the one pi-eceding it baa both transveree and revolving strise ; natural size. 



Fig. 11. The surface of a specimen fi-om the Upper Helderberg limestone, showing the character of the 

 peripheral band, with the strongly cancellated striae above and below ; enlarged two diametei-s. 



Pleurotomaeia quadeilix. 



Page m. 

 Fig. 12. An enlai-gement of the periphei"al band and surface stri»; two iliametei-s. 



Pleueotomaeia teilix. 



Page "9. 

 Fig. 13. An enlargement of the peripheral band and adjacent striae, giving the characteristics of the surface ; 

 three diametei-s. 



Teochus (Fal^otrociius) Kearneyi. 



I'ugc 133. 



Fig. 14. The dorsal side of a specimen which preserves the striffi upon the last volution ; the upper volutions 

 being denuded of the shell, and the apex incomplete. 



