PLATE XITI. 



LOXONEMA StJBATTENUATA. 

 Piigu 40. 

 'P\g, 1, An inteninl cast, eonsistiiifr of three volutions, but showiny no traces of Bui-face charactere. 

 Vig. S. A ciniilar sjiecnnen, (•(insisting of tive volutions. 

 Fig. 3. A similar but larger individual, retaining about five and a, half volutions and somewhat compi-essed. 



LoXONEMA ROBUSTA. 



I'agc 40. 



Fig. 4. One of the specimens used in the original description. The opposite side (not figui-ed) shows the 

 characteri.stio niiirkings of tlw genus Loxonenia faintly traceabh; on the two lower volutions : 

 those on the larger volution Are sti-ong, three of them occupying the space of moi-e than an 

 eighth of an inch.  ' ■^'- .''.""<-•' (.n.,.:.,.i-.« ,.{t,.,-i>4 i:>ti 



Fig. 5. A larger individual, showing the form, but somewhat compressed. Schoharie, N. Y. 



Fig. 6. An imperfect internal cast of this species. Clai'en(* Hollow, N. T. 



LoXONEMA? COAPTA. 



Page 44. 



Kg. 7. An imperfect specimen, in limestone of the Hamilton shales, at Eighteen-Mile creek, Lake Erie shore. 



LoXONEMA SOLIDA. 

 Page 41. 

 Figs. 8, 9. The typical specimens from which the original description was drawn. They ai-e internal casts, 

 and show no evidence of surface-raarkiags. 



LoXONEMA ? TERES. 

 Page 42. 

 Fig. 10. A cast of the species in limestone, with no detined surface-markings ; but the form of the volutions, 

 and the absence of any indication of a i-evolving band, show its relations with Loxonema. 



Loxonema pexata. 



Page 42. 

 Figs. 11, 12. Internal caiits of two specimens, which show no extenial markings ; probably of this species. 

 Stafford, Genesee county, N. Y. 



Loxonema pexata var. obsoleta. 



Page 4a. 

 Fig. 18. The lower volutions, showing the form and the surface-markings, which are more arcuate than 

 represented in the drawing. 



Loxoneaia hydraulica. 



Page 44. 

 Fig. 14. The typical specimen. 



