PLATE XXVIII. 



LOXONEMA SIOULA. 

 Page 43. 

 Fig'. 1. A longitudinal section in chei-t,-of a specimen preserving thirteen volutions, enlarg^ed to two diameters. 

 Vig. 2. A fi-ag-mt'iil showing the last four volutions with a portion of the aperture, natural size. 

 Vig. 3. The lower volutions of another specimen, enlarged. 



LOXONEHA ROBUSTUU. 

 Page 40. 

 Kg. 4. A ca«t of the interior, incomplete at the apex. From the limestone ijf the Upper Helderberg. 



LoXONEHA SUBATTENUATUK. 

 Page 40. 

 Vig. 5. A cast of the interior, nearly entii'e, from the Schoharie gi-it, Schoharie, N. Y. 



LoXONEMA HaMILTONI.«. 

 Pago 45. 

 Fig. 6. A specimen in limestone pi-eserving thirteen volutions, the last one imperfect. 

 Pig. 7. A cast of the interior, in the Goniutite limestone of the Marcellus shale. 

 Fig. 7o. An enlai-gement of the strite on several of the volutions for comparison with other species. 



LoXONEMA HYDRAHLICUM. 

 Page U. 

 Fig. 8. An enlargonient of a fragment preserving thi-ee volutions, showing the constricted suture and char- 

 acter of the strise. 



LoXONEMA KECTISTRIATUM. 

 Page 130. 

 Fig. 9. A 8i)ecimen with the apex impei'fect, natural size. 

 Fig. 9a. An enlai-gement of the surface to show more distinctly the character and direction of the strisE. 



LoXONEMA L.«VID8CirLUM. 

 Page 131. 

 Fig. 10. A specimen of the ordinary form of the species. 



LoXONEMA L.«VIUSCULUM, Var. ? 



Fig. 11. An elongated, slender form, preserving about nine volutions, associated with the preceding, and 

 yrithuut any chai-acteristic markings of the surface. 



LoXONEMA BREVIOULUM. 

 Page 132. 

 Vig. 12. A longitudinal section of the specimen. 



LoXONEMA P08TREMUM. 

 Page 132. 

 Pig. 13. An internal cast which preserves marks of the strie upon the last volution. 



