PLATE XXYIII.— Continued. 



LOXONEMA MINUSCULA, n. Sp. 

 Fig. 14. A specimen preserving seven volutions, and apparently entire at the base. This form is common 

 in the limestone of the Marcellus shale at Cherry Valley, but the surface-markings are not 

 preserved. .. :ii;i/ r 



LoXONEMA DELPHICOLA. 

 Pago 47. 

 Fig. 15. An imperfect specimen of unusually lai-ge size and rounded volutions, and preserving the charac- 

 teristic sutural band. 



Plattostoma TURBINATUM. 

 Page 27. 

 Fig. 16. A small specimen with i-otand outer volution, having the surface marked by unusually strong and 

 well defined strise. 



HOLOPEA MA0R08T0MA. 

 Page 33. 

 Fig. 17. A specimen of unusually large size, partially preserving the shell. 



Callonema bellatulum. 



Page 51. 

 Fig. 18. A young specimen (fig. 10 of plate 14) greatly enlarged, to show the angular character of the outer 



volution both above and below, while the higher'Volutions are angulated upon their ujiper 



margin. 

 Fig. 19. The lower side of an individual of medium size, showing an open umbilicus. 



Platyceras dcmosttm var. barispinum. 



Page le. 

 Fig. 20. The doi-sal side of a 8i)ecimen, preserving the remains of four spines, the lower one being extremely 

 elongate, and still incomplete at the apex. 



