PLATE XXVIII .—Continued. 
LoxONEMA MINUSCtJLA, 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. 
LOXONEMA DELPH1COLA. 
Page 47. 
Fig. 15. An imperfect specimen of unusually large size and rounded volutions, and preserving the charac¬ 
teristic sutural band. 
Peatyostoma turbinatum. 
Page 27. 
Fig. 16. A small specimen with rotund outer volution, having the surface marked by unusually strong and 
well defined striae. 
Holopea macrostoma. 
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 upper 
margin. 
Fig. 19. The lower side of an individual of medium size, showing an open umbilicus. 
Platyceras dtjmosttM var. rarispinttm. 
Page 16. 
Fig. 20. The dorsal side of a specimen, preserving the remains of four spines, the lower one being extremely 
elongate, and still incomplete at the apex. 
