PLATE XlU.—Cmtimed. 



LOXONEMA HaMILTONI^. 



Page 45. 

 Fig. 15. A specimen of the usual size, showing the charactei-istic featui-es of the species. 

 Fig. 17. An individual of similar character, scarcely differing in size, and preserving one volution less than 

 the preceding. 



LoXONEMA PEXATA. 



Page 42. 

 Fig. 16. A tj-pical specimen of the species. Dublin. Ohio. 

 Fig. 18. A larger individual, showing the apertni-e in part. From the same locality as the preceding. 



LoXONEMA DELPHICOLA. 



Page 47. 

 Figs. 19, 20. Two small sjieciniens, showing considerable variation in the apicial angle, but both having the 



Butaral band. From the Hamilton gi-oup ; the firet specimen from Cayuga, the other from 



Seneca Lake, N. Y. 

 Fig. 21. A specimen, showing very coarse markings and a well-defined sutural band. From the soft shales 



of the Hamilton group, Cayuga Lake, N. Y. 

 Figs. 22, 23. Two views of a specimen, with finer surface-markings and a very distinct sutural band. From 



the harder layers of the Hamilton group, Delhi, N. Y. 

 Fig. 24. A specimen enclosed in a coating of smoothed and polished shale (slickensides) — a very common 



condition of the species in the soft shales. Fi-om near Geneva, N. Y. 

 Fig. 25. A similarly coated s[>ecimen, from Cayuga Lake, N. Y. These specimens indicate the commence- 

 ment of the accretion of soft material about the shell, which, in its final condition, envelops the 



fossil in a more or less distinctly formed concretion. 



