PLATE XIII.— Continued. 
Loxonema Hamiltoni^. 
Page 45. 
Fig. 15. A specimen of the usual size, showing the characteristic features 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 typical specimen of the species. Dublin, Ohio. 
Fig. 18. A larger individual, showing the .aperture in part; From the same locality as the preceding. 
Loxonema eelphicola. 
Page 47. 
Figs. 19, 20. Two small specimens, showing considerable variation in the apicial angle, but both having the 
sutural band. From the Hamilton group; the first 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. ' From near Geneva, N. Y. 
Fig. 25. A similarly coated specimen, 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. 
