PLATE 24. 



T&ge 



Fig. 1 a - k. Orthis varica. 179 



1 a - i. Figures showing tlie gradation of size, form, etc. 



1 k. Knlargcmcnt of the radiating strise. 



Fig. 2 a - y. Cvrtia d.^lmani. 206 



2 a - y. Illustrations of tlie ventral, dorsal, proflle, and cardinal views of this species, re- 



presenting the principal varieties of form and size. 



Fig. 3a-/. Trematospira jiultistriata. 209 



!! a - t. Illustrations showing gradations of size, variety of form, etc. 



3 y. Enlargement of the strife. 



