PLATE 39. 



Fig. 1. 233. 10. MnacmsoNiA bellicincta. (Pag. 179.) 



1 a. A small imperfect specimen, preserving the stria and mesial band in a very perfect manner. 



1 b, A specimen with the striffi partially removed, showing the extension of the aperture below. 



1 c. A cast, showing the form of the aperture, which is nearly entire. 



1 d. A fragment of a larger specimen, preserving the striae and mesial band. 



1 e. Cast of a large specimen, the lower volution broken off. 



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Fig. 2. 234. 11, MuECHisoNiA suBFUsiFORMis. (Pag. 180.) 



2 a. View of the back of the spire ; the apex imperfect. 

 2 b. View, showing, imperfectly, the form of the aperture. 

 2 e. A large imperfect individual of this species. 



Fig. 3. 235. 12. MuKcmsomA vittata. (Pag. 181.) 



3 a. View of the back of the spire. 3 b. Partial front view, showing a part of the aperture. 



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Fig. 4. 236. 13. Mubchisonia oracilu. ^4^V~ (P^^?. 181.) 



4 a. Fragment showing six volutions. 

 4 b. Another fragment, showing one of the lower volutions partially covered by the shell. 



4 e. A small fragment, on which the shell is partially preserved. 



Fig. 6. 237. 1. SuBtruTBs ELONGATA. (Pag. 182.) 



3 a. Imperfect cast of a large specimen, showing a part of the aperture. 



5 &. A specimen preserving a portion of the shell, and showing the great length of the last volution and 



aperture. 

 h c. A fragment preserving the shell, and showing more distinctly the banded suture 



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