14. 
15, 16. 
17, 18. 
19. 
20-22. 
23. 
24, 25. 
26, 27. 
364 
EXPLANATION OF PLATE XXXIITI. 
CANCELLARIA RUDIS Whitf. (p. 214). 
Opposite sides of the cast showing the features described. 
PLEUROTOMA SURCULTIFORMIS Whitf. (p. 215). 
. View of a specimen of the ordinary form. 
. View of a larger and more robust specimen. 
SURCULA PEROBESA Whitf. (p. 217). 
. Opposite sides of the best specimens observed. 
PLEUROTOMA REGULARICOSTATA Whitf. (p. 215). 
. Views of three casts referred to the species. The last, showing no plice on the last volu- 
tion, is from the collection Am. Mus, Nat. Hist., New York City. 
PLEUROTOMA (SURCULA) ALTISPIRA-Whitf. (p. 216). 
. Opposite sides of the same cast. Am. Mus, Nat. Hist., New York City. 
. View of a fragment showing the striw more strongly. 
. View of another specimen donbtfully of this species. 
SURCULITES ANNOSUS Conrad (p. 218). 
View of the back of the specimen upon which Mr. Conrad founded his species and genus. 
SURCULITES CADAVEROSUS Whitf. (p. 219). 
View of the opposite sides of a characteristic form of this species. 
SURCULITES CURTUS Whitf. (p. 220). 
Two views of an imperfect cast. 
View of the larger whorl of a specimen showing the difference in size of the next one 
above as compared with that of S. annosa. 
CYPR.EA SABULOVIRIDIS Whitf. (p. 223), 
Three views of the same cast, the latter view showing the aperture and its crenulations. 
CALYPTRAPHORUS VELATUS Conrad (p. 222). 
View of a cast showing the direction and cicatrix of the posterior canal. 
Two views of another cast showing some of the same features and the vertical folds on the 
apical volutions. 
Two views of a specimen from Claiborne, Alabania, for comparison. Collection Am. Mus. 
Nat. Hist., New York City. 
