Fies. 1,2. 
3. 
342 
EXPLANATION OF PLATE XXII. 
CaVOSCALA ANNULATA Mort. sp. (p. 177). 
Views of the opposite sides of a large specimen showing the general features. 
Basal view of the same specimen showing the character of the umbilical cavity and the 
flattened callosity around it. Acad. Nat. Sci., Phila. 
. Eniargement of four of the ribs from the body volution. 
. A further enlargement of one rib to show the finer vertical striz. 
PLEUROTOMARIA TINTONENSIS Whitf. (p. 178). 
. Vertical, basal, front and lateral views of the specimen described, which I am inclined to 
think is a European specimen. Collection at Columbia College. 
PLEUROTREMA SOLARIFORMIS Whitf. (p. 180). 
. Vertical and basal views of a large individual from the collection of the Am. Mus. Nat. 
Hist., New York City. 
. Lateral and basal views of one from the collection of Acad. Nat, Sci., Phila. Fig. 12 
showing the casts of openings along the line of the slit. 
. View of a third specimen of the species. 
