Raymond : Gastropoda of the Chazy Formation. 221 



EXPLANATION OF PLATES. 

 Plate XLVI. 



1. Archinacella deformata (Hall). A specimen from Valcour Island, enlarged 

 four diameters. 



2. Side view of the same specimen, with same magnification. 



3. The same species. A specimen from Aylmer, Canada, to compare with figure 

 2. Enlarged two diameters. 



4. The same species. A specimen from Crown Point, N. Y., enlarged two 

 diameters. 



5. The same species. A specimen which is partially buried in matrix, four times 

 natural size. Valcour Island, New York. 



6. Another view of the same specimen. 



7. 8. Archinacella ? propria Raymond. Top and side views. Enlarged four 

 diameters. Chazy, New York. 



9, 10. Scenella montrealensis (Billings). Side and apical views of a specimen 

 from Chazy, New York. Four times natural size. 



11, 12, 13. Scenella pretensa Raymond. Three views of a specimen from Lenoirs, 

 Tennessee. Enlarged four diameters. 



Plate XLVI1. 



1. Scenella robusta Raymond. Top view of the typical specimen. Twice the 

 natural size. Valcour Island, New York. 



2, 3. The same species. Top and side views of a specimen from Lenoirs, Ten- 

 nessee. Twice natural size. 



4. Raphistoma striatum (Emmons). Side view, showing thickened inner lip. 

 Aylmer, Canada. Twice natural size. 



5. Another view of the same specimen, showing form of outer lip, and surface 

 markings. Twice natural size. 



6. Same specimen viewed from below, to show the form of the lip. Twice natural 

 size. 



7. 8. RapJiistoma striatum (Emmons). Top and bottom views of a cast of a 

 specimen from King's Bay, Cooperville, New York. Natural size. 



9, 10. The same species. Top and bottom views of a cast collected at Aylmer, 

 Canada, to be compared with figures 7 and 8. Natural size. 



11. Raphistoma stamineum Hall. Side view of the inner whorls of a specimen 

 from Chazy, New York, showing the flat striae of a small shell. Twice natural size. 



12. The same species. Top view of a specimen from Chazy, New York. Notice 

 the slender whorls, as compared with those of Raphistoma striatum. Natural size. 



13. The same species. A small specimen enlarged four diameters, to show the 

 way in which the striae are sometimes gathered into fascicles. Valcour Island, New 

 York. 



Plate XLVI II. 



1. Raphistoma stamineum Hall. View of the spire of a small specimen from 

 Valcour Island. Enlarged four diameters. 



2. The same species. Bottom view of a specimen from Chazy, New York, to show 

 absence of umbilicus in a testiferous specimen. Twice natural size. 



