Raymond : Gastropoda of the Chazy Formation. 223 



17. The same species. Side view of a specimen from Isle La Motte, Vermont. 

 Natural size. 



For specimens of this species showing surface markings, see plate LV. 



Plate L. 



1. Maclurites magnus Lesueur. The outer view of a partially exfoliated oper- 

 culum. Crown Point, New York. Natural size. 



2. The same species. Cast of a specimen from Lenoirs, Tennessee. Natural 

 size. 



3. Bucania sulcatina (Emmons). Side view of a partially exfoliated specimen, 

 showing the lines of growth only. Natural size. 



4. The same species. Aperture of another specimen from Crown Point, New 

 York. Natural size. 



5. Tetranota bidorsata? (Hall). Internal cast of a small specimen from Valcour 

 Island, New York. Twice natural size. 



6. Trigyra ulrichi Raymond. A testiferous specimen from Isle La Motte, 

 Vermont. The very minute pits on the surface could not be brought out by this 

 process. Twice natural size. 



7. Operculum of an unknown gastropod. Valcour Island, New York. Natural 

 size. 



Plate LI. 



I, 2. Maclurites magnus Lesueur. Top and bottom views of a specimen from 

 Valcour Island, New York. Natural size. 



Plate LII. 

 I, 2, 3. Maclurites magnus Lesueur. Outer, inner, and side views of the oper- 

 culum. Natural size. Valcour Island, New York. 

 4. The same species. Side view of the specimen figured on the previous plate. 



Plate LII I. 



I, 2. Eccyliomphalus fredericus Raymond. Two views of a specimen from Crown 

 Point, New York. Twice natural size. 



3. The same species. A somewhat distorted specimen from Crown Point, New 

 York. Twice natural size. 



4. Eccyliomphalus kalmi Raymond. Upper side of a specimen from Valcour 

 Island, New York. Enlarged four diameters. 



5. Eccyliomphalus proclivis Raymond. Lower side of a specimen from Crown 

 Point, New York. Twice natural size. 



6. Eccyliomphalus sp. ind. Enlarged four diameters. Valcour Island, New 

 York. 



7. 8. Trochonema dispar Raymond. Bottom and side views of a specimen lack- 

 ing the spire. Twice natural size. Valcour Island, New York. 



9, 10. Trochonema biangulatum (Hall). Side and top views of a specimen from 

 Valcour Island, New York. Twice natural size. 



II, 12. Trochonettia rectangulare Raymond. Two views of a specimen from 

 Valcour Island, New York. Twice natural size. 



13. Holopea harpa (Hudson). Four times natural size. Valcour Island, New 

 York. (After Hudson. ) 



