304 PROCEEDINGS OF THE ACADEMY OF [Sept., 



Explanation of Plates XVII-XIX. 



Plate XVII. — Figs. 1, 2. Conorbis mcnairyensis n. sp. 



1. Front view. x-1. 



2. Rear view. .x4. 



Figs. 3, 4. Hyllus coloratus n. gen. et sp. 



3. Front view. Nat. size. 



4. Rear view of another individual. Nat. size. 

 Figs. 5, 6. Hyllus callilaleris n. gen. et sp. 



5. Front view. Nat. size. 



6. Rear view. Nat. size. 



Fig. 7, 8. Astandes densatus n. gen. et sp. 



7. Front view. x3. 



8. Rear view. x3. 



Figs. 9, 10. Paramorea lirata n. gen. et sp. 



9. Front view. x4. 



10. Rear view. x4. 



Figs. 11, 12. Falsifusus mesozoicus n. sp. 



11. Front view. x3. 



12. Rear view. x3. 



Plate XVIII. — Figs. 1, 2. Scobina bicarinata n. gen. et sp. 



1. Rear view. x2. 



2. Front view. x2. 



Figs. 3, 4. Boltenella excellens n. gen. et sp. 



3. Front view. x2. 



4. Rear view. x2. 



Figs. 5, 6. Lirosoma cretacea n. sp. 



5. Front view. x2. 



6. Front view of a smaller individual. x2. 

 Fig. 7. Ecphora proquadricostata n. sp. 



Front view. x3. 

 Fig. 8. Aciisa microstriata n. sp. 



Front view. x2. 

 Fig. 9. Acirsa corrugala n. sp. 



Front view. x3. 

 Plate XIX. — Figs. 1, 2. Seminola solida n. gen. et sp. 



1. Front view. x3. 



2. Rear view. x3. 



Fig. 3. Hemiacirsa cretacea n. sp. 



Front view. x2. 

 Figs. 4,"5. Nudivagus simplicus n. gen. et sp. 



4. Front view. Nat. size. 



5. Front view of a larger individual. Nat. size. 

 Figs. 6, 7. Seminola crassa n. gen. et sp. 



6. Front view. xl|. 



7. Rear view. xl|. 



Fig. 8. Creonella triplicata n. gen. et sp. 

 Fi'ont view. x2. 



