EXPLANATION OF PLATE I. 



The following plate, drawn under my own direction, is intended to 

 present, as faithfully as possible, the characters of some of the more 

 rare and critical shells of the Canadian Pleistocene. 



Fig. 1. Aslarte Banksii A full-grown specimen of the ordinary 

 type. Riviere-du-Loup. 



Fig. 2. Astarte Laurentiana An average full-grown specimen. 

 Montreal. 



Fig. 3. Astarte lactea Ordinary type. Portland, Maine. 



Fig. 4. Astarte Elliptica A specimen with the ribs extending nearer 

 to the ventral margin than usual. Portland, Maine. 



Fig. 5. Buccinum tenue Full-grown specimen. Riviere-du-Loup. 

 5a Sculpture enlarged. 



Fig. 6. Buccinum cyaneum Full-grown specimen. Riviere-du-Loup. 

 6a Sculpture enlarged. 



Fig. 7. Buccinum undulatum (Var. of undatum) Immature shell, 

 broken at lip. Riviere-du-Loup. 7 a Sculpture enlarged. 



Fig. 8. Buccinum glaciate Tuberculated variety. Riviere-du-Loup. 

 Sa Sculpture enlarged. 



Fig. 9. Buccinum glaciate Smooth variety. Riviere-du-Loup. 9a 

 Sculpture enlarged. 



Fig. 10. Buccinum ciliatum (Fabricius,not Gould) Smooth variety, 

 somewhat decorticated. Montreal. 10a Sculpture enlarged. 



Fig. 11. Buccinum ciliatum (Fabricius, not Gould) Small but 

 mature specimen. Recent Murray Bay. 



Fig. 12. Buccinum Grcenlandicum Adult specimen. St. Nicholas. 

 12a Sculpture enlarged. 



Fig. 13. Choristes elegans (Carpenter) Adult specimen. Montreal. 

 13a Sculpture enlarged. 



Fig. 14. Capulus commodus Pt. Levis, Quebec. 



