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. Astarte 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 /ac^ea— Ordinary type. Portland, Maine. 



Fig. 4. Astarte Elliptica—K 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 ujidulatum — (Var. of undatum) — Immature shell, 

 broken at lip. Rivi^re-du-Loup. 7a— Sculpture enlarged. 



Fig. 8. Buccinum glaciale — Tuberculated variety. Riviere-du-Loup. 

 8a — Sculpture enlarged. 



Fig. 9. Buccinum glaciale — 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 e^ej/aws— (Carpenter)— Adult specimen. Montreal. 

 13a — Sculpture enlarged. 



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



