P^XPLANATIOX OF PLATE I. 



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

 present, as faithfully as possil.le, the ciuiracters of some of the more 

 rare and critical shells of tlie Canadian Pleistocene, 



Fig. 1. Aslartc JJtod-.sii—A full-grown specimen of tlie ordinary 

 type. Rivii-re-du-Loup. 



Fig. 2. Astarte Laitreii/imia — An average full-grown specimen. 

 Montreal. 



Fig. 3. Asfarte /«r/«t— Ordinary type. Portland, Maine. 

 Fig. 4. Antarte Elliplica—A specimen witii the ribs extending nearer 

 to the ventral margin than usual. Portland, Maine. 



Fig. "). Bitcriiium ^WHr;— Full-grown specimen. Rivicre-du-Loiip. 

 ~)a — Sculpture enlarged. 



Fig. 0. Bncfinum r7/a«fc»??i— Full-grown specimen. Rivicre-du-Loup. 

 6a — Sculpture enlarged. 



Fig. 7. 'incriiiinn ii)idiilai,im~(ya,y. of ?(«</«^»wi)— Immature shell, 

 broken at lip. Riviere-du-Lonp. 7«— Sculpture enlarged. 



Fig. 8. liHrninim ,'//«r/«Ai— Tuberculated variety. Riviere-du-Loup. 

 iSrt — Sculi)tu .0 enlarged. 



Fig. 9. B.icciimm !)/aciak— Smooth variety. Riviere-du-Loup. f)a— 

 iScul]^yture enlarged. 



Fig. 10. Bucchmm ''J/m/»»i— (Fabricius.not Gould)— Smooth variety, 

 somewliat decorticated. Montreal. 10ft— Sculpture enlarged. 



Fig. 11. BurriitHm f(7m^(?;t— (Fabricius, not Gould) — Small but 

 mature specimen. Recent Murray ]}ay. 



Fig. 12. Biicchnim (7rii-)i/andicum— Adult specimen. St. Nicholas. 

 12a — Sculpture enlarged. 



Fig. 13. Chorixtes e/e,7««s— (Carpenter)— Adult specimen. Montreal. 

 I3rt — Sculpture enlarged. 



Fig. M. Capii/us commodns—Vt. Levis, Quebec. 



