DESCRIPTION OF PLATES. 



PLATE I. 

 Fig. 1. Tellina calcarea (Beauport, Canada). — 2. Terebratula psittacea (Beauport, Canada). — 

 Valves although delicate and thin, yet are perfect and unbroken, and frequently both in position. — 3. 

 Tellina groinlandica. Common the whole length of Lake Champlain. — 4. Pecten islandiciis (Beau- 

 port). — 5. Saxicava rugosa. Common the whole length of Lake Champlain. At Beauport it forms 

 a mass ten feet thick, made up almost wholly of this species. This, with Tellina grosnlandica, is found 

 on the St. Lawrence at Ogdensburgh. — 6. Patella. — 7. Undetermined. — 8. Mya truncata, abundant 



at Beauport. — 9. Mya . — 10. Mytilus edulis. Tliis was pronounced by Mr. Conrad a ModioJa, 



and it was thus given in the annual reports. It is abundant at Port Kent. It is a thinner shell than the 

 one found at Uddervalla in Sweden. 



PLATE II. 

 Fig. 1. Tritonium anglicum (Beauport). It is found recent at Portland in Maine. — 2. Tritonium? 

 — 3. Tritonium fornicatum. — 4. Scalaria borealis. — 5. Undetermined. — 6. Astarte (Portland). — 

 7. Natica clausa (Beauport). The recent species abundant on the Atlantic coast. — 8. Velutina galeri- 

 culata. Brown. (Rare at Beauport) — 9. Mya arenaria. Common at several places on Lake Cham- 

 plain, and at Lubec in Maine. — 10. Turritella. — 1 1. Elongated valves of the Balanus miser? (Beau- 

 port). — 12. Nucula portlandica. — 13. Bulla. — 14. Undetermined. 



PLATE III. 



Ground plan of the veins of magnetic o.xide of iron at Adirondack. The Adirondack river cuts 

 through the hj^persthene rock. The ore appears on each side, and apparently passes beneath the rock. 

 It sends out from the main mass a narrow vein, as represented in the plate, running S. 25° E. Natural 

 joints and divisional seams are represented in the plate. 



PLATE IV. 



This represents the relative position of all the veins of ore which have been discovered at Adirondack. 

 They all disappear beneath the hypersthene, and no regular walls have yet been found. 



PLATE V. 



The ground plan of tlie veins of lead at Rossie are laid dowTi in this plate from actual survey. 



