The Loess of Natche::, Miss. — Shimek. 299 
PLATE XII. 
LOOKING WEST ALONG THE N. O. & N. W. R.R. FROM A POINT 
NEAR ITS EASTERN TERMINUS. THE EXCAVATION TO 
THE RIGHT IS EXPOSURE NO. 1. THE OVER-HEAD 
BRIDGE IN THE BACK-GROUND IS ON 
CANAL STREET. 
PLATE XIII. 
THE FIGURES ARE ALL NATURAL SIZE. NUMEROUS LARGE 
NODULES WERE FOUND, BUT NONE CONTAINED A 
GREATER NUMBER OF SHELLS THAN 
THOSE FIGURED. 
EXPLANATION OF PLATE XIV. 
Fig. I. Polygyra albolabris (Say)Pils. 
2. " exoleta (Binn.)Pils. 
3. " profunda (Say) Pils. 
4. " elevata (Say) Pils. 
5 " obstricta (Say) Pils. The upper specimen has lost the 
parietal tooth. 
6. " thyroides bucculenta (Gld.) Pils. The upper specimen 
without parietal tooth. 
7. " stenotrema (Fer.)Pils. 
8- " monodon fraterna (Say) Pils. 
9. " monodon (Rack.) Pils. 
ID. ■■ hirsuta (Say) Pils. 
II. '■ inflecta (Say) Pils. 
12- Omphalina kopnodes (Binn.)Pils. 
13. Pyramidula alt.ernata (Say) Pils. 
14. " alternata costata (Lewis) Clapp. 
15. Circinaria concava (Say) Pils. 
16. Succinea ovalis Say. 
17. Gastrodonta ligera (Say) Pils. 
18. Pyramidula perspectiva (Say) Pils- 
19. Cochlicopa lubrica (Mull.) 
20. Helicina orbiculata Say. 
21. Vitrea indentata (Say) Pils- 
Two views of each species are given, front and lower surface, ex- 
cepting in figs. /) and 19, of each of which only one view is given, and 
13 and 14 which show three views each. The figures are natural size. 
PLATE XV. 
VIEW OF NATCHEZ BLUFFS, LOOKING SOUTHWESTWARD. AT LOW 
WATER THE WATER IN THE FOREGROUND RECEDES AND EX- 
POSES EXTENSIVE MUD-BARS. EXPOSURE No. 26 IS JUST 
VISIBLE NEAR THE TOP OF THE HILL ALONG THR ROAD 
IN THE FOREGROUND. THE DEEP CUT IN THE PROJECT- 
ING POINT OF THE BLUFF IN THE BACKGROUND IS 
EXPOSURE ALONG THE N. O. & N. W. R. R. EXPOS- 
URES 5, 6, 7 AND S ALSO SHOW INDISTINCTLY. 
