PLATE XC1—Continued. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
• Leptodesma Maclurii. 
Page 228. 
See Plate 25. 
13. A large left valve of this species. This figure is given in correction of fig. 13, plate 25. 
Chemung group. Near Smethgort, Pa. 
14. The right valve figured on plate 25, fig. 8, redrawn to correct the outline. 
Chemung group. Near Smetbport, Pa. 
Leptodesma quadratum. 
Page 233. 
15. The left valve described. 
Chemung group. Steuben Co., N. Y. 
Leptodesma propinquum. 
[Page 231. 
16. A nearly entire left valve, showing the form and characters of the species. 
Chemung group. Mansfield, Pa. 
17. A similar rig-ht valve. 
Chemung group. Mansfield, Pa. 
18. A left valve of this species. 
Chemung group. 
Leptodesma Piiaon. 
Page 230. 
Mansfield, Pa. 
Leptodesma Lichas. 
Page 232. 
See Plate 21. 
19. A small left valve. 
Chemung group. Steuben Co., N. Y. 
20. The left valve figured on plate 21, fig. 37, redrawn to correct the outline. 
Chemung group. Philipsburg, N. Y. 
f — Mytiloidea. 
Leptodesma acutirostrum. 
Page 234. 
21. The left valve described, showing the form of the body and the acute anterior end. 
Chemung group. Warren, Pa. 
Leptodesma mytiliforme. 
Page 235. 
See Plate 25. 
22. The right valve figured on plate 25, fig-. 7, redrawn to correct the outline and the form of the body. 
23. A small left valve. 
24. A view of left valve given in correction of fig. 11, plate 25. 
25. Two left valves as preserved on the surface of a piece of sandstone. 
Chemung group. Road from Clean to Smethport, Pa. 
