TABLE II. 



TRItOBiTES, FROM P. III., A; GASTEROPODA AND BRACHIOFODA, FROM F. II. AND F. III., A; TOGETHER. WITH FUCOIDAL 

 IMPRESSIONS, (?) FROM THE RED SANDSTONES OF LAKE SUPERIOR. 



Tab. II., Figs. I, 2. Fii.ioirlal impressions ('), from the Red SciiKlstoiies ol' L;iko Superior. For conclu.'5ions regarding Fig. 1, 

 tlie reader is referred to the remark.? on Tab. I. c. 

 " Fig. 3. Asapluts (Isoldus) loivcnsis (N. S.), from Turkey River, lowa, iu F. 3. Restored view. 

 " Fig. 4. Glabella of the same. 

 " Fig. 5. Compound edge of the same. 



'• Fig. 0. Pleurolomaria muralis. Lower Fort Garry, Red River of the North, in Magnesian Limestone, F. 3. 



Fig. 7. Pleurolomaria (iimbilicata ?). Prairie du Chien, in the shell-beds, F. 3, a. Though the spire of this Pleuro- 

 lomaria is considerably elevated, and the third carination or ridge very obscure, yet it is probable 

 that it may still be referred to the species umbilieal a, which occurs both in the Bird'seye and Trenton 

 Limestone of New York, and is very variable in its form. 

 In many respects it approaches Pleurotomaria delphimdoides of Goldfuss, but the spire is shorter, tlie 

 convolutions fewer and wider apart and more e.-cpanded. This fossil occurs in the butf-coloured 

 shell-beds (F. 3, a) at Prairie du Chien. In the correspoHding beds at the Falls of St. Anthony, a 

 cast of a smaller analogous gasteropod is common, which appears to be in every respect like the 

 New York P. imibilicata. 



" Fig. 8. Murrhisonia belUcivcla. Cast. Elkader Mills, Turkey River, Iowa, in F. 3. 



" Fig. 0. Marroclicilus (N. S.?) Cast. This fossil bears a strong resemblance to M. subeostatiis, D'OA.; Buccinum 

 Sihlotheimii, Vern.; but as that fossil seems to be a Devonian species, it is probable that this must be 

 (lifl'erent, as it occurs in the JMagnesian Limestones of Turkey River, Iowa, in F. 3, associated with 

 fig. 8. 



" Figs. 10, IL Holnpea (species imdetermined ). Cast. Elkader Mills, Turkey River, Iowa. This fossil is allied to 



H. obliqua, Pi. xxxvii., fig. 2, Hall's Palceontology, and iriay be the same species. 

 " Figs. 12, 13. Slraparollus (Euomphalus) Minnesoiensis, (N. S.) Cast. In the Lower Magnesian Limestone of 



Traverse des Sioux, St. Peter's River. 

 " Fig. 14. P/fzfco/oman'a (sp. undetermined). Cast. Elkader Mills. This fossil bears some resemblance to P. t«)?i6(7(- 



rata, except that the spire is much more depressed, and consequently the form mucli more discoidal. 

 " I'igs. 10, IG. Bueania, three miles above Fort Snelling, probably a new species, as it differs from the bidorsaia, 



e.rpansa, and pumtifrons ; the three species found in the corresponding strata of the New York 



System. 



" Figs. 17, 18. Leptmiia trilobala (N. S.), in the shell-beds, F. 3 A, near the Agency, on Turkey River, Iowa. This 

 fossil shell bears some resemblance to L. deltoidca of the Trenton Limestone of New York, but i.- 

 much more distinctly trilobate, with fully as much or greater convexity of shell than the L. ramerata. 

 as shown by tig. 18. 



" Fig. 10. PosidoHomya (Ambonyehia) beltistriata (?) of Hall. Cast. In the shell-beds of F. 3, A, at Prairie du Chien m 

 Wisconsin. 



" Fig. 20. A pustulated cephalic shield of a Trilobite, allied to Illamis arcturus, in F. 3. Lower Fort Garry, Red River 

 of the North. 



I 



