282 BULLETIN OF THE 



Tropidoleptus carinatus Coxrad sp. 



Slrophomena carinatus Conrad. Ann. Geol. Kept, of N. Y., 1839, p. 34. 



Several slabs* of coarse gray sandstone from the island of Coati, two miles 

 southeast of the island of Titicaca, are covered by well-preserved casts of 

 this species undistinguishable from the forms so abundant in the Hamilton 

 group of New York and the Devonian sandstone of Erere, Brazil (Rathburn, 

 Bull, of Buffalo Soc. Nat. Sci., Jan. 1874). 



The Coati specimens are of large size, with very heavy dental plates and 

 septum. 



The undetermined species of Orthis figured by Salter (Quart. Jour. Geol. 

 Soc, Vol. XVII., PI. IV. Fig. 7) appears to me to belong to this species. 



Vitulina pustulosa Hall. 



Vitulina pustulosa Hall, 13th Kept. State Cab.; Pal. of N. Y., Vol. IV. 

 p. 410, PI. 



Associated with the preceding are casts differing in no respect from those 

 of this species so abundant at Erere, Brazil. 



This extremely interesting collection adds considerably to our knowl- 

 edge of the geology of the Andes and the relation of the fossils occur- 

 ring there to those of other parts of the world. Of the nine Carbonif- 

 erous species, all but Euomphalus antiquus are represented in the Coal 

 Measures of North America and Brazil by identical or closely allied 

 forms. In a discussion of the relations of the South American Car- 

 boniferous fossils thus far known, I have shown that all the beds yet 

 examined belong to this division of the Carboniferous age.t These 

 beds are now known at a number of widely separated points in Bolivia 

 and Peru, showing a very extended range of the Carboniferous deposits. 

 Besides the numerous localities in and about Lake Titicaca, they are 

 known in the provinces of Arque and Oruro, south of the lake, at Santa 

 Cruz and Cochabamba, on the eastern slope of the Andes, and on the 

 Pichis River, one of the upper tributaries of the Ucayali, in Southern 

 Peru. More recently I have recognized in Professor Orton's collection 

 specimens of a Productus and a Streptorhynchus from near Moyabamba, 

 in Northern Peru. It is interesting to note in this connection that 



* These slabs were not found in place, and may have been brought to the island for 

 building purposes by the Incas (A. Agassiz). 



f Bulletin of the Cornell University, Vol. I. No. 2, p. 60. 



