AMAZONIAN UPPER CARBONIFEROUS FAUNA. 49 l 



a point that can only be cleared up by a reexamination of the 

 material. At all events it seems to me more probable than his 

 suggestion that the two forms may occur in Brazil. As stated in 

 my paper, the Brazilian specimens differ somewhat from the gen- 

 erality of those seen from North America, while their correspond- 

 ence, especially in internal characters, with those from the Salt 

 Range, fully justifies Dr. Waagen's opinion of their identity. 



Athyris sublamellosa. — Some years ago I saw in the National 

 Museum, at Washington, shells from various western localities 

 variously referred to A. royssil, Eveille, A. kirsuta, Hall, and A. 

 orbicularis, McChesney, that I could not, from the external char- 

 acters seen, distinguish from the Brazilian and that occurred in 

 the same association, which is not the case with the original A. 

 sublamellosa. 



Athyris? sp. — A thick shell from Praia Grande, Rio Curua, 

 with acute umbonal ridges, giving it something of a Centronella 

 aspect, is here referred, on account of its resemblance to a form 

 from Spergen Hill, which is clearly an Athyris {^Spirigerella of 

 Waagen). 



Spirifer camaratus. — An examination of specimens from Lake 

 Titicaca (Bull. Mus. Comp. Zool. No. 12, p. 279) establishes the 

 identity of the Bolivian form [S. condor, d'Orbigny) with the 

 Brazilian. Dr. Waagen separates .S. condor and 5. musakheylensis 

 from the Salt Range, India from the North American form prin- 

 cipally on account of the prominence of the concentric lamellae. 

 On well preserved Brazilian specimens these are as strong as on 

 the Bolivian shells, and if they prove to be absent from equally 

 well preserved specimens of the North American form, the Bra- 

 zilian shells may have to be referred to the Bolivian or Indian 

 type. 



Spirifer rockymo7ita?ius. — ^. opimus in my paper. Dr. White 

 has shown that Marcou's name has precedence over that of 

 Hall. 



Spirifer (Martinia) perplexa. — Dr. Waagen, who adopts Mc- 

 Coy's name Reticidaria for shells of this type, is also of the opin- 



