A MA ZONIA N UPPER CA RB ONIFER O US FA UNA . 497 



Conocardium sp. —Too imperfect for positive identification 

 but apparently new. The ornamentation is similar to that of 

 C. obliquum, Meek & Worthen. 



Astartella (?) sp. — A shell agreeing in hinge characters with 

 Hall's type, A. vera, from Iowa is quite abundant at Itaituba and 

 Pacoval. A Nebraska shell described by Geinitz as Astarte neb- 

 rascensis, but thought by Meek to be an Edmondia or Cardiomorpha,. 

 is similar in form and ornamentation but probably generically dis- 

 tinct. In the National Museum at Washington there is a shell 

 from Lake Titicaca showing the hinge, which is identical with 

 the Brazilian forms. This is very likely the Trigonia antiqua of 

 d'Orbigny. 



Pleurophorus. — Two species occur, one of which is apparently 

 identical with P. tropidophorus, Meek, though no direct compari- 

 son of specimens could be made. The other and larger form is 

 apparently new, though resembling somewhat an undetermined 

 species figured on plate XXVI. , fig. 6b, of vol. V. of the Illinois 

 report. 



Allorisma subcuneata. — Compared with authentic specimens 

 from the western United States, the Brazilian form appears iden- 

 tical. 



Allorisma sp. — Possibly a variety of the preceding but prob- 

 ably distinct. 



Allorisma (?) sp. — Similar in form to Edmondia? glabra \ 

 Meek, but appearing to have a sinuated pallial line which, if not 

 a deceptive appearance, would place it in Allorisma. 



Sedgwickia (?) sp. — A large pyriform shell with a double 

 umbonal ridge is here referred. Nothing like it has been seen 

 from North America. 



Chaefiomya (?) sp. — A large shell of the general type of C. 

 cooperi, Meek & Hayden, but probably distinct from that 

 species. 



Pleiirotomaria. — The general character of the Pleurotomarias 

 of this fauna is indicated by the doubtful identifications and com- 



