114 THE NAUTILUS. 



CYCLEMIS Raf. , loc. cit. Species C. minutissima and C. oliv- 

 acea, undescribed. C. olivacea here selected as type. Undeter- 

 minable, but the type may be Viviparus intertextus Say. 



OMPHEMIS Raf. , loc. cit. Species 0. lacustris and 0. phaioxis 

 Raf., undescribed. Type 0. lacustris here selected ; not deter- 

 minable, but provisionally it might be identified with Viviparus 

 contectoides W. G. B. I think that Cyclemis and Omphemis were 

 based, at least partly, on Viviparus. 



LOMASTOMA Raf. , loc. cit. Monotype L. terebrina Raf. Not 

 determinate. Imaginary ? 



EUTREMA Raf., loc. cit. Monotype E. terebroides Raf. 

 Mythical ? 



DUPLICABIA Raf., Atlantic Journal etc., No. 5, p. 165, 1833. 

 Monotype D. bonariensis R&t. = Chilina fluminea (Maton). 



SUMMARY. 



AMBLOXIS will have to be used for the genus commonly known 

 as Melantho or Campeloma ; Campeloma, and in part, Ambloxus, 

 becoming synonyms. 



PLEUROCERA replaces Angitrema (of Tryon's monograph), at 

 least for species congeneric with verrucosa. (Pleurocera of Try on 

 will become CERIPHASIA Swainson). 



LEPTOXIS will replace Anculosa. 



All of the other names which I have been able to identify 

 become synonyms of genera of earlier dates. 



A COLOR-MARKED ETTCONOSPIRA FROM THE PENNSYLVANIAN OF 

 MISSOURI, AND A LIST OF REFERENCES TO COLORATION IN 



FOSSIL SHELLS. 



BY DARLING K. QREGER, COLUMBIA, MO. 



An examination of the extensive series of Pennsylvanian 

 fossils from the vicinity of Kansas City, Missouri, in the Uni- 

 versity of Missouri collection, brings to light two specimens of 

 gastropods retaining traces of coloration. The material" comes 

 from the oolitic layer of the Drum member. The oolite is light 

 buff or gray and the greater number of its many fossils are of 

 the same light color. The sbell which I figure on the accom- 



