DESCRIPTIONS OF SPECIES 373 



."A specimen of l L. jonesi' [from the Waterlime of the Lower Helderberg] in 

 the American Museum of Natural History at New York 1 have observed to have 

 not only a reticulate muscle spot [characteristic of well preserved specimens of the 

 species], but also to be somewhat gibbous on the postero-dorsal margin of the left 

 valve." 



If the dorsal hump exists in L. jonesi, another link is established in 

 the relationships between the faunas of the Coralline limestone and the 

 Manlius limestone of Erie county. 



References 



Bishop, 1895. Irving P. Bishop: "The structural and economic geology of Erie 

 county." Fifteenth Annual Report of the State Geologist of New York, 1895, 

 pages 305-392. 



Chamberlin, 1877. T. C. Chamberlin : "Geology of eastern Wisconsin." Re- 

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 390-395. 



Clarke and Schuchert, 1899. John M. Clarke and Charles Schuchert : "The 

 nomenclature of the New York series of geological formations." Science, 

 new series, December 15, 1899, volume x, number 259, pages 874-878. 



Clarke, 1900. J. M. Clarke : " The Oriskany fauna of Becraft mountain, Co- 

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Hall, 1843. James Hall : Geological Survey of New York. Report of the Fourth 

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Orton, 1893. Edward Orton : "Geological scale and geological structure of 



Ohio." Report of the Geological Survey of Ohio, 1893, volume 7, chapter i, 



pages 3-44. 

 Rominger, 1876. C. Rominger : "Geology of Lower Peninsula." Geological 



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 Schuchert, 1900. Charles Schuchert : " The Lower Devonic aspect of the Lower 



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America, 1899, volume 11, pages 241-332. 

 Weller, 1899. Stewart Welle r : "A peculiar Devonian deposit in northeastern 



Illinois." Journal of Geology, volume 7, number 5, July and August, pages 



483-488. 

 Whitfield, 1882. R. P. Whitfield : " Paleontology of Wisconsin." Report of the 



Geological Survey of Wisconsin, volume iv, part iii, pages 320-323. 

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Report of the Geological Survey of Ohio, 1893, volume 7, chapter iii, pages 



406-494. 



