NAPLES FAUNA IN WESTERN NEW YORK, PART 2 24 1 



of the axial line. Slope quite abrupt to the anterior margin. Surface 

 smooth with fine concentric lines, but no other ornamentation except one or 

 two short plications directly behind the beak. 



I am unable to detect in the descriptions and illustrations of this 

 species which have been given by Holzapfel and Beushausen, any differ- 

 ences from shells occurring in the Naples fauna at and west of the Genesee 

 river. The species was first quoted from Martenberg near Adorf, Bicken 

 (Holzapfel) and other localities ; Beushausen adds Oberscheld, all in the 

 lower Upper Devonic. 



It seems probable that these shells are identical with those described 

 by Williams as above cited, though I have been unable to obtain access to 

 the original specimens of L. laeve or to examples regarded by the author 

 as of typical character. Our shells vary notably in size but without change 

 in essential characters. Lunulicardium laeve was characterized as 

 of "medium size, obliquely oval, with sharp, short beak nearly central, with 

 byssal gap starting close under the beak on the anterior side and reaching 

 obliquely about one half the length of the shell, lip reflected in the left 

 valve and inflected in the right valve, the front broadly rounded and 

 curving around regularly to near the beak on the posterior margin, upon 

 which are two or three well defined radiating plications which may be 

 lateral cardinal teeth. Surface nearly smooth, with concentric lines of 

 growth and very fine radiate striae." 



The species differs from L. e n o d e in its shorter, less oblique sical 

 margin, and from L. absegmen in the same respect as well as its smaller 

 diameter across the pallial region. 



If proper allowance be made for the compression to which these shale 

 specimens have been subjected, it will be difficult to distinguish them from 

 L. i n fl a t u m Holz. (Martenberg). 1 



Habitat. Genesee province ; Chautauqua subprovince. Lower Portage 

 falls of the Genesee river ; Buck run near Mount Morris; Johnson's falls, 



1 See Holzapfel, op. cit. 1882. p. 33, pi. 6, fig. 11, and compare his figure with ours 

 on pi. 3, fig. 3. See also Beushausen, op. cit. p. 377, pi. 28, fig. 6, 7. 



