OF CONCHOLOGY. 



99 



CAMPTONECTES, Agassiz. 



C. ARGILLENSIS, Conrad. — (Pecten) Journ Acad. Nat. Sci. 2d 

 series, vol. iv, p. 283, pi. 47, fig. 3. 



C. BELLiscuLPTUS, Coiirad. — PL 9, fig. 11. 



Description. — Ovate, compressed, thin and fragile; divaricating 

 radii distinct ; concentric lines extremely thin and minute ; in- 

 terior hinge line crenulated. 



Locality. — Haddonfield, N. J. 



The above description applies to the lower valve. I have not 

 seen the opposite valve. 



SIN^YCLONEMA? Meek. ^ 



S. SIMPLICIA. — PI. 9, fig. 20. 



The lower valve was represented in the Journ. Acad. vol. iv, 

 pl. 46, fig. 44. The upper valve is here figured. It is remark- 

 able for the prominence of the concentric striae, and has a few 

 obsolete remote ribs. 



Locality. — Haddonfield, N. J. 



EADULA, Klein, 



R. DENTicuTicosTA. — PI. 9, fig. 17 [Ctenoides) Gabb, Proceed. 

 Acad. Nat. Sci. 1861, p. 327. 



The ribs of the shell, when perfect, are sharply and minutely 

 carinated as well as crenulated. 



Locality. — Haddonfield, N. J. 



TELLINID.E. 



METIS, H. and A. Adams. 



This genus, -which H. and A. Adams place as a subgenus un- 

 der Tellinidce, is nearly related to Macoma by the hinge charac- 

 ter, but has a shorter and more ventricose and obtuse form. It 

 is readily recognised by its subequal sides, the broad furrow on 

 the middle of the right valve, and angular fold on the umbonal 

 slope. It occurs in a fossil state, and the following species com- 

 prise all that are known to me : 



M. hiplicata, Conrad [Tellina)^ 



M. medialis, Conrad ( Tellina), > Miocene. 



M. unda, Conrad [Tellina), ) 



M. tumescens, Dixon, Eocene. 



Mr. Gabb has made a mistake in referring 3L medialis,''. Con- 



