56 PALAEONTOLOGY OF NEW YORK. 



liitrrnal fliaractfi> nut known. 



The specimen described, is a rijrlit vahc liaviiij; a length ul' ;i4 mm., 

 heif^ht 8(i nnn., and liinge-line about I'l mm. 



In outline and siu-f'ace characters this species resembles L. Priamus, but the 

 valve is more convex than the specimen referred to the right valve of that 

 species : it is also less oblicpie, and the beak more elevated and erect. The 

 rays of L. Priamus are distinctly and frequently bifurcating, while in this 

 species the fasciculate appearance is due to the sharp, elevated stria.' upon the 

 stronger rays. 



Formation and locality. Chemung group, Leon, Cattaraugus county, N. Y. 



Lykiopecten solox. 



PLATE X.XIV, FIU. 5. 

 LyrUtptcten solox, H.\i.i.. Pal. N. Y., vol. v, i>l. 1. Plates and Explanations: PI. 24, fig'. 5. Jan., 1883. 



SiiKi.i, of medium size, nearly circular; transverse axis not inclined to tlie hinge- 

 line ; margin regularly rounded, and sloping somewhat abruptly into the 

 Ijyssal sinus. 



Right valve moderately convex. Left valve unknown. 



Hinge-line straight, Icimtli about one-lialf the diameter of tlie shell, 

 extending farther on the anterior side. 



Beak obtuse, rounded, central, not rising above the hinge-liuc, directed 

 slightly forward ; um])0 ample. 



Po.sterior ear triangular, defined by its llattened surface, ami the rapid 

 umbonal slope ; margin concave ; extremity rectangular. Anterior ear 

 imperfect, l)ut showing a very deep and narrow byssal sinus. 



Test marked by numerous fine, angular rays, which are arranged in a])out 

 4(1 regular, rounded plications, comiiosed of fascicles of liner rays, with 

 defined inter.spaces. Finer obscure rays mark the umbo, and the posterior 

 ear shows three or four rounded undulations witli lines of growth. 



Literior not known, except the ligainental area, which is narrow, and 

 nuikes an inflection of the hinge-margin of the ears. 



