LAMELLIBRANCHIA TA. 
463 
SOLEMYA, Lamarck. 1818. 
( Janeia, King. 1850.) 
Solemya (Janeia) vetusta. 
PLATE XLV1I, FIGS. 53-55; and PLATE XCIV, FIG. 10. 
Solemya ( Janeia ) vetusta, Meek. Proc. Acad. Nat. Sci., Phila., p. 10. 1871. 
“ “ “ “ Pal. Ohio, vol. 1. p. 206, pi. IS, fig-. 4. 1873. 
Yoldia? valvulus, Hall and Whitfield. Twenty-fourth Ann. Rep. N. Y. State Mus. Nat. Hist., p. 190. 
1872. 
“ “ “ Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations; 
PI. 47, figs. 53-55. 1883. 
Shell of medium size, elongate-elliptical; length more than twice the height; 
basal margin very gently curved. Posterior extremity rounded. Cardinal 
line nearly straight, or gently arcuate. Anterior end large, narrower than 
the posterior, rather abruptly rounded at the extremity, carrying on its upper 
margin a distinct fold. 
Valves moderately convex below, scarcely gibbous in the upper portion. 
Beaks inconspicuous, situated anterior to the middle. 
Surface marked by regular, distinct, lamellose, undulating, concentric 
strife, which are crossed by distant radiating lines, between which the con¬ 
centric strife curve downward. 
Three specimens measure respectively 26, 27 and 35 in length, and 11, 12 
and 15 mm. in height. 
A careful examination has shown that this species is closely allied to 
Solemya, and we have not a sufficient knowledge of the interior structure to 
separate it from that genus. 
Formations and localities. In the clierty layers above the Hydraulic beds, at 
the falls of the Ohio, in strata referred to the Hamilton group. It is cited by 
Mr. Meek as occurring in the Corniferous limestone, at Dublin, O. 
