LAMELLIBRANCHIA TA. 
483 
SOLEN. 
S. Genus PALJIOSOLEN, n. s. g. 
Solen (PALiEOSOLEN) siliquoidea. 
PLATE LXXTIII, FIG. 33. 
Orthonota siliquoidea, Hall. Prelim. Notice Lamellibrancliiata, 2, p. 89. 1S70. 
“ “ “ Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 7S, fig-. 33. 1883. 
Shell solenoid; length more than four times the greatest height. Basal and 
cardinal margins sub-parallel. The cardinal margin is straight and the basal 
margin extends slightly downward posteriorly. Posterior extremity abruptly 
truncate, gaping. Anterior end very short, straight on the cardinal line and 
regularly rounded below. 
Shell sub-cylindrical. Yalves regularly convex their entire length. 
Beaks sub-anterior, low and undefined. Umbonal slope marked by a shal¬ 
low, indistinct diagonal groove, which is merged in the general convexity 
before reaching the post-inferior extremity. Post-cardinal slope wide, 
slightly undulated. 
Surface marked by fine concentric striae, the remains of which are pre¬ 
served in the cast. 
The specimen described has a length of 65 mm., a height at the beak of 
10 mm., and at the posterior end of 14 mm. 
This shell was originally placed under the genus Orthonota from its general 
similarity in form, and from a disinclination to propose another generic name; 
but a proper limitation of that genus requires the separation of this species. 
This species differs from any of the preceding in the regularly convex, cylin¬ 
drical form of the entire shell, and the gaping posterior extremity. 
Formation and locality. In the arenaceous beds of the Hamilton group in the 
southern part of Schoharie county, N. Y. 
