8o 
BULLETIN OF THE LABORATORIES 
quite acute, rather prominent, curved anteriorly, about two-fifths the 
entire length from the front, hinge-line gently curved posteriorly, with 
about ten teeth; anterior margin a gentle curve with the focus in the 
lower margin in. front of the middle; lower margin nearly straight be- 
hind, curving more rapidly as it approaches the front; posterior part 
of the shell narrow ; the greatest elongation anteriorly is near the 
juncture of trie lower and anterior margins. Judging from the cast 
the shell was very thick, no markings being preserved. Length 25; 
height 12; width ^6 (?); beak to front 9 ; height of beak above long- 
est axis 6 mm. 
This is apparently the species identified by Prof. Hall [Pal. N, Y. 
Vol. V,]'^with N. pandoriformis, Stevens. The original description of 
Dr. Stevens seems, however, to forbid the reference. 
J^’uciilana iLeda) saacata, Win. ? 
' '(Plate IX, Fig. 12.) 
A' single poor specimen from the same horizon as the above bears 
at least a superficial resemblance to the species quoted. 
Palaeoneilo elliptic^, ^p- n. 
{=■ PalcEoneilo conce?itrica^ authors, not cardinia concentrica, Win- 
chell.) 
Shell moderately thick, probably gaping somewhat behind, strong- 
ly and evenly convex ; outline nearly perfectly elliptical ; hinge line 
extending in front of the beaks, convexly curved posteriorly and con- 
cave in front ; about twelve oblique teeth in front and about twenty 
behind ; beaks about one-third to three-fourths the length from the 
front margin, incurved to near the mediam plane ; umbo moderately 
prominent, post-umbonal slope convex, parallel to the hinge-line ; pre- 
umbonal slope very steep, the umbonal ridge being concave upwards ; 
lower margin a uniform shallow curve ; anterior and posterior outlines 
strongly and similarly curved. Surface of valves marked by few, dis- 
tant, very prominent concentric ribs, the intervals being flat or con- 
