30 
BULLETIN OF THE LABORATORIES 
figure. The anterior margin is subtruncate in some specimens, and the 
lower margin is nearly straight and parallel with the axis of the shell ; 
the posterior margin is evenly curved, the greatest convexity being in 
the middle of the height of the shell. The largest specimen measures 
1.20 in length and .75 in width, the smallest, 1.12 by .66. 
The surface in each was covered by rather strong, variable, con- 
centric lines. The middle of the valve is nearly uniformly convex, 
sometimes with a shallow depression extending from near the beak to 
the lower margin; shell slightly gaping behind. 
2. Solenomya i?) meelciana, sp. n • 
(Plate IV, Fig. 9 ) 
This is a much more elongated species or variety, otherwise almost 
identical, though the specimens observed were all smaller. Nearly 
quadrate, elongate, more than twice as long as wide ; sides parallel, 
straight ; posterior outline gently curved; anterior outline somewhat 
truncate, not produced ; convexity somewhat greatest near the beak, 
but entire valve nearly equally convex, sloping gently and almost 
equally to the entire margin. Length, 1.05, width, .50. Surface 
marked as in the previous variety. Although Meek (Geol. Surv. Neb. 
p. 23,3 ; Plate IV, Fig. 7,) refers to Edmondia a species almost cer- 
tainly identical with ours, as E. reflexa, comparison with the typical 
form, shows that it is far from probable that the specific reference (if the 
generic) could be sustained. It may be better to apply a new name, 
as suggested, and await farther evidence as to the relation to S. ano- 
dontoides. 
Solenomya suhradiata, sp n- 
(Plate III, Fig. 8. ) 
This species somewhat resembles S. radiata, M. and W., but is 
much more elongated and expanded posteriorly. The shell is very 
thin and is somewhat compressed in the only specimens seen. Very 
narrowly oval and slightly convex ; posterior dorsal line straight ; pos- 
terior margin a regular curve ; lower margin a uniform slight curve ; 
umbo 4-5 the length from the posterior extremity, anterio-dorsal line 
convex, inclined abruptly from beak ; anterior part of shell produced 
below in a strong ‘‘ heel.” Surface with very obscure concentric lines 
