236 NEW FOSSIL SHELLS 
FAMILY SOLENIDA. 
GENUS SOLEN. 
S. macNnopentatus, Pu. 34. Fic. 8. 
S. testd antice truncatd, ct valdé hiante, lavi, politd, crassd; natibus compressis; dente laterali wno; dente cardinali wno, 
longo, acuto. 
Shell truncate, and gaping very much anteriorly, smooth, polished, thick ; beaks compressed ; with one lateral, and 
one long, acute, cardinal tooth. 
Diam.— Length— ‘ Breadth— 
Remarks.—Although I possess but a small fragment of this shell, yet it differs so 
essentially in the teeth from all of our Solenes, that I have no hesitation in pronouncing 
it distinct. I believe that it is the only extinct fossil species as yet found in our 
Tertiary. 
GENUS PANOPAGA. 
P. puspta, Pu. 34. Fia. 9. 
P. testa quadrato-ellipticd, transversd, inequilaterali, posticé truncatd, antic rotundatd, sub-inflatd, crassiusculd, striatd; 
sirus concentricis, regularibus ; margine basali recto; margine dorsali recto; nymphis magnis, cxsertis, longissimis; cardine 
cochlea parvd. 
Shell quadrately elliptical, transverse, inequilateral, posteriorly truncate, anteriorly rounded, somewhat inflated, ra- 
iher thick, striate; strie concentric, regular; basal margin straight; dorsal margin straight; beaks prominent; nymphee 
large, exserted, very long; hinge with a small fosset. 
Diam. .10 of an inch. Length .08. Breadth— 
Remarks.—The nymphe are unusually large, much exserted, and very long, extending 
the whole length of the dorsal margin. Near the beak, they are suddenly depressed and 
twisted round, and terminate in a small, shallow, internal fosset, or spoon-shaped tooth. 
It is not without some hesitation that I have placed this shell among the Panopwe, as 
it has a spoon-shaped tooth in place of an erect, pointed one, but there is no genus to 
which it can be said positively to belong, and I do not consider its peculiar characters 
sufficient to authorize the erection of a new one for its reception. It seems to connect the 
Glycymeris with the Anatina, having the nymphe of the one, and the spoon-shaped 
tooth of the other. 
FAMILY MYID/. 
GENUS MYA. 
M. REFLEXA, Pu. 34. Fie. 10. 
M. testa quadrilaterali, sub-inaquilaterali, posticé rotundatd, antice truncata et valde apertd, inflata, striatd; striis concen- 
irueis, wregularibus; clivo umboniali clevato, rotwndato; margine basali curvato; margine dorsali arcuato; natibus prominen- 
libus, wmeurvis. 
Shell quadrilateral, somewhat inequilateral, rounded posteriorly, truncate and very open anteriorly, inflated, 
striate; stris concentric, irregular; umbonial slope elevated, rounded; basal margin curved; dorsal margin arcuate ; 
beaks prominent, incurved. 
Diam. .18 of an inch. Length .22. Breadth .29, 
Remarks.—The opening at the anterior portion of the shell is remarkably large, and 
the margin there appears to be somewhat reflected. The stri# are more numerous and 
better characterized at the extremities, than in the central portion of the shell. 
