larger, more ventricese 
the middle, with at six well 
Descriptions of a. - in Connecticut. 235 
Long. 332, lat. 14, alt. 2 poll. 
Shell thin, transversely oblong, somewhat widening backwards, 
anterior margin rounded, lower margin gently curved, posterior 
margin oblique, rather broadly truncated at tip, so as to form two 
angles, hinge margin straight. Beaks very small, undulated, sit- 
uated at the anterior third. Disc tumid behind the beaks. Epi- 
dermis smooth and shining, yellowish green. Viewed from above 
the shell appears sharply wedge-shaped, the greatest breadth be- 
ing behind the beaks. Interior bluish-white, with-stains of white 
towards the cavity. of the beaks. Anterior basal edge much 
thickened, as in A. im 
This shell is especially a aoe from our other species by 
its great anterior narrowiMg a 5 Wig ai its nvinute undula- 
tenui, rotundato-ovali, couvexiuscula, su 
equilaterali, costiolis radiantibus filiformi- 
bus ad 24, et lineis divaricantibus miero- 
scopicis sculptis ; auribus subequalibus, pos- 
tico vix emarginato; colore rubro-fusco. 
Fig. 6. ; 
Long. 5, lat. 4, poll. 
Shell s all, thin, somewhat elongated, 
a 
slightly convex, with about 24 thread-like 
radiating ribs; the whole surface, viewed 
with a magnifier, is found to be we pry Pecten fuscus. 
with microscopic lines, which curve from the-centre towards the 
sides without reference to the hy The ears are nearly equal, 
the anterior one with three ribs, the > posterior one slightly emar- 
ginate. Color a dusky re 
I have seen only one valve, which difere from apy shell hith- 
erto described, but the characters of the entire shell are of course 
incomplete. 
eLIx Trumpu tt, (No, 170,) is Skenea serpuloides. 
Lacuna, (No. 243,) is very imperfect—too much'so to jetta 
dceeriesing, It ” aga ts to be a worn specimen of some Cingula. 
RUMBULLL (No. 269.) — Sg Ptehes 
clongato-conica, solida, levi, albida ; 
sutura in pressa, marginata ; pace ae angulato apers 
tura angusta, elongata ; columella assem anticé striis 
volventibus arata. Fig. 7, 
Long. ;';, lat. ;'y poll. 
small, rather Pentriaese. aul solid pay moron sie to 
be distinguished fromthe following shell. On a 
exar nation it will. be found te difler m being ra pen, Truraballi 
e , the last. whorl seat angular about 
ll marked furrows,revolving about 
