210 
CONOHIFERA. 
Astarte. 
side teeth; those of the latter cleft in the right valve, in order 
to receive the opposite ones. 
1. Piscidium Henslowiana. —Henslow’s Piscidium, pi. 
LX XXVI. fig. 27. 
P. Henslowiana . Thompson, Ann. Nat. Hist. VI. p. 54. 
P. appendiculata. Brown, Ill. Rec. Conch. Brit. p. 95, pi. 39, 
fig. 25. 
Obliquely oval, much inflated ; beaks tumid, considerably 
produced, and somewhat tuberculated ; surface with regular, 
well-defined, concentric grooves. 
The Pleistocene Fresh-water Formations, Clackton, Stutton, 
Crap thorn, and Grays. 
2. Piscidium amnicum. —The Favourite Piscidium, pi. 
LXXXVI. fig. 10. 
P. obliquum. Brown, Ill. Rec. Conch. Brit. p. 94, pi. 39, 
fig. 22. 
Obliquely oval; beaks tumid, a little produced; surface 
with numerous concentric furrows, which are finely striated. 
The Pleistocene Fresh-water Formations, Grays, Eritli, 
Crapthorn, Clackton, Stutton, and Feverskam. 
3. Piscidium pusillum. —The Weak Piscidium, pi. 
LXXXVI. fig. ll. 
P. pusillum. Brown, Ill. Rec. Conch. Brit. p. 95, pi. 29, 
fig. 28. 
Slightly ovate, nearly orbicular, sub-compressed, with pro¬ 
minent beaks, obtuse at the points ; sides somewhat flattened; 
surface with very fine concentric strice. 
The Pleistocene Fresh-water Formations, Harwich, Cop- 
ford, Grays, Clackton, Stutton, and Crapthorn. 
Grand Division III.—TENUIPEDES. 
The mantle barely united before ; foot small, narrow, and 
compressed ; shell having but a moderate gape. 
Tribe I.—NYMPIIACEA. 
Having never more than two primary teeth in the same 
valve; shell often gaping slightly at the lateral extremities ; 
ligament external; umboncs generally projecting outwards. 
Sub-division I.—Destitute of lateral teeth. 
Genus XXXVI —AST A RTE— Sowerby. 
Shell sub-orbicular, transverse, equivalve, inequilateral; 
hinge with two strong, divergent, cardinal tooth in the 
right valve, and two uuequal primary tooth, and one small, 
nearly obsolete tooth, togother with an indistinct lateral 
one in the left valve; two ovate or oblong, remote, lateral, 
simplo muscular impressions in each valve, with a third very 
small one, situate immediately below tho indistinct lateral 
tooth, or at the end of the posterior external depression, and, 
in some instances, mingling with the lower termination of the 
posterior muscular impression, which is always simple and not 
sinuated; ligament external. 
1. Astarte lurida.—T he Pale Astarte, pi. LXXXVII. 
figs. 10 and 42. 
A. lurida. Sowerby, II. pi. 137, fig. 1. 
Convex, transversely oblong, its width being one and a half 
its length ; depressed; surface with numerous transverse, 
unequal ribs; margin internally crenulated; lunette elliptical. 
Oxford Clay, Scarborough, and Inferior Oolite, Dundry, 
Oxfordshire. 
2. Astarte elegans.—T he Elegant Astarte, pi. 
LXXXVII. fig. 12. 
A. elegans. Sowerby, II. p. 86, pi. 137, fig. 3. 
Convex, transversely oblong ; disk depressed ; surface with 
numerous small, transverse ribs; lunette cordate; margin 
internally crenulated. 
Differs from C . lurida , in the front being more rounded, the back less 
rounded, and the teeth are more distant. 
Coralline Oolite, Malton, Yorkshire; the Inferior Oolite, 
Yeovel and Brora, and the Lias, Prees and Whitby. 
3. Astarte cuneata.—T he Wedge-shaped Astarte, pi. 
LXXXVII. fig. 31. 
A. cuneata. Sowerby, II. p. 86, pi. 137, fig. 2. 
Gibbose, somewhat heart-shaped, or sub-triangular; back 
broad and flattened ; anterior side produced; lunette heart- 
shaped ; margin entire within. 
The Greensand, Blackdown, and Portland Sand, Tisbury 
and Garsington. 
4. Astarte excavata.—T he Excavated Astarte, pi. 
LXXXVII. fig. 22. 
A. excavata Sowerby, I. p. 57, pi. 233. 
Convex, obovate, nearly one-third wider than long; ante¬ 
rior side truncated; back arched; beaks ill-defined, greatly 
inclined to the posterior side, which is small; lunette hemi¬ 
spherical ; excavated; cartilage enclosed in a deep furrow, 
bounded by sharp edges, which nearly approach each other; 
margin toothed ; surface with flat, transverse ribs, which, in 
tho anterior side, run into irregular undulations ; teeth slightly 
striate. 
The Inferior Oolite, Dundry, Somersetshire, and tho Lias 
of Banz. 
5. Astarte nitida.—S hining Astarte, pi. LXXXVII. f. 8. 
A. nitida. Sowerby, I. p. 37, pi. 521, fig. 2. 
Somewhat depressed, transversely obovate; angular above ; 
beaks pointed; lunette lauoeolate; surface plain, and rather 
minutely sulcated near tho beaks; edge crenulated. 
Coralline Crag, Ramshot. 
6. Astarte bipartita.—T he Double-parted Astarte, pi. 
XXXVII. fig. 7. 
A. bipartita. Sowerby, VI. p. 38, pi. 521, fig. 3. 
Globose; obcordate; beaks acute; lunette largo, short, 
concave, and smooth ; surface with from six to eight large, 
flat, transverse ribs, placed on the flat space near the beaks; 
internal edge crenulated. 
Coralline Crag, Ramshot. 
7. Astarte oblonga. — The Oblong Astarte, pi. 
LXXXVII. fig. 15. 
A. oblonga. Sowerby, VI. p. 38, pi. 521, fig. 4. 
Convex; transversely oblong; beaks small, and not very 
prominent; lunette heart-shaped, pointed, and concavo; sur¬ 
face with large, transverse ribs ; interior edge crenated. 
