Astart^. 
MOLLUSCA. LUCINAD^. 
441 
6. A. lineata. — Obovate, transversely depressed ; slightly truncated ; with 
a few concentric acute ridges, and many minute intervening striae upon the 
surface; lunette lanceolate, small; margin entire. — Sower. Min. Conch, 
t. clxxix. f. \.-^Upper Oolite. 
7. A. excavata Obovate, convex, concentrically costated, truncated re- 
trally ; lunette hemispherical, excavated ; cartilage enclosed in a sulcus ; 
margin toothed.— Sower. Min. Conch, t. ccxxxiii.— Uncfer Oolite. 
8. A.p/aw«to.-— Transversely obovate, gibbose, with small obtuse concentric 
ridges ; edges’ crenulated ; lunette concave. — Sower. Min. Conch, t. cclvii — 
In Crag. 
9. A. rugata. Obovate, anteriorly subtruncated, when young transversely 
costated, afterwards slightly wrinkled ; edge internally crenulated ; lunette 
concave, obovate, pointed. — Sower. Min. Conch, t. cccxi.— Lowcfow Clay. 
10. A. ohovaia. — Obovate, uniformly convex, corrugated ; lunette com- 
pressed ; anterior margin subtruncated, inner edge crenulated. — Sower. Min. 
Conch, t. cccliii . — Irm Sand. 
11. A. trigonalis Cordato-triangular, depressed, transversely sulcated; 
beak pointed ; anterior side separated by an angle, smooth.— (Sower. Min. 
Conch, t. ccccxliv. f. 1. — Inferior Oolite. 
12. A. orbicularis. — Lenticular, with many concentric reflected lamellae up- 
on its surface ; edge smooth. — Sower. Min. Conch, t. ccccxliv. f. 2, 3. — Upper 
Oolite. 
13. A. jowmito.— Obliquely obovate, slightly convex, with numerous con- 
centric ridges ; edge crenated within. — Sower. Min. Conch, t. cccxliv. f. 4. 
5, 6.-^Upper Oolite, 
14. A. striata — Lenticular, transversely striated ; lunette ovate, flat, deep- 
ly sunk, shell thick — Sower. Min. Conch, t. dxx. f. 1. — Green Sand. 
15. A. or5icM/«ris.— Lenticular, rather gibbose, concentrically furrowed ; 
furrows small ; posterior surface plaited with an angle at its edge, lunette 
elongated, very deep. — Sotoer. Min. Conch, t, dxx. f. 2. — Oolite. 
16. A. imbrimta. — Ck>rdate, orbicular, largely imbricated, convex ; tooth in 
the left valve beneath the lunette small ; lunette elongated, flat ; hinge line 
arched ; edge finely crenulated.— <S'ower. Min. Conch, t. Dxxi. f. 1. — Suffolk, 
Crag. 
17* A. Transversely obovate, angular above, rather depressed, mi- 
nutely sulcated near the beaks, the rest even ; beaks pointed ; lunette lan- 
ceolate ; edge crenated.-— Min. Conch, t. Dxxi. f. 2. — Suffolk, Crag. 
18. A. bipartita — ^Obcordate, gibbose ; six or eight large undulations upon 
a flat space near the beak, the rest of the surface even ; beaks acute ; edge 
toothed. — Sower. Min. Conch, t. DXxi. f. 3.— Suffolk, Crag. 
19. A. oblonga.- — Transversely oblong, convex ; surface largely waved ; 
beaks small ; lunette cordate, pointed, concave ; edge crenated.— (Sower. Min. 
Conch, t. DXxi. f. 4.— Suffolk, Crag. 
Gen. CXXIV. LUCINA. — Orbicular, two teeth in each valve, 
with lateral teeth. 
* StricB concentric. 
504. L. radula . — Shell with numerous raised striae, and shal- 
low, broad, intervening spaces. 
