Cttherea. 
CONCHIFERA. 
205 
7. Venus qallina. —The Hen Venus, pi. LXXXIV. f. 10. 
V. gallina . Brown, Illust. Rec. Conch. Brit. &c. p. 89, pi. 
30, fig. 11. 
Sub-triangularly sub-cordiform ; moderately convex; beaks 
considerably turned to one side, and approximate ; lunette 
oblong, and longitudinally striated; surfaco with numerous 
prominent, rounded, concentric ribs ; internal margin finely 
crenated. 
The Pleistoceno Marine Formation, Ayr. 
8. Venus faba.—T he Bean Venus, pi. LXXXIV. figs. 
24,. 25. 
V. faba. Sowerby, VI. p. 129, pi. 567, fig. 3. 
Transversely obovatc; sub-compressed, flattened in the 
middle ; beaks short; lunette deep and lanceolate; surfaco 
with numerous fine concentric striae, and inequidistant lines of 
growth. 
The Lower Greensand, Parham and Blackdown. 
9. Venus elliptica. —The Elliptical Venus, pi. LXXXIII. 
fig. 9. 
V. elliptica. Phillips, Geo. York, II. p. 209, pi. 5, fig. 7. 
Elliptical ; compressed; posterior side a little narrowed; 
anterior side rounded ; surface with broad, concentric, shallow 
furrows. 
Tho Carboniferous Limestone, Northumberland. 
10. Venus gibbosa. —The Inflated Venus, pi. LXXXIV. 
fig. G. 
V. gibbosa. Sowerby IT. p. 12G, pi. 155, figs. 3, 4. 
Orbicular ; gibbous; hinge area very strong and broad ; an¬ 
terior side a little truncated; lunctto large and short; surfaco 
with distant concentric lines of growth ; inner edge with very 
fine, hardly visible crcnulations. 
The Crag, Suffolk. 
11. Venus turgida. —The Swollen Venus, pi. LXXXIV. 
fig. 1. 
V. turgida . Sowerby, III. p. 101, pi. 25G. Dosina tur- 
gidus. Wood. 
Orbicular ; gibbose; bingo strong ; beaks large, rounded ; 
surfaco with many distant, concentric ridges; inside with a 
series of inflated crcnulations a little way from tho margin, 
which is much thickened ; substance of the shell thick. 
The Red Crag, Sutton ; and the Coral Crag, Ramshot. 
12. Venus fasciata. —The Banded Venus, pi. LXXXIII. 
fig. 15. 
V. fasciata. Brown, Illust. Rec. Conch. Brit. p. 91, pi. 3G, 
fig. 10. 
Sub-triangular; sub-compressed ; beaks nearly central, con¬ 
siderably turned to one side, and acute, with a shallow ovate 
lunette under them ; striated longitudinally ; that portion of the 
valves rather concave ; cartilage side flat, with a large lanceo¬ 
late depression ; surface with flat, transverse, broad, reflected 
ribs. 
The Pleistocene Marine Formation, Inch Marnock, on tho 
Clyde; the Maimniferous Crag, Brammcrton ; and the Red 
and Coral Crags, Sutton. 
13. Venus ovata. —The Ovate Venus, pi. LXXXIII. fig. 14. 
V. ocata. Brown, Ill. Rec. Conch. Brit. p. 91, pi. 37, fig. 11. 
Sub-triangular; oblique; sub-compressed ; beaks nearly 
central, straight, and slightly indexed ; sides nearly equal; sur¬ 
face with rather strong, longitudiual, divergent ribs, crossed 
by fine transverso strise, producing a beautifully cancellated 
appearance. 
The Pleistoconc Marino Formation, Ireland; and the Red 
Crag, Sutton. 
14. Venus imbricata. — Tho Imbricated Venus, pi. 
LXXXVII. fig. 20. 
Astarte imbricata. Sowerby, VI. p. 37, pi. 521, fig. I. 
Cordiform ; orbicular; convex ; lunette elongated and flat; 
tooth in the left valve under tho lunette rather small ; hinge¬ 
line arcuated ; edge finely crenulated internally ; surface with 
from nine to eleven transverse imbricated ribs. 
The Red Crag, Sutton ; and Coralline Crag, Ramshot. 
15. Venus parallela.—T he Parallel Venus, pi.LXXXIII. 
figs. 3, 4. 
V. parallela. Phillips, Geo. York, II. p. 209, pi. 5, fig. 8. 
Transversely ovate, with sub-parallel sides; back gently 
sloping from tho beaks, which are small and pointed ; lunette 
lanceolate, and rather deep ; surface with delicate concentric 
furrows. 
The Carboniferous Limestone, Bolland. 
Genus XXX.—CYTHEREA.—Lamarck. 
Shell bivalve, equivalve, generally moro or less equilateral, 
or obtusely trigonal and transverso, or ovate ; smooth, or va¬ 
riously striated ; with threo or more short divergent cardinal 
teeth, and one anterior approximate lateral tooth in both 
valves, situate near tho primary teeth ; two remote lateral 
muscular impressions, united by a pallia! impression ; ligament 
external. 
1. Cytiierea incrassata.—T ho Thickened Cytherea, pi. 
LXXXIV. fig. 4. 
Venus incrassata. Sowerby, II. p. 12G, pi. 155, figs. 1, 2. 
Nearly orbicular ; slightly oblique; sub-compressed; smooth, 
with shallow’lines of growth; anterior sido a little concave 
under the beaks ; lunctto large, and not well defined ; internal 
margin entire. 
The Upper Marie, Islo of Wight. 
2. Cytherea parva.—T he Small Cytherea, pi. LXXXIV. 
fig. 20. 
Venus parva. Sowerby, VI. p. 32, pi. 518, figs. 4, 5, 6. 
Transversely obovate ; rather convex; beaks obtuse; sur¬ 
faco smooth; with remote shallow lines of growth ; lunette 
narrow. 
The Gault, Folkstono; and Ridgo, Wiltshire; and the 
Lower Greensand, Parham and Blaekdowm. 
3. Cytherea lineolata.—T he Lineatcd Cytherea. pi. 
LXXXIV. fig. 28. 
Venus lineolata. Sowerby, I. p. 57, pi. 20, upper figure. 
Transversely ovate, subcordate ; rather ventricose; anterior 
sido smooth ; the other portions covered wdth zig-zag strife ; 
beaks prominent; internal margin entire ; substance of the 
shell very thick. 
The Greensand, Blackdown. 
4. Cytherea convexa.— The Convex Cytherea, pi. 
LXXXIV. fig. 19. 
C. convexa . Brongniart, Env. do Paris, pi. 8, fig. 7. 
C. Scutellaria (?) Mantell, Geo. Suss. p. 263, pi. 25, fig. 2. 
