Modiola. 
CONCH1FERA. 
J7;j 
and are lost near the beaks; depth of the united valves ex¬ 
ceeding the length of the shell. 
The Lower Greensand, Ilythe. 
14. Modiola minima. —The Small Modiola, pi. LXXII. 
fig. 28. 
M. minima. Sowerby, III. p. 19, pi. 210, figs. 5, 0, 7. 
Sub-triangularly ovate, its width one and a-half its length ; 
sides nearly rounded, broad anteriorly; posterior lobe small, 
distinct; front nearly straight; beaks small. The margin 
forming a prominent angle with the hinge-lino at their junction ; 
surface smooth. 
The Lias, north of Shropshire, and Vale of Gloucester. 
15. Modiola gibbo.sa. —The Gibbous Modiola, pi. LXXII. 
figs. 5, 0. 
M. gibbosa- Sowerby, 111. p. 19, pi. 211, fig. 1. 
Transversely elongated; reniforra, very gibboso ; its width 
double its length ; depth of each valve nearly equal to the 
length ; back broad, arcuated ; posterior lobe well defined 
and inflated; surface smooth. 
Great Oolite, AnclifF and Bradford, and the Inferior Oolite, 
Cots wold Ilills. 
1G. Modiola reniformis. —The Kidney-shaped Modiola, 
pi. LXXII. figs. 32, 33. 
M. reniformis. Sowerby, III. p. 20, pi. 211, fig. 3. 
Transversoly-oblong, sub-reniform ; its width not twice its 
length ; anterior lobe considerably expanded and pointed ; pos¬ 
terior lobe small; surface smooth ; centre of the front consider¬ 
ably indented. 
The Inferior Oolite, near Bath. 
17. Modiola sub-carinata. —The Sub-oarinated Modiola, 
pi. LXXII. figs. 21, 22. 
M. sub-carinata , (?) Sowerby, III. p. 17, pi. 210, fig. 1. 
Lamarck, Foss. de. Paris, p. 191 ; Ann. du Mus. VI. p. 122, 
and IX. pi. 17, fig. 10. 
Transvorsely-oblong; its width double its length; front 
arcuated ; anterior side keel-shaped; posterior lobe convex 
and rather obtuse ; surface smooth, with well-defined lines of 
growth. 
The London Clay, Ilighgatc. 
18. Modiola bipartita. —The Two-parted Modiola, pi. 
LXXII. figs. 9, 10, and pi. LXXI. figs. 22, 23. 
M. bipartita. Sowerby, III. p. 17, pi. 210, figs. 3, 4. 
Transversely elongated ; its width more than twicoand a- 
half its length; somewhat gibbose and smooth ; anterior side 
obtuse, abruptly raised above the posterior; the posterior lobe 
irregular ; beak sub-carinated ; front waved. 
19. Modiola .equalis.—T he Equal Modiola, pi. LXXII. 
fig. 35. 
M. wqualis. Sowerby, III. p. 18, pi. 210, fig. 2. 
Transversely oblong, convex, smooth ; anterior lobe ob¬ 
scurely defined; front nearly parallel ; width not quite twice 
its length. 
The Lower Greensand, Parham, Sussex. 
20. Modiola lineata. —The Lineated Modiola,pi. LXXII. 
figs. 1, 2. 
M. lineata. Sowerby, Geo. Tr. 2d Ser. IV. p. 338, pi. 14, 
fig. 2. 
Elongated, vcntricose, arcuated; beaks obtuse ; margins 
arched, and nearly parallel; depth of each valve equal to its 
width ; surface covered with fine regular striae, diverging from 
the beaks to the opposite extremity, crossed by remote lines 
of growth. 
The Lower Greensand, near Ilythe. 
21. Modiola bella. —The Neat Modiola, LXXII. fig. 3. 
M. bella. Sowerby, Geo. Tr. 2d Series, IV. p. 338, pi. 11, 
fig. 9. 
Ovate, convex; beaks obtuse; edges parallel; surface 
smooth, with fine distinct striae ; sides nearly equal. 
The Lower Greensand, Ilythe and West of Sussex. 
22. Modiola producta. —The Produced Modiola, pi. 
LXXII. figs. 11, 12. 
M. producta. Williamson's MSS. and in his Collection. 
Elongated, moderately inflated, somewhat arcuated ; beaks 
obtuse; side under the hinge- line much produced; surface 
smooth ; lines of growth slightly defined. 
The Coal Shale, Wakefield. 
23. Modiola si b-truncata. —The Sub-truncateu Modiola, 
pi. LXXII. figs. 15, 1G. 
M. gracilis. Williamson's MSS. and in his Collection. 
Sub-quadrangular; beaks hardly protruding; hinge-line 
much lengthened, and nearly straight, and obliquely sloping 
downwards from the extreme angles ; surface smooth. 
The Coal Shale, Wakefield. 
24. Modiola curtata. —The Cut-off Modiola, pi. LXXII. 
figs. 19, 20. 
M. Curtata. Williamson’s MSS. and in his Collection. 
Oblong ; beaks small and flat; anterior side short, rounded ; 
posterior sido large, with a considerable expansion above, and 
the extremity truncated ; surface smooth, with some nearly 
obsolete lines of growth. » 
The Coal Shale, Wakefield. $ 
25. Modiola flexuosa. —The Flexuous Modiola, pi. 
LXXII. fig. 18. 
Elongated; anterior side narrow and short; beaks obtuse ; 
basal-line nearly straight, and lengthened from the anterior side, 
with a flexure below it; surface smooth, with remote, shallow 
lines of growth ; side below the beaks flexuous on the edge. 
In the Cabinet of Thomas Allis, Esq. York. 
The Maidstone, Gloucestershire, in the lower bed of the 
Oolitic Series. 
2G. Modiola Robertsoni. —Robertsons Modiola, pi. 
LXXII. figs. 24, 25. 
Cabinet of Mr Robertson, Newcastle-on-Tyne. 
Elongated, considerably inflated; beaks sub-central, very 
obtuse, and rounded ; hinge-line short, with an expansion near 
it; surface smooth, with remote shallow lines of growth. 
The Coal Shale, Newcastle Coal-field. 
2?. Modiola re versa. —The Reverse Modiola, pi. LXXII. 
fig. 23. 
M. reversa. Sowerby, Geo. Tr. 2d Series, IV. p. 342. pi. 
17, fig. 13. 
Transversely elongated, rather compressed; anterior side 
narrow, short; umbones obtuse; posterior side considerably 
expanded; surface with narrow, very regular, concentric 
ridges, which are reflected upon the surface. 
The Greensand, Blackdowu. 
28. Modiola Moorei. — Moore’s Modiola, pi. LXXII. f. 27. 
M. Moorei. Brown, Man. Geo. Tr. I. p. 227, pi. 7, fig. 74. 
