Nucula. 
CONCHIFERA. 
187 
terior side elongated and rounded; beaks very obtuse ; surface 
smooth. 
The Spceton Clay, Speeton, Yorkshire. 
30. Nucula accipiens. —The Admitted Nucula, pi. LXXYI. 
figs. 56, 57. 
A', accipiens . Sowerby, Geo. Tran. 2d. Ser. Y. pi. 39, f. 4. 
Transversely elongated ; oblong-oval; much compressed ; an¬ 
terior side rounded ; posterior side truncated; boaks nearly 
central ; surface with fine, regular, concentric strife. 
The Coal Measures, Coalbrook Dale, Staffordshire. 
37. Nucula acuta. —The Acute Nucula, pi. LXXVI. fig. 
58. 
iY. acuta. Sowerby, Geo. Trans. 2d. Ser. Y. p. 039, fig. 5. 
Transversely oblong, convex; anterior side rounded; pos¬ 
terior side acuminated, and terminating in a sharp point; 
beaks rather acute, and sub-central; surface with fiuo con¬ 
centric strife. 
The Coal Measures, Coalbrook Dale. 
38. Nucula ^equalis. —The Equal Nucula, pi. LXXYI. 
fig. 59. 
N. wqualis. Sowerby, Geo. Tr. 2d Ser. Y. pi. 39, fig. 3. 
Transversely sub-ovate; convex ; anterior side short, round¬ 
ed ; posterior side separated by a ridge and truncated ; beaks 
situate nearest the anterior side ; surface with numerous fine 
concentric ridges. 
The Coal Measures, Coalbrook Dale, Staffordshire. 
39. Nucula attenuata. —The Attenuated Nucula, pi. 
LXXYI. fig. 70. 
JV. attenuata. Fleming, Brit. An. p. 403. Ure, Ilist. 
Ruthcrglen, &c. pi. 15, fig. 5. 
Transversely elongated, greatly arcuated, ventricose; an¬ 
terior side short, obliquely truncated ; posterior side much 
elongated and attenuated, terminating in a blunted point; 
hinge area wide and very coucave ; beaks much produced, a 
little incurved; surface with fine, delicate, transverse stria) ; 
base much arcuated. 
Coal Shale, Renfrewshire. 
40. Nucula brevirostra. —The Short-beaked Nucula, 
pi. LXXYI. fig. 74. 
N* brevirostra . Phillips, Geo. York, II. p. 210, pi. 5, 
fig. 11a. 
Ovate, anterior side short and attenuated; posterior side 
largo and rounded ; beaks short; surface with fine concentric 
stria); back and base equally curved. 
The Carboniferous Limestone, Harelaw, Northumberland. 
41. Nucula longirostra. —The Long-billed Nucula, pi. 
LXXYI. figs. 68, 69. 
N. claviforrnis. Phillips, Geo. York, II. p. 210, pi. 5, 
fig. 17 a. 
Claviform, much elongated, transversely convex ; anterior 
side rounded ; posterior side lengthened, and rapidly attenu¬ 
ated, with the termination acute; beaks short, a little incurv¬ 
ed ; basal line ascending abruptly from the point opposite 
the beaks. 
The Carboniferous Limestone, Harelaw and Otterburn, 
Northumberland. 
42. Nucula gibbosa. —The Tumid Nucula, pi. LXXVI. 
fig. 79. 
N. gibbosa. Fleming, Brit. An. p. 403. Ure, Ruthcrglen, 
p. 310, pi. 15, fig. 6 . Phillips, Geo. York, II. p. 210, pi. 5 , 
fig. 15. 
Transversely ovate, ventricose; anterior side short; poste¬ 
rior longer and rounded ; beaks obtuse and incurved ; surface 
with shallow remote lines of growth. 
'flic Coal Shale, Renfrewshire. 
43. Nucula luciniformis. —The Lucina-formed Nucula, 
pi. LXXYI. figs. 80, 81. 
N. luciniformis. Phillips, Geo. York, II. p. 210 , pi. 5 , 
fig. 1 1 . 
Obliquely ovate ; inflated ; smooth ; anterior side rounded ; 
posterior side obliquely truncated, with some narrow stria); 
base considerably arcuated. 
The Carboniferous Limestone, Bolland. 
44. Nucula cuneata. —The Wedge-shaped Nucula, pi. 
LXXYI. fig. 72. 
N. cuneata. Phillips, Geo. York, II. p. 210 , pi. 5 , fig. 14. 
Transversely elongated ; wedge-shaped ; beaks obtuse, situ¬ 
ate near the anterior end; hinge-line straight, and extending 
nearly the whole breadth of the shell; anterior end narrow, 
and increasing in breadth towards the other extremity, which 
is rounded ; surface with a few remote, radiating strife, and 
concentric lines of growth. 
The Carboniferous Limestone, Bolland. 
45. Nuctjla Bowerbankii. —Bowerbank’s Nucula, pi. 
LXXYI. figs. 82, 83. 
N. Bowerbankii. Sowerby, Geo. Tr. 2 d Ser. Y. p. 136, pi. 
8 , fig. 11 . 
Sub-elliptical, convex; anterior side obliquely truncated, 
with a nearly fiat, pointed lunette, occupying the whole side ; 
posterior side rounded; external surface smooth, striated in¬ 
ternally ; edge toothed; impressions of the obductor muscles 
shallow. 
The London Clay, Hampstead Heath. 
46. Nucula Wetherellii. —Wetherell’s Nucula, pi. 
LXXYI. figs. 76 , 77. 
N. Wetherellii. Sowerby, Geo. Tr. 2 d Ser. Y. p. 136, pi. 
8 , fig. 12 . 
Nearly orbicular; gibbose; smooth; both sides slightly 
pointed; beaks small, nearly central; hinge-line triangular; 
margin crcnulatcd. 
The London Clay, Hampstead Heath. 
47. Nucula compressa. —The Compressed Nucula, pi. 
LXXVI. figs. 63, 04. 
N. compressa. Sowerby, Geo. Tr. 2 d Ser. Y. p. 136, pi. 8 , 
fig. 14. 
Sub-ovate, smooth; compressed; anterior side rather short, 
contracted, and a little pointed; posterior side large and 
rounded ; base arcuated ; destitute of a lunette. 
The London Clay, Hampstead Heath. 
48. Nucula striata. —The Striated Nucula, pi. LXXYI. 
figs. 60, 61. 
N. striata. Variety, Sowerby, Goo. Tr. 2 d Ser. V. p. 136, 
pi. S. fig. La. 
Transversely elliptical; anterior side rather short, and a 
little pointed; posterior side rounded, acute above ; hinge-line 
straight; external surface with very fine concentric stria*. 
The London Clay, Hampstead Heath. 
49. Nucula nuda. —The Bare Nucula, pi. LXXVI. f. 75. 
