L (JOIN A. 
CONC11IFERA. 
215 
G enus XL.—LUCIXA.— Bruguierc. 
Shell equivalve, inequilateral, usually orbicular, lenticular, 
and sub-depressed ; teeth variable, most commonly two minute 
cardinal teeth divergent from the umbo, frequently nearly ob¬ 
solete ; in one valve one lateral tooth on each side of the 
umbo, and two on each side in the other ; the anterior lateral 
ones being situate near the primary teeth, and the posterior 
immediately behind the ligament; two muscular impressions 
remote from each other, the anterior one generally extruded 
backwards and downwards in the form of an elongated band ; 
pallial impression destitute of a sinus; ligament external, 
elongated, and partly hidden by the inflected margins of the 
valves when closed, consequently, the internal tendinous por¬ 
tion is frequently sunk into a deep, elongated cavity, situato 
between the teeth and hinge margin. 
1 . Lucina despecta. —The Despised Lucina, pi. LXXXIX. 
fig. 5. 
L. despectus. Phillips, Geo. York, I. pi. 9, fig. 8. 
Nearly orbicular; beaks large and obtuse; anterior side a 
little smaller than the posterior; surface smooth, with remote 
lines of growth. 
The Great Oolite, Cloughton AVyke, and the Inferior 
Oolite, Blue Wick. 
2. Lucina lirata. 
L. lirata. Phillips, Geo. York, pi. 0, fig. 11. 
Sub-orbicular, anterior side short, the line from the apex 
being very slightly bent; a longitudinal furrow close to the side 
liue; posterior side rounded; surface with many concentric, 
narrow furrows, nearly straight, in the centre of the valves, 
and turning abruptly up at both ends, those in the posterior 
side bounded by the furrow. 
The Kelloways Rock, Scarborough. 
3. Lucina Goodiiallii. —Goodhalls Lucina,pi.LXXXIX. 
figs. 1, 2, 3. 
L. Goodkallii. Sowerby, Geo. Tr. 2d Scr. Y. p. 13G, pi. 
8, fig. 6. 
Sub-globose; anterior side concave, posteriorly rounded; 
lunette broad, flat, and rather deeply sunk, meeting near the 
edge, with a broad and a narrow groove on each side of it; 
surface nearly smooth. 
The Loudon Clay, Uighgate and Shoppy. 
4. Lucina globosa. —The Globular Lucina,p 1. LXXXIX. 
fig. 17. 
L. globosa. Sowerby, Geo. Tr. 2d Ser. IY. p. 335, pi. 11, 
fig. 2. 
Nearly globular, anterior side straight for a short distance 
bolow the beak; posteriorly with a long flattened space; 
beaks sub-acute ; base much arcuated; surface smooth, with 
some shallow lines of growth, which are peculiarly waved near 
the posterior margin. 
The Upper Greensand, Kent and Sussex. 
5. Lucina mites. —The Gentle Lucina, pi. LXXXIX. 
fig. 16. 
L. mites. Sowerby, VI. p. 107, pi. 557, fig. 1. 
Circular, convex ; lunette oval, and very deep; surface 
covered with minute, longitudiual, numerous stria), crossed by 
very regular lamina); cardinal teeth obscure, and destitute of 
a lateral tooth ; inside rough, but not punctated like many of 
its congeners. 
The London Clay, Barton and Uighgate. 
G. Lucina gigantea. —The Gigantic Lucina, pi. LXXXIX. 
fig. 33. 
L. gigantea. Dcshayes, Coq. Foss. p. 91, pi. 15, fs. 11, 12. 
Very broad, smooth, sometimes sub-striated, and internally 
punctated ; hinge toothless, umbones large ; length frequently 
upwards of three inches and a-half; breadth three inches and 
three quarters. 
Tho London Clay, Barton. 
7. Lucina divauicata. —The Divergent Lucina, pi. 
LXXXIX. fig. 25. 
L. divaricata. Lamarck, Env. de Paris, p. 244, Sowerby, 
Y. p. 18, pi. 417. 
Circular, gibbose; surface with two sets of arcuated, ob¬ 
lique, convergent stria), crossed by three or four deep, well- 
marked lines of growth ; inside dull, and a little granulated ; 
substance of the shell thick. 
The Mammiforous Crag, Bramerton, and the Red Crag, 
Sutton and Barton. 
8. Lucina radula. —The Rasp Lucina, pi. LXXXIX. 
fig. 19. 
L. radula. Brown's Ulust. Conch. Brit, and Ireland. L. 
antiquata. Sowerby, YI. p. 108, pi. 557, fig. 2. 
Circular, convex; lunette lanceolate, flat; surface with 
many irregular, concentric, sharp lamina); anterior side an¬ 
gular ; substance of tho shell moderately thick. 
The Red Crag, Sutton and Ramshot; Mammiferous Crag, 
Thorpe. 
- 9. Lucina crass a.— The Thick Lucina, pi. LXXXIX. 
figs. 9, 10. 
L. crassa. Sowerby, YI. p. 108, pi. 557, fig. 3. 
Nearly circular, somewhat broader than long; convex ; 
beaks very small, superior margin obtuse ; lunette linear, 
sunk ; surface with slightly elevated, concentric laminae; 
valves thick. 
Tho Calcareous Grit, Cloughton Wykc, Yorkshire. 
10. Lucina orbicularis. —The Orbicular Lucina, pi. 
LXXXIX. figs. 11, 12. 
L. orbicularis. Sowerby, Geo. Tr. 2d Ser. p. 341, pi. 1G, 
fig. 13. 
Nearly orbicular; a little elongated ; convex; beaks email, 
central, remote ; sides equal ; surface with numerous, divergent, 
longitudinal, frequently forked stria), and a few distant lines 
of growth. 
The Greensand, Blackdown. 
11. Lucina pisum. —Tho Pea Lucina, pi. LXXXIX. fig. 13. 
L. pisum. Sowerby, Geo. Trans. 2d Ser. IY. p. 341, pi. 
1G, fig. 14. 
Nearly orbicular; beaks obtuse; surface with fifteen or 
more concentric, reflected ridges. 
The Greensand, Blackdown. 
12. Lucina Portlandica.—T ho Portland Lucina, pi. 
LXXXIX. fig. 15. 
L. Portlandica. Sowerby, Geo. Tr. 2d Ser. p. 347, pi. 22, 
fig. 12. 
Orbicular, compressed ; beaks nearly central aud small; sides 
equal; surface with fine, very regular, concentric striie. 
