124 
MOLLUSCA. 
Leptaena. 
23. Lepton A margaritacea. —The Pearly Leptaena, pi. 
LI 11.* fig. 5. 
Producta margaritacea . Phillips, Geo. York. II. p. 215, 
pi. 8, fig. 8. 
Suborbicular, very much inflated; hinge line nearly parallel; 
beaks very large, and prominent; ears rounded; with numerous, 
rounded, smooth, radiating stria.'; with two or three spines on 
the ears, and also on the sides. 
Mountain Limestone, Florence Court. 
24. LeptjENA Scotica —The Scottish Leptaena, pi. LIII.* 
fig. 8, 9. 
Productus Scoticus . Sowerby, Min. Conch. I. p. 158, pi. 
69, fig. 3. 
Semicircular; hinge line parallel, as long as the valve; umbo 
of larger valve large, and prominent; both valves gibbous 
towards the beaks; sides expanded; convex valve with the 
divergent striae interrupted by nearly obsolete spines, and short 
intervening striae, and remote, nearly parallel lines of growth, 
which produce irregular undulations, more especially towards 
the sides; middle somewhat depressed; shallow valve with 
divergent striae, but devoid of the spines. 
Carboniferous Limestone, Linlithgow and Arran, Scotland ; K 
and Cork, Ireland. 
25. Leptvena spinosa—T he Spinous Leptaena, pi. LIII* 
fig. 11. 
Productus spinosus. Sowerby, Min. Conch. I. p. 157, pi. 
69, fig. 2. 
Suborbicular, gibbous, a little wider than long; hinge line 
short ; convex valve with many elongated, cylindrical spines, 
bending towards the front; concave valve destitute of spines; 
whole surface with numerous, longitudinal striae. 
Carboniferous Limestone, Linlithgow and Arran. 
26. LePT/ENa aurita —The Eared Leptaena, pi. LV. fig. 
1 and 10. 
Producta aurita. Phillips, Geo. York. II. p. 214, pi. 7, fig. 
6, 7- 
Hemispherical; sides prolonged into prominent, rounded, 
rugose ears, which are angular in the young condition ; surface 
with obtuse, radiating striae, and a few remote lines of growth. 
Mountain Limestone, Ulverston, Holland, and Kendal; and 
Queen’s County, Ireland. 
27. Lept/ENa scabricula —The Rough Leptaena, pi. 
LV. fig. 2, 3. 
Productus scabriculus. Sowerby, Min. Conch. I. p. 157, pi. 
69, fig. 1. Phillips, Geo. York. II. p. 214, pi. 8, fig. 2, and pi. 
8, fig. 20 ? Ib. Pal. Fos. p. 58, pi. 24, fig. 97. Anomites 
scabriculus , Martin, Pet. Derb. pi. 36, fig. 5. 
Nearly orbicular; hinge line parallel, and equal to the breadth 
of the shell; sides rather straight, producing a somewhat quad¬ 
rangular appearance; beak large, and prominent; smaller valve 
flat, with obscurely punctated, radiating striae, the remains of 
the spines producing a concentric, reticulated appearance; larger 
valve with longitudinal, elongated, prominent, tuberculated, 
sharp pointed striae, set in nearly quincunx order; mesial furrow 
broad. 
Mountain Limestone, Derbyshire, Bristol, Bowes, Coalbrook- 
dalc, Harelaw, Pilton, and Brushford. 
28. Leptjcna concinna.—T he Neat Leptaena, pi. LV 
fig. 4. 
Productus concinnus. Sowerby, Min. Conch. IV. p. 16, pi. 
318, fig. 1. Phillips, Geo. York. II. p. 214, pi. 7, fig. 9. 
Semicylindrical; smaller valve concave, and deeply inserted ; 
larger one convex, concave along the middle; neatly striated, 
and spined longitudinally; general surface smooth, and po¬ 
lished. 
Somewhat resembling L. Martini , but smaller and smoother. 
Carboniferous Limestone, Derbyshire; Richmond and Bol- 
land, Yorkshire; and Cork. 
29. Leptasna quincuncialis —The Squarish Leptaena, 
pi. LV. fig. 7. 
Leptama quincuncialis . Phillips, Geo. York. II. p. 214, pi. 
7, fig. 8. 
Suborbicular; cardinal area flat; hinge line not so wide as 
the valves; beak large, and prominent; sides rounded; surface 
with strong, longitudinal ribs, alternately elevated into oblong 
tubercles, and intersected by remote, nearly equidistant lines 
of growth. 
Mountain Limestone, Bolland. 
30. Leptjena pustulosa —The Pustulous Leptasna, pi. 
LV. fig. 2. 
Leptaena qwstulosa. Phillips, Geo. York. II. p. 216, pi. 7, 
fig. 16. 
Nearly orbicular, but inclining to quadrate, much inflated, 
with transverse, shallow furrow r s; hinge line not so wide as the 
valves; beak prominent, and acute; surface with some scattered 
pustule-like, flat tubercles, which become more and more ad- 
pressed towards the margins; ears angular, furrowed, but des¬ 
titute of spines. 
31. Leptaena spinulosa _The Prickly Leptaena, pi. LV. 
fig. 6. 
Productus spinulosus. Sowerby, Min. Conch. I. p. 155, pi. 
68, fig. 3. Phillips, Geo. York. II. p. 216, pi. 7, fig. 14. 
Semicircular, compressed; hinge line the whole width of the 
valves; convex valve inflated towards the beak, which is large, 
and produced, with numerous, short spines, arranged in quin¬ 
cunx order; lesser valve concave, and spinous; the whole sur¬ 
face longitudinally striate. 
Carboniferous Limestone, Linlithgow*, Bolland, and Walsing- 
ham. 
32. Leptjena Martini.— Martin’s Leptaena, pi. LV. fig. 
9 and 19. 
Productus Martini. Sowerby, Min. Conch. IV. p. 15, pi. 
317, fig. 2, 3, 4. Phillips, Geo. York. II. p 213, pi. 7, fig. 1, 
and pi. 8, fig. 19. Anojnites productus, Martin, Pet. Derb. pi. 
22, fig. 1, 2, 3. 
Semicylindrical; hinge line two-thirds the width of the valves, 
and produced; umbo very much inflated; with a flattened base, 
and numerous, thread-like, longitudinal, spinous striae, which in 
some specimens are furcated towards the base; lesser valve 
nearly flat, and deeply inserted; auricles distinct, with two rows 
of spines. 
Mountain Limestone, Castleton, Derbyshire; Bolland; High- 
Green-Wood; Kirby Lonsdale; Hudsewell; Harrowgate; and 
Northumberland; and Arran, Scotland. 
33. Leptasna laxispina. —The Wide-spined Leptaena, pi. 
LV. fig. 16. 
Producta rarispina. Phillips, Geo. York. p. 248, {Jim- 
briata? p. 215.) Ib. Pal. Fos. p. 59, pi. 25, fig. 29. 
