LePT/ENA. 
MOLLUSCA. 
125 
Hemispherical; hinge line equal in length to the diameter ; 
margin regular; lower valve regularly convex, but destitute of 
a mesial furrow; surface covered with unequally distributed, 
slender spines, with elongated bases; these are long, and in¬ 
curved outwards on the hinge line. 
Bolland; and South Petherwin, Devonshire. 
34. LEPTiENA lirata —The Ridged Lepta?na, pi. LV. 
fig. 5. 
Producta lirata. Phillips, Geo. York. II. p. 248, (Jim - 
briata , p. 215,) pi. 8, fig. 16. % 
Suborbicular; umbo very large, and produced; hinge line the 
entire width of the valves; larger valve with longitudinal sulci, 
and blunt ridges. 
Mountain Limestone, Moulton, and Isle of Man. 
35. Leptjena mesoloba. —The Middle-lobed Leptaena, 
pi. LV. fig. 15. 
Leptcena mesoloba ? Phillips, Pal. Fos. p. 61, pi. 25, fig. 102. 
Producta mesoloba , lb. Geo. York. II. p. 215, pi. 7> fig* 12, 13. 
Subovate; hinge line the whole breadth of the valves, which 
are wider than long; auricles obtusely angled; a mesial ridge 
on the convex valve, with a corresponding furrow on the other; 
surface smooth, or slightly wrinkled across. 
Mountain Limestone, Bolland; Derbyshire; and Codden 
Hill, North Devonshire; and Queen’s County, Ireland. 
36. Leptaena setosa. —The Bristled Leptaena, pi. LV. 
fig. 17* 
Producta setosa. Phillips, Geo. York. II. p. 214, pi. 8, fig. 
9 and 17. 
Semicircular; hinge line parallel, extending the whole width 
of the valves, prolonged into auriform processes; front fre¬ 
quently produced into a ridge; surface with strong, longitudinal 
striae, and very long, needle-shaped spines, set in quincunx 
order. 
Mountain Limestone, Rokeby and Northumberland. 
37* Leptaena muricata. —The Muricated Leptaena, pi. 
LV. fig. 16. 
Producta muricata . Phillips, Geo. York. II. p. 214, pi. 8, 
fig. 3. 
Nearly orbicular; umbo very large, and produced; hinge line 
the width of the valves; back somewhat flattened; surface with 
broad, strong, rounded, continuous ridges; with regular, blunt 
murications. 
Carboniferous Limestone, Kirby Lonsdale and Harelaw. 
38. LepT/BNA sulcata. —The Furrowed Leptaena, pi. 
LIII.* fig. 20. 
Productus sulcatus. Sowcrby, Min. Conch. IV. p. 17> pi* 
319, fig* 2. 
Semicylindrical, short, very convex above, with a mesial 
sulcus; hinge line as wide as the valves; whole surface with 
strong, spinose, longitudinal ridges. 
Mountain Limestone, Derbyshire. 
39* LEPTiENA Pectinoidea. —The Pecten-shaped Lep¬ 
taena, pi. LIII.* fig. 22. 
Producta pectinoides. Phillips, Geo. York. II. p. 215, pi. 
7, fig. 11. 
Orbicular; hinge line not so wide as the valves, terminating 
in distinct, auricular processes; umbo large, and prominent; 
whole surface covered with numerous, pretty strong, smooth, 
longitudinal ribs, which are furcated towards the base. 
Carboniferous Limestone, Bolland. 
40. Lept;ena nodulosa. —The Nodulous Leptaena, pi. 
LIII* fig. 21. 
Leptcena nodulosa. Phillips, Pal. Fos. p. 56, pi. 24, fig. 94. 
Somewhat semicircular, its width greatly exceeding its length; 
lower valve concentrically and irregularly angulated, and some¬ 
what nodulous near the border, where it is rectangularly 
reflected, and broadly undulated, its disk flat from the umbo 
to the border; surface with irregular, interrupted, concentric 
ridges and furrows; whole shell with very fine and numerous, 
close, flexuous, longitudinal striae. 
Devonian Limestone, Newton Bushel, and Hope, Torquay. 
41. Lept.ena Edelburc.ensis _The Addleburgh Lep¬ 
taena, pi. LIII.* fig. 27* 
Producta Edelburgensis. Phillips, Geo. York. II. p. 214, 
pi. 7, fig. 5. 
Semicircular; hinge line nearly parallel, and very wide; beak 
but slightly produced; deeper valve evenly convex; extreme 
sides compressed; whole surface with coarse, longitudinal striae, 
which is frequently duplicate; spines few, or none. 
Nearly allied to L. latissima , but differs in its flattened ears. 
Carboniferous Limestone, Addlesburgh; Fountains’ Fell; and 
Bolland. 
42. Lept;ena costata —The Ribbed Leptaena, pi. LIII.* 
fig. 15. 
Producta costata. Sow'erby, Min. Conch. VI. p. 115, pi. 
560, fig. 1. Phillips, Geo. York. II. p. 213, pi. 7, fig. 2. 
Transversely elongated; convex valve with a deep, triangular, 
mesial furrow, and broad, rounded, longitudinal ribs, which are 
decussated above by rather strong, concentric furrows, and 
compressed at the base, which is deflected, the intervening 
furrows narrow, and deep; each side provided with two or three 
spines, and a small lobe. 
Carboniferous Limestone, Glasgow; Bolland; Richmond, 
Yorkshire; and Hawes. 
43. Leptjena antiquata —The Antiquated Leptaena, pi. 
LV. fig. 11. 
Productus antiquatus. Sowerby, Min. Conch. IV. p. 15, pi. 
317, fig* 1, 5, 6. Phillips, Geo. York. II. p. 213, pi. 7, fig* 3. 
Anomites semistriatus , Martin, Pet. Derb. pi. 32 and 33, fig. 
1, 2, 3, 4. 
Semicylindrical, or quadrato-hemispherical; hinge line some¬ 
what shorter than the width of the shell, terminating in auriform 
processes; sides nearly parallel; umbo extremely large, and 
produced; larger valve very much inflated ; lesser valve nearly 
flat; mesial furrow' wide; whole surface with rounded, radiating 
ribs, reticulated at the umbo by concentric undulations, which 
are larger, fewer, and more spinose towards the auricles. 
Young shells are plano-convex, with fine longitudinal and transverse 
stria;. 
Carboniferous Limestone, Bolland; Coverdale; Northumber¬ 
land ; Derbyshire; Flintshire; and Kildare, Ireland. 
44. Leptjena pugilis. —The Fighting Leptaena, pi. LIII.* 
fig. 13. 
Producta pugilis. Phillips, Geo. York. II. p. 215, pi. 8, 
fig. 6. 
Semicircular; hinge line as wide as the shell, and terminating 
in acute, spinous, auricular processes; umbo large, and much 
produced; whole surface with numerous, equal, strong, radiating 
2 i 
