38 
MOLLUSCA. 
Bellerophon, 
2. B. tenufascia. — The Thin-banded Bellerophon, 
pi. XXVI. figs. 16 and 30. 
B. tenufascia . Sowerby, Min. Conch. V. p. 109, pi. 170, 
figs. 2 and 3. Phillips, Geo. of Yorkshire, II. p. 230, pi. 17, 
figs. 9, 10. Nautilus hiulcus Var. c. Martin, Petrefactions of 
Derbyshire Systematically Arranged, p. 15. 
Nearly globular ; aperture widely expanded ; mesial keel 
thin, elevated, and acute, with fine, close, transverse striae ; 
umbilicus small ; greatest diameter three inches. 
Found at Scalebar, Derbyshire ; at Settle, Yorkshire ; also 
near Kendal, and at Bolland, Queen’s County, Ireland. 
3. B .VVoodwa RDir.—Woodward’s Bellerophon, pi. XXVI. 
figs. 14, 20, and pi. XXIIT. fig. 12, p. 34, No. 20. 
Bellerophon Wood war dii. Phillips, Geology of Yorkshire, 
II. p. 231, pi. 17, figs. 1, 2, 3. 
Discoidal, lenticular, subrhomboidal, with four or five 
rapidly increasing volutions; sides angular; whole surface 
covered with many concentric series of granulated lines ; 
back rounded, and furnished with a linear sulcus in its 
centre ; aperture obovate, with angulated sides. 
In old shells, the series of beaded lines assume the appear¬ 
ance of ordinary striae, and the inner volutions become some¬ 
what concealed. 
Found at Bolland, Queen’s County, and Kulkeah, Ireland. 
4. B. hiulcus. — The Gaping Bellerophon, pi. XXVI. 
figs. 17, 19- 
Bellerophon hiulcus. Sowerby, Min. Conch. V. p. 109, 
pi. 470, fig. 1. Deshayes, Des.de Coq. Car. dcs Terr. p. 133, 
pi. 8, fig. 1, 2. Ency. Method. II. p. 133, No. 1. Brown’s 
Elements of Fossil Conchology, pi. II. fig. 15. Fleming, 
Brit. An. p. 338. Conchyliolithus Nautilus hiulcus, Martin, 
Pet. Derb. pi. 40, fig. 1. Syst. Arrangements, pi. 1. fig. 6. 
Globose, expanding widely from the central volutions ; 
mesial keel broad and flat ; axis perforated ; the sides 
covered with close-set, elevated stria?, which emanate from 
the axis, and pass obliquely to the keel; the front sinus is 
deep, and producing arcuated striae upon the carina, whose 
sides are well defined by sharp, depressed lines ; aperture 
much expanding. 
Found in the Carboniferous Limestone of Derbyshire ; and 
at Bolland, Queen’s County, Ireland. 
5. B. costatus _The Ribbed Bellerophon, pi. XXVI. 
fig. 24. 
Bellerophon costatus. Sowerby, Min. Conch. V. p. 110, 
pi. 470, fig. 4. Parkinson, Organic Remains, III. p. 141, 
pi. 10, fig. 6. Fleming, Brit. An. p. 338. Phillips, Geo. of 
Yorkshire, II. p. 230, pi. 17, fig. 15. Conch. Nautilus 
hiulcus, Martin, Pet. Derby, p. 15, pi. 11, fig. 1. 
Subglobose, with a small rounded umbilicus ; mesial keel 
broad, somewhat depressed ; striae sharp, emanating from the 
umbilicus in an arcuated form, and terminating in a deep 
V-shaped dorsal sinus; aperture large and expanding. 
Found in the Limestone of Craven ; and Bolland, Queen’s 
County, Ireland. 
6. B. sulcatus. —The Furrowed Bellerophon, pi. XXVI. 
figs. 23, 26. 
Discoidal, with a large and shallow umbilicus ; sides some¬ 
what inflated, and crossed by numerous, narrow, curved 
sulci; mesial keel elevated, with arcuated sulci, which arc 
continuous with those of the sides ; aperture considerably 
expanded and arcuated, and much elevated behind. 
Found at Bolland, Queen’s County, Ireland. 
7. B. expansa. — The Expanded Bellerophon, pi. XXVI. 
fig. 29. 
Subdiscoidal; umbilicus concealed ; sides greatly produced, 
and crossed by wide-set sulci, which are carried over the 
somewhat elevated mesial keel, in an arcuated form ; aper¬ 
ture very wide and gaping. 
This species is nearly allied to B. apertus in form, but is 
at once distinguished by its having a dorsal keel. 
Found at Bolland, Queen’s County, Ireland. 
8. B. decussatus. — The Decussated Bellerophon, pi. 
XXVI. fig. 21. 
Bellerophon decussatus. Fleming, Brit. An. p. 338. 
Phillips, Geo. of Yorkshire, II. p. 231, pi. 17, fig. 13.^ 
Subglobose, or somewhat longitudinally ovate, covered by 
small spiral ridges and furrows, which are crossed by finer 
thread-like, arcuated lines, producing a beautifully decussated 
appearance, which, at their point of junction, are somewhat 
acute, giving the surface a subtuberculated aspect; aperture 
very much expanded ; axis solid ; mesial keel tumid and 
rounded, and covered by the striae. 
Found in the Clay Slate of the Coal Formation, Linlith¬ 
gowshire, and at Kulkeagh, Ireland. 
SECTION II.-SHELLS DESTITUTE OF A MESIAL CARINA. 
9- B. Urii. —Ures Bellerophon, pi. XXVI. figs. 13, 15. 
Bellerophon Urii. Fleming, Brit. An. p. 338. Phillips, 
Geo. of Yorkshire, II. p. 231, pi. 17, figs. 11, 12. Nautilus , 
Ure’s Rutherglen, See. p. 308, pi. 14, fig. 9* 
Globular; sides of the aperture much expanded ; axis 
solid ; shell smooth, with many regular, spiral, shallow fur¬ 
rows, and rounded, narrow ridges ; destitute of a keel. 
The cast of the interior of this fossil is smooth. 
Found in the Carboniferous Limestone of Rutherglen, 
Renfrewshire; Bowes; Bolland ; Harelaw, and Linlithgow¬ 
shire. 
10. B. spiralis. — The Spirally-Furrowed Bellerophon, 
pi. XXVI. fig. 18. 
Bellerophon spiralis. Phillips, Geo. of Yorkshire, II* 
p. 231, pi. 17, fig. 8. 
Ovate, largely umbilicate ; the back and edges of the 
umbilicus obtusely angled, with numerous spiral ridges and 
sulci; the whole surface being very minutely granular, and 
only visible by the aid of a strong lens ; lip of the aperture 
somewhat triangularly pointed behind. 
Found at Bowes ; Otterburn, and Harelaw. 
11. B. apertus. —The Open Bellerophon, pi. XXVI. 
figs. 25, 27. 
Bellerophon apertus. Sowerby, Min. Conch. V. p. 108, 
pi. 469, fig- 1* Fleming, Brit. An. p. 338. Phillips, Geo. 
of Yorkshire, II. p. 231, pi. 27, fig. 4. 
Nearly spherical ; inner volutions concealed ; axis solid 
and very thick ; sides smooth ; sides of the aperture conside¬ 
rably expanded, and its extremities rather square; destitute 
of a mesial keel; back rather rounded. 
Found in the Limestone at Carlingford, county of Lowth, 
and met with in the same formation at Harelaw and Otter- 
burn ; at Kirby Lonsdale; Bristol; and Settle, Yorkshire ; 
from which last locality, they are sometimes met with nearly 
four inches in diameter. 
