88 



MOLLUSCA. 



Bellerophon, 



2. B. TENUFASCiA.^ — The Thin-banded Bellerophon, 

 pi. XXVI. figs. 16 and 30. 



B. tenvfascia. Sowerb.y, Min. Conch. V. p. 109, pi. 170, 

 figs. 2 and 3. Phillips, Geo. of Yorkshire, II. p. 230, pi. 17, 

 figs. 9, 10. Nautilus hhdcus Var. c. Martin, Petrefactions of 

 Derbyshire Systematically Arranged, p. 15. 



Nearly globular ; aperture widely expanded ; mesial keel 

 tiiin, 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 .WooDWAUDii. — Woodward's Bellerophon, pi. XXVI. 

 figs. 14, 20, and pi. XXIII. fig. 12, p. 34, No. 20. 



Bellerophon Woodwardii. 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 linos assume the appear- 

 ance of ordinary strias, 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. 0. 



Globose, expanding widely from the central volu-tions ; 

 mesial keel broad and flat ; axis perforated ; the sides 

 covered with close-set, elevated strioe, 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. 



Fouiid in the Carboniferous Limestone of Derbyshire ; and 

 at Bolland, Queen's County, Ireland. 



5. B, cosTATUs The Ribbed Bellerophon, pi. XXVI. 



fig. 24. 



Bellerophon coslatus. Sowerby, Min. Conch. V. p. 110, 

 pi. 470, fig. 4. Parkinson, Organic Remains, III. p. 141, 

 pi. 10, fig. G. Fleming, Brit. An. p. 338. Phillips, Geo. of 

 Yorkshire, U. 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 ; stria; 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. suLGATUS. — 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. 



Belleroplwn decussatus. Fleming, Brit. An. p. 338. 

 Phillips, Geo. of Y'orkshire, IL p. 231, pi. 17, fig. 13.. 



Subglobose, or somewhat longitudinally ovate, covered bj' 

 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 stria;. 



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. Uiui.— Ures Bellerophon, pi. XXVL figs. 1.3, 15. 

 Bellerophon Urii. Fleming, Brit. An. p. 338. Phillipj, 



Geo. of Yorkshire, II. p. 231, pi. 17, figs. 11, 12. NmMut, 

 Ure's Rutherglen, &c. 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 keeh 



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. XX VI. 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 

 somewliat triangularly pointed behind. 



Found at Bowes ; Otterburn, and Harelaw. 



11. B. APERTUS. — The Open Bellerophon, pi. XX VI. 

 figs. 25, 27. 



Bellerophon apertus. Sowerby, Min. Conch. V. p. 108, 

 pi. 469, fig- 1- Fleming, Brit. An. p. 338. Phillips, Geo. 

 of Yorkshire, IL 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 arc sometimes met with nearly 

 four inches in diameter. 



