History of British animals - University of Guam Marine Laboratory

Okthocera. MOLLUSCA. CEPHALOPODA. 239** Striated transversely.10. O. striata.— Nearly cylindrical, septa numerous, deep ; syphon nearlycentral ; surface regularly striated transversely.— Sower. Min. Conch, t. lvii'i.Flem. Wem. Mem. iii. 90.— Transition Limestone, Cork. In the clay-slate ofthe same formation, at the Cove of Cork, another species occurs, the charactersof which are not established.1 1. O. Steinhaueri— Tapering ; chambers deep, partitions distant, evenedged, circular ; syphon close to one side ; striae of the surface regular andeven—Sower. Min. Conch, lx. f. 4.—In Carboniferous Limestone.12. O. gigantea —Shell gradually tapering, finely striated, aperture upwardsof 8 inches in diameter ; septa direct, numerous, deep ; syphon a smalldistance from the centre—Sower. Min. Conch, t. ccxlvi.—In limestone ofthe Old Red Sandstone, Dumfriesshire.*** Surface with transverse ridges.13. O. sulcata—Shell tapering ; ridges waved and striated ; syphon small,6 central. The length of one specimenis 2 inches and , ths, diameter at' 9the base T 3 ths, and at the apex T 5 ths. It contains thirty-one ridges, whichare twice waved in striated— going round the shell both the : ridges and interveninggrooves are finely lire's Ruth. 300,t. xvi. f. 2. Flem. An. Phil. v.202, t. xxxi. 6.—In slate-clay of the Coal Formation.14. O. undata—Shell tapering, ridges waved and smooth ; pipe small, central.In a specimen 1 inch and ,2 ths in length, it is ,7ths in diameter atthe base, and upwards of T* s tha at the apex ; witli eleven ridges, more deeplywaved, and less numerous than the preceding. There is the appearanceof an epidermis of a black colour, and obscurely striated ; where the shell isexposed, both the ridges and the grooves are perfectly smooth. An imperfectspecimen of an Eschara adheres to the shell—Flem. An. Phil. v. 203In slate-clay of the Coal Formation.15. O. annularis.— Subcylindrical ; ridges distant, nearly even and smooth.The largest portion of the shell which I possess is about ] inch in length,and upwards of T35 ths in diameter ; ridges nearly ^th distant ; more obtusethan the preceding, with at least two chambers in the interval.—Flem. Ann.Phil. v. 203.—In Carboniferous Limestone.10. O. annulata.— Tapering, subcompressed, with strong, waved, slightlyoblique ridges, and intervening strife : syphon sublateral ; a space near theaperture without ridges.— Sower. Min. Con. t. cxxxiii.— Carboniferous Limestone,Colebrookedale.17- Q.rugosa.— Subcylindrical; ridges waved, and tuberculated with longitudinallines ; syphon minute, and placed close to the edge. The length of aspecimen which I possess is 1 J inch ; the diameter TG5 ths ; the ridges are T2a thsasunder, and contain two chambers in the interval.—Flem. Ann. Phil. v. 203.—In Carboniferous Limestone.**** With longitudinal planes or furrows.18. O. Gesneri— Conical, with numerous longitudinal furrows, regularlyconcave and close.—Mart. Pet. Derb. t. 38. f, 1, 2—In Carboniferous Limestone,Derbyshire.17- O. angularis.—Nearly cylindrical, angular, with about 16 smooth longitudinalplanes ; syphon small and lateral. I possess about half an inch ofthis shell, which is nearly of equal thickness, scarcely exceeding the tenth ofan inch in diameter Flem. Ann. Phil. v. 203. t. xv. f. 10—In CarboniferousLimestone.