POTERIOCERAS FUSIFORME. 43 



determine iu tliese cases -wLetbei' such features are of sufRcieut iuiportance to 

 entitle their possessor to be treated as an independent species, or, on the other 

 hand, whether it should be merged in one^ already established. Any future 

 attempt to determine with more certainty the affinities of E. Baili/l must depend 

 upon fresh evidence ; as the matter at present stands it is preferable to retain de 

 Koninck's name for this fossil. 



LocalUy. — Samphire Island, county of Kerry. 



Famihj Poteriocehatid.e. 



Genus Poteriocekas, M'Goij, 1844. 



POTEKIOCEKAS FUSIFORME, ,/. (/(' G. Soirerhj/, sp. Plate XV. 



1829. Okthocera fusifohmis, J. de O. Sowerby. Miu. Couch., vol. vi, p. 107, 



pi. dl.xsxviii, fig. 1 (exel. fig. 2). 

 1S36. Okthoceeas fusiforjie, Phillips. Geol. of Yorkshire, pt. 2, p. 238, 



pi. sxi, fii^s. \Ai, 15. 

 1844. PoTEKiocEKAS FUSIFORME, M'Col/. S^Dop. Carb. Foss. Ireland, p. 10. 

 1844. Apioceeas FrsiFOusiE, Fahrenkohl. Bull. Soc. Imp. Nat. Moscou, vol. 



xvii, p. 781. 

 18-54. Oethocehas fusifokme, Raiighton. Journ. Geo]. Soc. Dublin, vol. vi, 



p. 48, pi. — , fig. 4. 

 1855. — (Poteeioceeas) fusifoeme, M'Coi/. Brit. Pal. Foss., fase. 



iii, p. 569. 

 1862. Poteeioceeas fusifoe.\ie, Griffith. Jouru. Geol. Soc. Dublin, vol. ix, 



p. 55. 

 1876. — — Armslronf/, Young, and Robertson. Catalogue 



of the Western Scottish Fossils, p. 59. 

 ? 1880. Gomphoceeas fusifokme, L. G. de Eoninck. Faune Calc. Carb. Bel;;., 



torn. V, p. 42, pi. xsxvii, figs. 4o — c. 

 1888. Poteeioceeas fusifoeme, A. H. Foord. Cat. Foss. Ceph. British Museum, 



pt. 1, p. 259. 



Description. — Shell of medium size, fusiform, gradually expanding, and then 

 contracting towards the aperture, curved in the apical region, straight above ; 

 flattened on the ventral or outer curvature, conspicuously inflated on the dorsal 

 side (PI. XV, fig. 1 c). The apical part slender and tapering to a fine point. 

 Upper part of body-chamber contracted in the region of the aperture, which is 

 simple as in Cyrtoceras. Septa and base of body-chamber markedly oblique at 

 the sides, the septa nearl^^ horizontal in the siphuncular region, strongly arching 

 upwards along the median line of the dorsal region (PI. XV, figs. 1 a, 1 c). Septa 



