156 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



1895. GoNiATiTES SPH^,KICTS, G. B. Morion. Proc. Liverpool Nat. Field Club 



for 1894, p. 23. 



— Gi-YPHiocEKAS sPHyERicuM, F. Bernard. Kk'ments de Pak'ontologic, p. G49, 



fig. 345 A. 



— GoNiATiTES (GLTrHiocERAs) spH^Eicus, K. A. V. Zittel. Grundziigo der 



PaliBontologie, p. 399, fig. 1082. 

 1897. Gltphioceras sPHyEEicuM, A. H. Foord and G. C. Crick. Cat. Foss. Cei)h. 



Britisli Museum, pt. 3, p. 157, 

 figs. 73 a — c. 



— — — James Perrin Smith. " Development of Glj- 



phioceras and the Phylogeny of the 

 Glj'phioceratidse ; " Proceed. Cali- 

 fornia Acad. Sci., ser. 3, Geology, 

 vol. i, pp. 110, 113, 115. 

 1900. — — A. Hyatt. In translation of Karl A. von 



Zittel's Elements [Grundziige] of 

 Palaeontology, edited by Charles E. 

 Eastman, p. 552, fig. 1133. 

 1900-1901. GONIATITES sPH^Eicus, G. n. Morton. "The Carboniferous Limestone 



of Anglesey, " Proc. Liverpool 

 Geol. Soc., p. 52. 



Doi^cviptinn. — " Shell globular, greatest thickness almost close to the edge of the 

 unil)ilicus, a])Out three-fourths of the diameter of the shell in the adult, proportion- 

 ately greater in the young ; height of outer whorl about four-ninths of the diameter 

 of the shell. Whorls eight to ten ; inclusion almost complete ; umbilicus rather 

 small, acute-edged, a little more than one-sixth of the diameter of the shell in 

 width, with steep sides. Whorl semilunate in section, its height about three-fifths 

 of its width ; indented to rather more than one-half of its height by the preceding 

 whorl ; periphery broadly convex ; sides convex, very slightly depressed around 

 the umbilicus in the adult; inner area nearly perpendicular to the plane of 

 symmetry. Body-chamber occupying the whole of the last whorl ; aperture not 

 seen. Chambers not very deep, about eighteen in a whorl. [Suture-line as in 

 PL XLII, figs. 1 a, b, 2.] Test with fine spiral strine, rarely preserved ; internal 

 casts with obscure transverse stri?e, and at intervals with very shallow constric- 

 tions." (' Cat. Foss. Ceph. British Museum,' loc. cit.) 



Dimen.'iioiis. 



Young specimen (cast) from 

 Bantry, in Mr. Joseph 

 Wright's Collection. 



Diameter of shell . . . .28 mm. 



„ umbilicus . . . . 7 ,, 



Height of outer whorl (about) . . . 12 „ 



Thickness at umbilical margin (about) . . 22 „ 



