156 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



1895. Goniatites sph-^ricus, G. H. Morton. Proc. Liverpool Nat. Field Club 



for 1894, p. 23. 



— Gltphioceras sphjErictjm, F. Bernard. Elements de Pah'ontologie, p. 649, 



fig. 345 a. 



— Goniatites (Gltphioceras) sphjEricus, K. A. v. Zittel. Grundziige der 



Palseontologie, p. 399, fig. 1082. 

 1897. Gltphioceras sphvEricum, A. H. Foord and G. C. Crick. Cat, Foss. Ceph. 



British Museum, pt, 3, p. 157, 

 figs. 73 a — c. 

 James Perrin Smith. " Development of Gly- 

 phioceras and the Phylogeny of the 

 Glyphioceratidse ; " 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 [Grundzuge] of 

 Palaeontology, edited by Charles R. 

 Eastman, p. 552, fig. 1133. 

 1900-1901. Goniatites sph^ericus, G. H. Morton. "The Carboniferous Limestone 



of Anglesey, " Proc. Liverpool 

 Geol. Soc, p. 52. 



Description. — " Shell globular, greatest thickness almost close to the edge of the 

 umbilicus, about 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 stria?, rarely preserved ; internal 

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

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



Dimensions. 



Young specimen (cast) from 

 Bantry, in Mr. Joseph 

 Wright's Collection. 



Diameter of shell . . . .28 mm. 



„ umbilicus . . . . 7 „ 



I [eight of outer whorl (about) . . . 12 „ 



Thickness at umbilical margin (about) . . 22 „ 



