GLYPHIOCERAS (BEYRICHOCERAS) SPH.EROIDALE. 173 



of Ghjphioceras tnincatum, the resemblance to this series in other features is note- 

 worthy, especially in the flattened sides and truncated periphery. The suture-line 

 also is not very dissimilar, comjDaring together, r. ij., the suture-line of (j. dijjiciie 

 with that of d. siilnpfdih-afnui (PL XLVI, figs. 1 '■ and 2 r). 



Jii'DKirJcs. — The specimen from which the above description was chiefly dniwu 

 up having come unexpectedly into my hands after the plates had all been printed, 

 I have not been able to figure it ; the one referred to at the head of this description 

 must therefore .suffice to represent it, and it in fact gives all essential features, the 

 details of the umbilicus being alone deficient ; these are supplied Ijy the recently 

 available specimen. The latter thus fulfils the double office of amplifying structural 

 details, and of confirming the existence of a specific form whose validity might, 

 upon the evidence of a single specimen, have been called in (piestiou. 



Locality. — Little Island, near Cork. 



GLYi'iuorEKAS (Beykichoceuas) sPHJiRoiDALE ? M'CiH/. Plate XLVI, figs, o '/, b; 



5 a, h. 



1844. GoNiATiTES sPHJEKOiDALis, F. M'C'jy. Syuops. Garb. Foss. Irelaud, p. 15, 



pi. iv, fig. 18. 

 185U. Aganides sPHiEEicus (pars), A. d'Orhiijmj. Prod, de Pak'out. stratigr., 



vol. i, p. 115. 

 1852. Ammonites sph^ericus (pars), C. G. Giebel. Fauna der Vorwelt, Bd. iii, 



Abth. i, p. 471. 

 1854. GoNiATiTEs spHJERoiDALis, J. Morris. Cat. Brit. Foss., "iiid ed., p. 304. 

 1862. — — It. Griffith. Jouni. Geol. Soc. Dublin, vol. Lx, 



p. 55. 

 1880. — — L. G. de Koninck. Faune Cale. Carb. Belgique 



(Ann. Mus. Roy. d'Hist. Nat. Belgique, 



scr. Palcout., torn, v), pt. 2, p. 99, 



pi. xlvii, figs. 6, 7 ; pi. xlviii, figs. 10—12. 



1889. Glyphioceuas spujiuoiDALE, E. Ilolzajifcl. Palseont. Abbandl., Dames 



uud Kayser, Bd. v, i, p. 30. 

 1897. — — A. M. Foord and G. C. Crick. Cat. Foss. 



Ceph. British Museum, pt. 3, p. 183. 



Jjt'.siiiptiiiii. — Shell spheroidal, somewhat comprcs.scd laterally, rather widely 

 uiubilicated ; greatest thickness at the margin of the mnbilicu.s, about four-sevenths 

 of the diameter of the shell, height of outer whorl about three-sevenths of that 

 diameter. Nmnljer of whorls unknown. Inclusion fully three-fourths. Umbilicus 

 pi-ubably of moderate depth, but not fully available for examination. ANHiorl semi- 

 lunate in section, nearly twice as wide as liigh, indented to about three-fourths of 



