17(5 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



concentric lines of gi'owtli, which form a deep and wide hyijouomic siiuis upon 

 the periphery. 



The name of this species does not occur in Sir R. Griffith's list of localities 

 appended to M'Coy's ' Synopsis ' (18G2), but the tablet is inscribed " Co. Limerick 

 — Presented by Sir R. Griffith, Bart." 



Locality. — County of Limerick (exact locahty unknown). 



GLYrniocEi;As (Beyi;ichoci:i;as) coi.tulentim, G. C. did-. Plate XLVII, tigs. 1 <i, h ; 



Plate XLVIII, figs. 1 a—c. 



1899. Glyphiocekas coepulentum, G. C. Crick. Aim. Mag. Nat. Hist., ser. 7, 



vol. iii, p. -447, fig. 12. 



Description. — Shell much inflated, the gi-eatest thickness at the umbilical margin, 

 about three-fifths of the diameter of the shell ; the height of the outer whorl nearly 

 one-half of the same. Whorls few, their number not determinable from the specimens 

 available ; inclusion nearly comj)lete owing to the greatly expanded sides of the 

 shell ; umbilicus deep, with subangular margin and precipitous sides ; about three- 

 tenths of the diameter of the shell in width. Whorl sublunate in cross-section ; the 

 height about three-fourths of the width ; indented to nearly one-half of its height 

 hy the preceding whorl. Periphery- broadly convex, imjjerfectly defined ; merging 

 in the inflated sides. LTmbilical zone distinctly defined, narrow, nearly perpendi- 

 cular to the plane of symmetry of the shell. 



Body-chamber occupying nearly the whole of the last whorl ; aperture not i)re- 

 served, but the lines of growth indicate the j)resence of a slight crest near the edge 

 of the umbilicus, and a very wide and shallow hyponomic sinus. Chambers shallow; 

 suture-line as in PL XLVIII, fig. 1 c. 



Test ornamented with fine, subregular, raised lines, which become more distinct 

 in the adult shell ; these extend obliquely and abruptly l)ackwards from the umbili- 

 cal margin and form a very wide and shallow sinus upon the periphery. Tlie latter 

 bears some widely spaced, faintly defined longitudinal bands in the adult ; in the 

 young shell these bands extend to the sides of the shell ; though not a ^■ery con- 

 spicuous feature, these longitudinal bands give a certain distinguishing character to 

 the ornamentation of the shell when viewed in connection Avitli the transverse lines, 

 and as they persist throughout the growth of the shell they are of definite value as 

 specific data.' The cast in the adult individual shows near the apertiu-e two wide 

 and shallow l)ut (juite conspicuous constrictions, and there are indications of similar 

 features in the young shell. 



' The lithographer has omitted the longitiuliual bands iu the figures of the youug shell (PI. 

 XLVUI, figs. la,b). 



