196 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



GrLYPHIOCEEAS (MuENSTEEOCEEAS) OBESUM, sp. 11UV. Plate XLIII, figS. 3 a — C. 



Description. — Shell subglobose, rendered elliptical by pressure, the longer 

 (antero-posterior) diameter measuring 112 mm., the shorter 100 mm. ; greatest 

 thickness at the umbilical margin, about one-half of the shorter diameter of the shell ; 

 height of outer whorl rather less than one-half of that diameter ; inclusion almost 

 complete. Outer whorl indented to about two-fifths of its height by the preceding- 

 whorl. Umbilicus proportionally small, about one-fifth of the smaller diameter of 

 the shell, with subangular margin. Periphery at first very broadly rounded, but 

 becoming sub truncate in the adult shell as the aperture is approached. Inner area 

 narrow, slightly concave. 



Body-chamber occupying at least an entire volution. Chambers shallow. 

 Suture-line as in PI. XLIII, fig. 3 c. 



Test quite smooth, with only faint lines of growth, which may be seen here and 

 there proceeding from the umbilicus. No distinct indications of constrictions can 

 be seen, but the surface of the cast is badly preserved and eroded in places, and they 

 may thus have been obliterated. 



(short) 100 mm. 



18 „ 



Affinities. — Glyphioceras (Muensteroceras) ellipsoidale has been compared with the 

 I in scut species under the description of the former. 



Remarks. — The large individual representing the present species was obtained 

 in the quarries of Little Island, and forms part of Mr. -Joseph Wright's small but 

 interesting collection from the neighbourhood of Cork. 



Locality. — Little Island, near Cork. 



GrENUS GrASTElOCEEAS, Hyatt, L883 (emend. Karpinsky, 1S90). 

 GrASTEIOCEEAS OIECUMNODOSUM, Sp. UOV. Plate XLIX, figS. 10, 11. 



Description. — Shell rather small, inflated, umbilicated; greatest thickness at the 

 margin of the aperture ; height of outer whorl about one-half of the diameter of the 





Dimensions. 





Larj 



jo specimen i: 



Diameter of shell (long) 





112 mm, 



,, umbilicus (long) 





21 „ 



Height of outer Avhorl . 





-18 „ 



,, above preceding whorl 





;32 „ 



Thickness at umbilical margin 





53 „ 



