neio or little-known Goniatites from Ireland. 



419 



Horizon and Locality. Both examples known to me are 

 from the Carboniferous Limestone, St. Doulagh's, Co. Dublin, 

 Ireland. 



Glyphioceras ellipsoidale, sp. n. (Fig. 14.) 



Sp. char. Shell subglobose, somewhat compressed, nar- 

 rowly umbilicated ; greatest thickness at the margin of the 

 umbilicus, about four sevenths of the diameter of the shell ; 

 height of outer whorl about three sevenths of the diameter of 

 the shell. Whorls (? number); inclusion about two thirds ; 

 umbilicus deep, with subangular margin and nearly perpen- 

 dicular sides, about three elevenths of the diameter of the 



Fig. 14. 



Glyphioceras ellipsoidale. — Lateral view of the type specimen in the collec- 

 tion of the Museum of Science and Art, Dublin. Carboniferous 

 Limestone : Kildare, Ireland. About three fifths natural size. 



shell in width, exposing the edges of the inner whorls. 

 Whorl semielliptical in cross-section, the height about three 

 fourths of the width ; indented to nearly one third of its 

 height by the preceding whorl ; periphery broadly convex, 

 imperfectly defined, continuous with the sides ; sides convex, 

 a little flattened near the umbilicus ; umbilical zone narrow 

 convex, nearly perpendicular to the plane of symmetry of the 

 shell. Body-chamber apparently occupying the whole of the 

 last whorl ; peristome with a broad, feeble, lateral crest and 

 a wide and deep hyponomic sinus. Chambers (? depth) ; 

 suture-line not seen. Test almost perfectly smooth, with 

 obscure growth-lines near the aperture. 



