GLYPHIOCERAS (SPHENOCERAS) CRENISTRIA. 157 



The shell attains a diameter of 00 mm. with a thickness of -AG mm. 



Affi,iiitiet<. — This species is distinguished from (Ih/pliiocems Htrvdnm, J. Sow., by 

 its more globose form, and by its suture-line. 



BeDiarks. — This is a common and widely distril)uted species, as the long list of 

 references to it at the head of the description testifies. It has been found in the 

 British Isles, Belgium, and the Hartz. It is easily recognised by its globular 

 shape, and the suture-line is also characteristic. Casts of it arc more frequently 

 met with than specimens having the shell preserved (probaljly owing to the tenuity 

 of the test) ; hence the suture-line is generally exposed. 



This species, like G. .striatiDn. (p. 160), appears to be rare in Ireland, and I can 

 only record two localities for it. The specimen from which M'Coy drew up the 

 description in his ' Synopsis ' (loc. cit.) belonged apparently to a private collec- 

 tion, as it is contained in a list of species to which the following heading is 

 appended : — " The following fossils are desci'ibed in my Synopsis, thoixgh not con- 

 tained in the cabinets" [/.''. those Ijelonging to Sir R. Griffith's Collection]. The 

 Goniatites enumerated in this list are G. Bruiviii, G. creimtvhi, G. sphxricitu, 

 G. i<pi)-alix, and G. vittiger. No localities are attached to them. 



The largest individuals belonging to the present species have been found in 

 Belgium ; de Koninck records one having a diameter of 70 mm. and a thickness of 

 55 mm. as the largest he had met Avith. M'Coy's specimen (' Synopsis,' loc. cit.) 

 measured Wro mm. in diameter and 38 mm. in thickness. 



LociiJities. — Loughshinny, county of Dublin ; near Bantry, county of Cork. (Tlie 

 specimen from the former locality is contained in the Dublin Museum of Science 

 and Art — Geological Survey Collection ; that from the latter Ijelongs to Mr. J()sej)li 

 Wright, to whom I am indebted for the loan of it.)' 



Glyi'iiiocekas (SiniEXOCEKA.s) CKKXisTiiiA, ,/. I'll ill i/i.-f, sp. Plate XLII, fig. 5. 



1836. Goniatites cuenistbia, /. Phillips. Geology of Yorkshire, pi. 2. p. 2ok 



pi. xix, figs. 7 — 9. 

 ? 1841. _ _ _ Pal. Foss. Cornwall, Dcvoii, aud W. 



Somerset, p. 121, pi. 1, figs. 23-t a — </. 

 ? 1843. — — F. A. liocmer. Versteiu. Harzgeb., p. 33, pi. ix. 



figs. 10 a, h. 

 — — — /. Morris. Cat. Brit. Foss., p. 180. 



1842^4. Ammonites stuiatus (pars), L. G. de Koninck. Descrip. Anini. Foss. Terr. 



Carb. Belgique, p. 5G8. 

 1848. Goniatites cuenistuia, J. H. Cummintj. Isle of Mau, p. 357. 



— stuiatus (pars), U. G. Bronn. Gesch. d. Natur, vol. iii, p. 545. 



1850. Aqaniues stuiatus (pars), A. d'Orbigny. Prod, do Pak'out. stratigr., vol. i, 



p. 115. 



