GLYPHIOCERAS (BEYRICHOCERAS) SPIRALE. 101 



Dimensions. 



Specimen from RathcahiU, in Science 



and Art Mus., Dublin (Geol. Surv.), 

 No. 3450 C. 



Diameter of shell . . . .30 mm. 



,, umbilicus . . . G ,, 



Height of outer whorl . . . 15 ,, 



Affinities. — This species seems to have affinities with the reticulatum group, and 

 in particular with 67. {II.) reticulatum itself. It differs from this species in its much 

 smaller umbilicus, and in the character of its ornaments, the delicacy of which is 

 remarkable ; the transverse striae are in fact much finer than those of G. (B.) reticu- 

 latum, and the spiral ones so conspicuous in the latter are only feebly developed 

 in the present species, so as to be scarcely perceptible without the assistance of a 

 lens. The contrast between the two species as respects their ornamentation, etc., 

 is well represented in figs. 2 a and 5 of PI. XLIX. 



Locality. — RathcahiU, near Abbey field, county of Limerick. 



Glyph ioceras (Beyrichoceras) spirale, J. Phillips, sp. Plate XLIX, fig. 0. 



1841. Goniatites spiralis, J. Phillips. Pal. Foss. Cornwall, Devon, and West 



Somerset, p. 121, pi. 1, fig. 233. 



1843. granosus, /. E. Portlock. Geology of Londonderry, p. 407, 



pi. xxix a, fig. 9. 

 striatus, F. A. Roemer. Verstein. Harzgeb., p. 34, pi. ix, 



figs. 11 a, b. 

 spiralis, J. Morris. Cat. Brit. Foss., p. 180. 

 granosus, /. Morris. Ibid., p. 179. 



1844. spiralis, F. M'Coy. Synops. Carb. Foss. Ireland, p. l(i. 

 1848. H. B. Brown. Geschich. d. Natur, vol. iii, p. 544. 

 1852. Ammonites spiralis, C. G. Giebel. Fauna derVorwelt, vol. iii. pt. l,p. 454. 

 1854. Goniatites spiralis, /. Morris. Cat. Brit. Foss., 2nd ed., p. 304. 



granosus, J. Morris. Ibid., p. 303. 

 1855-7. spiralis, J. Kelly. Journ. Geo]. Soc. Dublin, vol. vii, p. 7. 



granosus, /. Kelly, [bid., vol. vii, p. 7. 

 I860. spiralis, It'. 11. Baily. Geol. Surv. Ireland, explan. of sheei 



101 of the Maps, p. 13. 

 L862-4. F. A. Roemer. Palaeontogr., vol. ix, p. 11. pi, iv. 



figs. 2 a — c. 

 L864. J. W. Salter. Geology of the Country around Oldham 



(Mem. Geol. Surv.), p. 59. 

 ? 1878. — Baylei, A. Leymerie. Descrip. geol. et pak'ont. Pyrenees, p. 



747, pi. c, Bg. I, 

 1888. si'ikai.is, /,' Etheridge. Brit. Foss., vol. i, Palaeozoic, p. 313. 



