112 



Proceedings of the Royal Irish Academy. 



Orthoceras aciculare, Brown, 1860. PL v., fig. 23. 



Orthoceras aciculare, Brown, 1860. Trans. Manch. Geol. Soc, vol. i., 

 p. 220. PL vii., fig. 39. 0. minimum, Baily, 1860. Expl. 

 sheet 142, Geol. Surv., Ireland, p. 13, fig. 3. 



This species is very small, with a very gradual taper; septa 

 moderately close, and slightly convex ; surface smooth. 



Locality — Very abundant at Foynes Island and Lisdoonvarna. 

 Small orthoceratites, which probably belong to the same species, are 

 common in the Pendleside series of England. Brown's example 

 came from near Todmorden. 



Observatio7is — Tiny fragments of the young shell of a slender 

 Orthoceras are very common at Foynes Island. These are, I expect, 

 the terminal portions of 0. ascicularis. Brown, however, describes, as 

 occurring with this species, another very small one, 0. microscopicum. 

 It is possible that 0. pyymmim de Koninck, from Chokier, may prove 

 to be identical with Brown's species. 



Orthoceras acutum sp. nov. PL v., figs. 24, 25. 



Specific characters — Shell straight ; section circular ; rate of tapering 

 1 in 4, but more rapid near the apex, which is actually pointed. 

 Septa numerous and close. Septuncle not seen. Surface apparently 

 smooth. Shell thin. 



Locality — The shales immediately above the Carboniferous 

 Limestone, Lisdoonvarna. 



Ohservatio7is — This species differs from those associated with it by 

 its rapid rate of taper and pointed apex. The largest example I 

 obtained measui-es 37 mm. 



^ NAVTILIBM 

 Coelonautilus quadratus, Flem. sp., 1828. PL vL, figs. 1, !«. 



This species is not common, but has been obtained from the Coal 

 Measures in England, and the Lower Limestone group in Scotland. I 

 have never met with it previously in the Pendleside series. 



Locality — Foynes Island. 



Solenocheilus sp. ? 



A large compressed example was obtained by me from the upper 

 marine band. Puffing Hole, Kilkee. Unfortunately it is not sufficiently 

 well preserved for definite determination. 



