208 SUPPLEMENT TO THE 



140. LiNGULELLA PRiM^VA, HicTcs. Dav., Sil. Sup., PI. XVII, figs, 33, 34. 



LiNGtJLELLA PKiMiEVA, HicJcs. Quarterly Journal Geo). Soc, vol. xxvii, p. 401, 

 pi. XV, figs. 13, 14, 1871. 

 — — — Popular Science Review, new series, vol. v, 1882. 



Shell marginally elongate-oval, broadly and acutely acuminated posteriorly, rounded 

 anteriorly. Valves very slightly convex, and marked at intervals with concentric lines of 

 growth. 



Length 7 lines by 3 or 4 in breadth. 



Obs. — This very ancient fossil occurs in tolerable abundance at the base of the 

 purple sandstones at Caerfai, Nun's Well, and Porthclair Harbour, on the south coast 

 of St. David's=Upper Longwynds of Murchison or base of the Harlech (Lower 

 Cambrian). This species was discovered by Dr. Hicks, and described and figured by him 

 in 1871. Since then, in 1873, some slightly larger examples were collected by the same 

 distinguished geologist, and I now give a figure of one of them. The shell is, however, 

 usually found much out of shape ; and it is very difficult to obtain specimens with their 

 real form well preserved. L. prhnceva occurs in these ancient red rocks associated with 

 Lingulella ferruginea and Discina Caerfaiensis. L. primava is a larger shell than Z. 

 ferruginea, and may be easily distinguished from it. We have added a figure of a 

 specimens from the purple rocks of Porthclair Harbour (Sil. Sup., PI. XVII, fig. 35) 

 to facilitate comparison. 



According to Dr. Hicks, the Caerfai Group consists chiefly of conglomerates, sand- 

 stones, and purple and green slates and shales ; remains of animal life are found 

 throughout. The most important of these were discovered by him in 1868, in red 

 slates near the base, and consist of a Lingulella, Discina, Leperditia {?), a doubtful head of 

 a Trilobite, and abundant traces of Annelids. They are therefore the earliest animal 

 remains with which we are at present acquainted in Great Britain. 



141. Lingulella Nicholsoni, Callaway. Dav., Sil. Sup., PI. XVII, figs. 31, 32. 



Lingulella Nicholsoni, Callaway. Quarterly Journal Geol. Soc, vol. xxxiii, p. 668, 



pi. xxiv, figs. 11, 11 a, 11 6, 1877. 



" This is a larger species than L. ferruginea, and its sides are not parallel. It 

 closely resembles L. lepis, but L. lepis is wider towards the front, according to Davidson's 

 figure. The Shineton Shales at Shineton, Mary-Dingle, Dryton, Cressage, Bull-Hill 



