24 THE BRITISH CONULARLE. 



readily distinguished from them by the large angle and the fine and regular 

 ornamentation. It comes very close to a Bohemian species, 0. insignis, Barrande, 

 from which it differs in having (1) a smaller apical angle, (2) a finer ornamenta- 

 tion, (3) more prominent marginal and facial grooves. It is also very like 

 G. sosia, Barrande, but here again all the grooves are simple, and the course of the 

 ridffes is different. 



Horizon and Localities. — Lower Llandeilo: Ritton Castle, Salop ; Llandrindod, 

 Radnorshire. 



Type.— British Museum (Nat, Hist.) (reg. no. G-. 17GG0). 



Conularia sp. (margaritifera, Salter?). Plate II, fig. 5. 



(?) 1866. Conularia margaritifera, J. W. Salter, in Ramsay's Geol. N. Wales, Mem. Geol. Surv., 



vol. iii, ed. 1, p. 355, pi. xi a, fig. 12, and ed. 2 (1881), p. 563. 

 1906. Conularia doveri, J. Postlcthwaite, Greol. English Lake District, ed. 2, p. 27, pi. v, fig. 16. 



Diagnosis. — Shell small, tapering more rapidly towards the apex. Cross- 

 section probably rhombic. Faces equal, flat ; apical angle about 20°, nearer the 

 aperture 14°. Marginal grooves well defined, of medium depth ; facial grooves 

 central, fine apically, broader and more prominent towards the aperture. Aperture 

 unknown ; apex sharply pointed ; apical septa unknown. Ornamentation incon- 

 spicuous ; ridges fine (30 — 50 in 5 mm.), tuberculated, forming a strongly 

 sigmoidal curve across each half face ; angle 120° — 130°. 



Dimensions. — Length probably about 40 mm. Width of face about 9 mm (?). 



Description. — The specimen upon which Salter based the species margaritifera 

 was described by him as " only a fragment of one segment." If, as I am inclined 

 to believe, this fragment is only half the face, and the " sub-central sulcus " is the 

 result of accident, the specimen from the Skiddaw Slates probably belongs to the 

 same species ; but more material is needed to prove the point. The latter is 

 imperfect, but fairly well preserved, and shows well the fine sigmoidal ridges 

 (PL II, fig. 5 }>), and the marginal and facial grooves. 



Affinities. — The species has, in common with C. coronata, the prominent grooves 

 and fine curved ridges, but is readily distinguished by the smaller size, coarser 

 ornamentation, and the direction of the ridges. 



Horizons and Localities. — Skiddaw Slates: Brunstock Scar. (?) Llandeilo: 

 Dow Hill, Grirvan. Lower Llandeilo : Ty Obry. 



Type. — Sedgwick Museum, Cambridge, and Museum of Practical Geology (reg. 

 nos. 16175, 1G17G?). 



Conularia microscopica, sp. nov. Plate II, figs. G — i). 



Diagnosis. — Shell very small, non-calcareous ; tapering uniformly ; cross-section 

 square. Faces equal, flat; apical angle 10° — 12°. Marginal grooves deep, well 



