CONULARIA ASPERSA. 10 



(ii) Ridges fine, turning up at an angle in the marginal groove, 

 and curving across the face. G. defiexicosta, Sandberger. 

 (iii) Ridges fine and closely packed ; faces convex. 



G. globosa, sp. nov. 



(ft) Tubercles prolonged as sharp projections on to the furrow 



above. 



(i) Tubercles oval ; projections fine, curving, hair-like, and 



irregular in length. G. hispida, sp. nov. 



(ii) Tubercles short, blunt, triangular. Ridges fine, and 



closely packed. G. triangularis, sp. nov. 



(iii) Tubercles prolonged upwards as sharp, straight lamellae, 



extending nearly across the furrow. 



G. hastata, sp. nov. 



Conularia aspersa, Lindstrom. Plate I, figs. 5 — 9. 



1873. Conularia bi/asciata, J. W. Salter, Catal. Cambr. Silur. Foss. Woodvv. Mas., p. 171 (a. 926). 

 1884. Conularia aspersa, G. Lindstrom, Silur. G-astrop. Gotland, p. 46. 

 1902. Conularia bifasciata, F. E. C. Reed, Geol. Mag. [4], vol. ix, p. 123. 



Diagnosis. — Shell large, very thin ; tapering uniformly. Cross-section probably 

 square. Faces equal, flat ; apical angle about 20°. Marginal grooves shallow, 

 inconspicuous ; central facial groove faint and inconstant, flanked by a pair of 

 fine internal ribs, converging from 3 mm. to less than "25 mm. at the apex, 

 marked on the exterior by fine black lines. Aperture nearly closed by four 

 triangular lobes, forming an elevated cone; apex sharply pointed; apical septa 

 unknown. Ornamentation inconspicuous ; ridges fine, closely packed (40—100 in 

 5 mm.) ; arched gently across each face, meeting at a wide angle and without 

 break in the marginal grooves and undisturbed by the central ribs; studded with 

 small round tubercles. Furrows smooth. Growth-lines follow the course of the 

 ridges. 



Dimensions. — Length at least 120 mm. Width of face, 35 mm. 



Description. — The British species, which is common in the Lower Ludlow Flags 

 of Shropshire, is undoubtedly the same as the species from Gotland described by 

 Lindstrom (PL I. fig. 8 a). I have examined a large number of the Swedish 

 forms, and find that they are quite indistinguishable from the British specimens, 

 except for the fact that as a rule the ornamentation is better preserved. Salter's 

 name, bifasciata, is the earlier, but in the ' Catal. Cambr. and Silur. Foss.' no 

 description or figure is given, so that it can only be regarded as a MS. name and 

 Lindstrom's name, aspersa, must be adopted. 



The " internal septa " of Lindstrom are well seen in almost every example, 



