28 THE BRITISH CONULARIA. 



Affinities. — This species is most nearly allied to G. quadrisulcata, from which it 

 is distinguished by the convex faces, the deeply convex septum, and the fine 

 ornamentation. 



Horizon and Localities. — Carboniferous Limestone: Avon Gorge and Tort worth. 



Type. — Museum of Practical Geology (reg. no. 11909). 



Conularia hispida, sp. nov. Plate III, figs. 9 — 1 1. 



Diagnosis. — Shell of medium size, thin ; tapering uniformly; cross-section square. 

 Faces equal, flat; apical angle 10° — 12°. Marginal grooves deep and narrow; 

 base and sides rounded. Facial groove fine, central. Aperture, apex, and 

 apical septa unknown. Ornamentation fine; transverse ridges (8 — 24 in 5mm.), 

 forming an angle of 180° — 145° along the central groove ; closely studded with 

 small pear-shaped tubercles, which are prolonged upwards as fine projections 

 about half way across the furrow ; the other half quite smooth. 



Dimensions. — Length about 140 mm. Greatest width of face, 25 mm. 



Description. — This shell is usually found somewhat compressed, but one 

 specimen from Ledbury gives a truly square cross-section (PI. Ill, fig. 10). The 

 state of preservation is good and the characteristic ornamentation is well seen. 

 The ridges (average, 14 in 5 mm.) are more closely packed near the apex, and pass 

 without a break across the marginal grooves. Down the centre of each face the 

 shell is puckered into little short folds, which follow the course of the ridges, and 

 die out before reaching the marginal grooves. The little pear-shaped tubercles 

 (45 — 50 in 5 mm.) are often much worn down and nearly obliterated, but when 

 well preserved are seen slightly clasping the ridge, and tapering upwards into fine 

 points (PL III, fig. 11). The upper half of each furrow is quite smooth. 



Affinities. — This species is readily distinguished from any other by its unique 

 ornamentation. 



Horizon and Localities. — Wenlock Limestone: Dudley; Ledbury. Highest 

 Bala: Thraive Glen, Girvan. 



Type.— British Museum (Nat. Hist,) (reg. no. G. 10041). 



Conularia triangularis, sp. nov. Plate III, fig. 12. 



Diagnosis. — Shell of medium size ; tapering uniformly ; cross-section square. 

 Faces equal, flat; apical angle 12°. Marginal grooves of medium depth and with 

 rounded base. Facial groove fine, central. Aperture, apex, and apical septa 

 unknown. Ornamentation inconspicuous ; transverse ridges fine, closely packed 

 (50 in 5 mm.), forming an angle of 135° — 145° along the central groove, studded 

 with small, closely-packed, triangular tubercles. 



