CONULARIA PLICATA. 31 



(iv) Shell large; apical angle of face 16° — 20°; apical septa 

 convex ; ridges cease at the edges of the marginal grooves, 

 which are smooth and narrow. Ornamentation as in C. 

 sowerbyi, but coarser. G. breviconventa, sp. nov. 



(v) Shell small ; apical angle of face 8° — 10° ; apical septa convex ; 

 ridges nearly horizontal across the central marginal groove ; 

 ornamentation fine ; longitudinal ridges numerous, sharply 

 defined, not in contact laterally. G. elegans, sp. nov. 



Conularia elongata, Portlock. 



1843. Cmiularia elongata, J. Portlock, Kept. G-eol. Londonderry, p. 393, pi. xxix a, fig. 2. 

 1847. Conularia pectini-costata, F. Sandberger, Neues Jalirb. fur Min., etc., p. 17, pi. i, fig. 7. 



Diagnosis. — Shell small, tapering uniformly ; cross-section square. Faces 

 equal, slightly concave ; apical angle about 10°. Marginal grooves wide and very 

 shallow. Facial groove strong, central. Aperture, apex, and apical septa 

 unknown. Ornamentation coarse ; transverse ridges irregular (8 in 5 mm.), 

 passing horizontally across the face ; interrupted by the facial groove, but con- 

 tinuous across the marginal groove, in which they arch down towards the apex. 

 Furrows crossed by fine, regular, longitudinal strias (20 — 30 in 5 mm). 



Dimensions. — Length about 40 mm. Greatest width of face, 10 mm. 



Description. — The type specimen still remains the only known example of this 

 species. The shell is not preserved, but the ornamentation is fairly well seen. 

 The ridges are irregular and thickened by friction, so that they appear over most of 

 the shell more like the rounded growth-lines of G. linnarssoni, but towards the 

 aperture they are finer, and as many as 15 in 5 mm., and the longitudinal striation 

 of the furrows is seen to extend to the ridges. 



Affinities. — This species resembles G. linnarssoni in the strongly marked central 

 facial groove and the horizontal transverse folds, but is readily distinguished by 

 the cancellated ornamentation and the small angle of the face. 



Horizon and Locality. — Caradoc (?) : Desertcreat. 



Type. — Museum of Practical Geology (reg. no. 12 042). 



Conularia plicata, sp. nov. Plate IV, figs. 2, 3. 



D'mgnosis. — Shell of medium size, tapering uniformly ; cross-section square. 

 Faces equal, flat; apical angle 10° — 17°. Marginal grooves of medium depth and 

 width ; facial grooves absent. Aperture partially closed by short blunt triangular 

 lobes, at right angles to the main axis. Apex sharply pointed ; apical septa 

 unknown. Ornamentation fine; ridges far apart (9 — 12 in 5 mm.), forming broad, 



