CONULARIA GLOBOSA. 27 



(observed in other species, but not so frequently). The arrangement of the 

 ridges in the marginal groove is very characteristic ; on the edges they turn up 

 abruptly towards the aperture, and meet, or alternate, with those of the adjacent 

 face at the base (PL IIT, fig. 2). Sometimes the ridges bifurcate on the edge. 



Affinities. — This species is quite imlike any other British form. The coarser 

 specimens from the limestone sometimes slightly resemble specimens of C. crassa, 

 but they are readily distinguished by the ornamentation of the marginal grooves. 



Horizons ami Localities. — Upper Devonian: Frankmarsh, N. Devon (rare). 

 Carboniferous Limestone : Yorkshire, Derbyshire, Staffordshire, Dublin, Glasgow, 

 etc. Coal Measures : Coalbrookdale, etc. 



Conularia deflexicosta, Sandberger (?). 



1847. Conularia deflexicosta, F. Sandberger, Neues Jahrb. far Min., etc., p. 1(5, pi. i, fig. 6. 



1896. Comdaria deflexicosta, Gr. F. Wliidbome, Devon. Fauna S. England, vol. iii, p. 35, pi. iv, fig. 13. 



Remarks. — In the monograph referred to above Whidborne described a very 

 imperfect specimen of a Conularian from Pilton, and referred it, "presumptively," to 

 Sandberger's species, G. deflexicosta. I have not seen any other similar specimens, 

 so that the occurrence of this species in Britain remains doubtful. The ridges 

 appear to be tuberculated and the furrows smooth, so that the species must be 

 placed in the section Monilifera?. 



Conularia globosa, sp. nov. PI. Ill, figs. 7, 8. 



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

 with the sides convex. Faces equal, gently convex ; apical angle 7° — 8°. 

 Marginal grooves of medium depth and with rounded base. Facial grooves 

 central, faint, only seen in young specimens. Aperture unknown. Apical septum 

 deeply convex, with circular transverse section. Ornamentation fine. Ridges 

 prominent, crowded (25 — 35 in 5 mm.), forming a very wide angle or broad curve 

 across the face, and continuous across the marginal groove, making an angle of 

 about 140° in its base ; closely studded with small round tubercles. Furrows 

 smooth. 



Dimensions — Length about 100 mm. Greatest width of face, 19 mm. 



Description.. — Of the two specimens known, one (PI. Ill, fig. 8) appears to be 

 quite a young form. Each shows the true cross-section, and the characteristic 

 deeply convex septum. The ridges are very close together, especially towards 

 the aperture ; they are for the most part regular, but in places anastomose, and 

 vary their course. The tubercles are well preserved over the whole shell, and no 

 sign of ornamentation is seen in the furroAvs (PI. Ill, fig. 7 d). 



