CONULARIA HASTATA. 29 



Dimensions. — Length at least GO mm. Greatest width of face, 14 mm. 



Description. — Only one example of this species is known, but its characters are 

 so well marked as to justify its separation as a new species. The shell is well 

 preserved, and has undergone only very slight deformation. This has resulted in 

 three of the faces being slightly ridged down their centres, but the fourth shows a 

 fine groove, which is probably the natural condition. The marginal grooves are 

 also probably a trifle deepened, but in places show a gentle, rounded base with the 

 ornamentation continuing across undisturbed (PI. Ill, fig. 12 c). The transverse 

 ridges are so crowded as to be hardly visible to the naked eye. They are studded 

 with close-set tubercles, rounded below, but on the upper side prolonged into 

 blunt points, which cross the furrow above (PI. Ill, fig. 12rf). The tubercles 

 are for the most part reduced to small triangular hollows. 



Affinities. — This species is readily distinguished from all others by the fine, 

 close-set ridges and the triangular tubercles. 



Horizon and Locality. — Wenlock Limestone : Dudley. 



Type. — British Museum (Nat. Hist.) (reg. no. 8GG). 



Conularia hastata, sp. now Plate IV, fig. 1. 



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

 square. Faces equal (?), flat; apical angle about 18°. Marginal grooves slight; 

 base angular; facial groove fine and central. Aperture, apex, and apical septa 

 unknown. Ornamentation fine ; ridges prominent, closely packed (20 — 25 in 

 5 mm.), forming a broad curve across the face, flat in the centre, and falling to the 

 marginal grooves, where they meet the ridges of the adjacent side at an angle of 

 nearly 00°. Studded with very small, round, distant tubercles, from which fine, 

 sharp lamella3 extend upwards across the furrow. 



Dimensions. — Length, GO — 70 mm. Greatest width of face, 1 7 mm. 



Description. — There are six specimens of this species in the Survey Collection 

 at Edinburgh, all from the same locality. None are at all perfect, and no cross- 

 section can therefore be obtained directly. The only evidence as to its form is 

 that afforded by the course of the ridges. The latter are, in most cases, very 

 nearly symmetrical upon each half of the face, which is usually only the case with 

 square specimens. However, this is not a certain test, and the natural form may 

 have been flattened. The ornamentation is very constant for all the specimens. 

 The ridges vary very little in distribution from apex to aperture, and down 

 the whole length of the shell they are fine, closely packed and very well defined, 

 and the little vertical strioe are usually clearly seen, especially in the external 

 casts (PI. IV, fig. 1 d). 



Affinities. — This shell slightly resembles C. liispida and G. triangularis, but is 

 easily distinguished from both. 



