40 THE BRITISH CONULARIA. 



DescHption. — The figured specimen, although very imperfect, shows a consider- 

 able amount of shell in a good state of preservation. The septum is finely 

 wrinkled parallel to its long axis, which indicates that the specimen is compressed ; 

 but the ridges, meeting at a broad angle in the " central " marginal groove, and 

 falling away more sharply towards the sides, indicate that the natural form is 

 a rhomb, and not a square. The ridges are very regularly spaced through the 

 whole length of shell, and are for the most part smooth. However, in a few 

 places, the striations of the furrows appear to extend to the ridges, forming slight 

 tubercles, which have probably been worn down over the rest of the shell. 



Affinities. — This small species is quite distinct from the other cancellate types. 

 It resembles C. planiseptata more closely than any other form, but is readily 

 distinguished by the slow rate of tapering, the fine ornamentation, and the nearly 

 smooth ridges. 



Horizon and Locality. — Carboniferous Limestone : Farlow, Salop. 



Type. — British Museum (Nat. Hist.) (reg.no. G. 17GG5). 



Conularia, sp. 



Remarks. — In the Llandeilo rocks of Craighead and Ardmillan fragments of a 

 cancellate Conularia are found, which probably belong to a separate species, but 

 on account of the very imperfect condition of the shells it is impossible to give a 

 definite diagnosis. The transverse section is probably a very much flattened 

 rhomb, for the faces show a great want of symmetry, the ridges forming a 

 straight line across the " central " marginal groove. The marginal grooves are 

 wide, but well-defined, and the ornamentation, which is markedly cancellate, is 

 continuous across the grooves. The longitudinal bars in the furrows are well 

 separated, as in C. planiseptata. 



