308 THE CARBONIFEROUS SYSTEM. 



delicate oblique strite on their edges. The ribs vary much in their 

 distance in diflferent parts of the same specimen, and in different 



Fig. 117. — Conularia planicostata. 



specimens (from five in a line to ten in a line). They form an angle 

 of about 120° in the middle line of each face — breadth of full-grown 

 specimens about half an inch ; length, two inches or more. There is 

 no indication whatever that this shell had any internal partitions, 

 though it occurs both flattened, as at Big Plaister Rock, and retain- 

 ing its original form, as at Irish Cove and Windsor. Mr Ilartt 

 has proposed the name " Nova Scotica " for a more elongated form, 

 with finer and more numerous ribs ; but on comparing numerous 

 specimens, I am inclined to regard it as a variety. The shell of 

 Conularia is usually regarded as that of a Pteropod, which seems the 

 most probable view. If the shell of a Cephalopod, it must have been 

 of the nature of a straight Argonauta. It is curious to observe in the 

 flattened specimens that the shell always gives way at the edges, with- 

 out breaking, as if there was a suture or weak line there. The shell 

 was exceedingly thin, especially at the smaller extremity, where it 

 seems to terminate in an obtuse rounded form. The aperture in the 

 best specimens rises at the sides in angles corresponding to those of 

 the plications. 



Gasteropoda. 



Euomphalus, a small species with narrow whorls, resembling E. 

 quadratus, M'Coy, but slightly rounded above and marked with lines 

 of growth, appears in fragments in Mr Ilartt's collections from Windsor, 

 and seems to be the same with still more imperfect specimens in my 

 own collection from the galena-bearing limestone of Gay's River. A 

 small species, similar to E. Icevis, also occurs in Mr Poole's collections 

 from Windsor. 



Euomphalus exortivus (Fig. 118), n. sp., coll. J. W. D., East River, 

 Pictou. — About half an inch in diameter, with about five narrow 

 whorls coarsely marked with lines of growth, and with a strong rib 

 along the middle of the whorls above. Collected by Mr D. Fraser. 



Bellerophon. — I have a specimen collected by Professor How at 



