70 ROYAL SOCIETY OF CANADA 



BKACHIOPOI>A. 



OBOLELLA, Billings. 

 Obolella Atlantica, Walc. 



Obolella atlantica, Walc, Pioc. Nat. Mus., vol. xii., p. :i6. 



Obolella a(lnvtica,Wii\c., Fauna of Olenellus Zone, 1890, p. 611, pi. Ixxi., fij^s. lia to c. 



" A small species that occurs in great abundance in Newfoundland, 

 and also less frequently at North Attleboro', Mass. It is of the type of 

 0. crassa, but differs in the details of the inner surfaces, and the average 

 smaller size." 



As regards the difference of details from 0. crassa no description is 

 given, and the " Olenellus Fauna " furnish the only means of discriminat- 

 ing the two species.' The surface markings are coarser and more rugged 

 than those of 0. crassa. 



This species was found in the shale which forms a layer in the first 

 conglomerate, and also through a considerable thickness of the overlying 

 shales west of Foster's (Smith's) point. Smith Sound. It thus belongs to 

 the lower part of the Protolenus Zone. 



EAPHISTOMA, Hall. 

 Eaphistoma (?) Kblliensis, n. sp. (PI. III., figs. 4a and 6.) 



The cast of a gasteropod which appears to belong to the above genus 

 is worth describing here, as it holds an intermediate place chronologically 

 between Shaler and Foerste's species of Attleboro', and the numerous 

 species of Kaphistomid shells that come in with Calciferous in western 

 Newfoundland, and the Lower Ordovician limestones further west. 



The shell is discoid, of about three whorls ; the whorls are gently 

 convex, both above and below the keel, but become flattened toward the 

 somewhat ungulated peripheral ridge or keel. The last whorl rapidly 

 enlarges toward the mouth, and is ornamented on the most prominent 

 part of the upper slope of the whorl by a row of faintly elevated 

 tubercles. The front of the shell is concealed in the matrix, and the 

 shape of the orifice is only imperfectly apparent, the curve of the lip is 

 therefore doubtful, but appears to correspond to that of Eaphistoma. 

 The umbilicus is not visible. The width of the last whorl at the aperture 

 is greater than the width of the spiral part of the shell above it, and 

 nearly equal to the height of the shell. 



' Judging from the examples in hands, I am under the impression that the printer 

 has misplaced the reference to the interior of the dorsal and ventral valves of this 

 species, for I tind that fiR. Ir appears to be the mould of the interior of a ventral 

 valve, and fig. ht that of a dorsal valve. 



