of the Rocks associated with the Coal of Australia. 307 



uels only two (?), placed with a slight obliquity to the long axis 

 of the shell, giving it a twisted appearance, being placed at the 

 sides (or extremities of the short axis) of the oval section at the 

 base, and being at the ends (or extremities of the long axis) of the 

 oval section near the small end ; sides very convex, without mesial 

 furrow; transverse sulci coarse (about fifteen in half an inch), 

 continued uninterruptedly across from one side-furrow to the 

 opposite. 



This extraordinary fossil seems to differ from all known Conu- 

 laria in having but two instead of four longitudinal furrows (for 

 although MM. D'Archiac and Verneuil give an oval section of 

 their C. Brongniartii showing but two furrows, I suppose this to 

 be erroneous, as it neither agrees with their description nor larger 

 figure) . This is distinctly seen in the small fragment here figured, 

 as well as the uninterrupted passage of the transverse ridges from 

 one oblique sulcus to that on the opposite side, and the undivided 

 nature of the intermediate faces. The larger specimen figured is 

 not so perfect, but shows the slow rate of increase. The trans- 

 verse sulci are about as numerous as in the C. lavigata, but that 

 species has four unequal, divided faces, and is, together with all 

 the described species, so different as not to require a particular 

 comparison. The oblique or twisted direction of the longitudinal 

 sulci above-noticed, I find also to exist in the recent Creseis spi- 

 nifera of the Mediterranean, so that what would otherwise seem 

 an anomalous character of the present fossil, tends rather to 

 strengthen the affinity between Conularia and the recent Ptero- 

 poda. 



Not uncommon in the sandstone of Muree, N. S. Wales. 



Conularia tenuistriata (M'Coy). PL XVII. figs. 7 &8. 

 Sp. Char. Quadrangular, pyramidal, section rhomboidal, taper- 

 ing at the rate of two lines in one inch ; sides unequal, two nar- 

 row sides flat or slightly convex, about half the width of the 

 two wide ones, which are slightly concave ; a strong longitu- 

 dinal furrow down each of the lateral angles, and a faintly 

 marked one in the middle of each of the broad faces ; trans- 

 verse striae very fine, twenty-seven to twenty-nine in the space 

 of half an inch, passing uninterruptedly, with a slight upward 

 curve, across the broad faces, more nearly straight on the two 

 narrow ones. 



This species equals or even exceeds the Conularia Gerolstein- 

 ensis in the fineness of its transverse striation, while it is distin- 

 guished from that and all other species with which I am ac- 

 quainted by the great disproportion in the width of the sides. 

 One specimen, imperfect at both ends, measuring 1J inch long, 

 had the long diameter at the base 9 lines, the short diameter at 



22* 



