of the Rocks associated with the Coal of Australia. 305 



middle of the ventral margin being concave instead of very con- 

 vex, and the sides evenly convex instead of flattened. Length 

 1 inch 6 lines, width 2 inches 2 lines. Common in the sand- 

 stone of Wollongong, N. S. Wales. 



Besides the above, there is a third species of Notomya equally 

 common in the sandstone of Loder's Creek, but of which none of 

 the specimens were good enough to figure or describe ; it has the 

 strong mesial oblique furrow from the beak of the cast, small 

 sinus in the mantle scar, and other characters of the genus, but 

 differs from the preceding species in its regular oval outline, &c. 

 It might be named N. ovalis. 



Pullastra ? striato-costata (M'Coy). PI. XIV. fig. 3. 

 Sp. Char. Transversely oblong, depressed, nearly twice as wide 

 as long, dorsal and ventral margins nearly parallel, anterior and 

 posterior ends elliptically rounded ; beaks rather large, one- 

 third of the width from the anterior end ; surface with about 

 twelve strong angular ridges parallel with the margin ; those 

 ridges are finely striated in the direction of their length. 

 The striation parallel with the ridging distinguishes this from 

 the Pullastra bistriata (Portk.) of the Irish carb. shale, and there 

 being no flat space between the angular ridges, and its less width 

 and straight ventral margin, distinguish it from the M. scalaris 

 (Phil.) of Devonshire. Length 2 lines, width 3J lines. Com- 

 mon in the shale of Dun vegan, N. S. Wales. 



Venus ? gregaria (M'Coy). PI. XVI. fig. 5. 

 Sp. Char. Orbicular, compressed, evenly convex; beaks promi- 

 nent, slightly nearer the anterior side ; lunette deep ovate, 

 smooth ; external ligament short, prominent ; surface covered 

 with coarse rounded concentric strise; margin crenulated 

 within. 



This pretty little species occurs gregariously in great numbers 

 in some spots in the sandstone of Wollongong, N. S. Wales, prin- 

 cipally as hollow casts, which at first sight resemble impressions 

 of the Atrypa decussata. Length 4 lines. 



{Gasteropoda.) 

 Euomphalus minimus (M'Coy). PI. XVII. fig. 4. 

 Sp. Char. Greatest diameter one line; spire depressed, of three 

 small whorls; basal whorl deeper than the spire, rounded, 

 mouth wider than long ; umbilicus small, rounded ; surface 

 smooth. 

 Common in the shale of Dunvegan, N. S. Wales. 



Pleurotomaria subcancellata (Mor.). 

 In the fine calcareous sandstone of Loder's Creek, N. S. Wales. 

 Ann. fif Mag. N. Hist. Vol.xx. 22 



