328 Miscellanea. 



the Leak of the right valve ; the long spoon-shaped hollow 

 extending from the beaks to the posterior muscular impressions, 

 and its lateral bounding ridges obscurely marked. 

 Distinguished from the N. tiecurifonnin by its broadly rounded 

 anterior side, smaller beaks, thinner shell, and consequently more 

 faintly marked ridges and impressions on the cast, and by the mid- 

 dle of the ventral margin being concave instead of very convex, 

 and the sides evenly convex instead of flattened. Length 1 inch 

 6 lines, width 2 inches 2 lines. Common in the sandstone of 

 WoUongong, 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 farrow from the beak of the cast, small sinus 

 in tile mantle scar, and other characters of the genus, but difl'ers 

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

 might be named N. oialis. 



PuUasLra ? striato-costato (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 bistriaUi (Portk.) of the tnsh carb. sliale ; and there 



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



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



(Phil) of Devonshire. Length 2 lines, width 82 lines. Common 



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



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



Sp. Char. Orbicular, compressed, evenly convex ; beaks prominent, 

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

 external ligament short, prominent ; surface covered with coarse 

 rounded concentric slriee ; margin crenulated within. 

 1 his pretty little species occurs gregariously in great numbers 

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

 cipally as hollow casts, which at first sight resemble impressions of 

 the Atrypa decunsata. Length 4 lines. 



{Gasteropoda.) 

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

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

 small whorls ; basal \\ horl deeper than the spire, rounded, mouth 

 wider than long ; umbilicus small, rounded ; surface smooth. 

 Common in the shale of Dunvegan, IS!. S. Wales. 



Pleurotomaria suhcaiicellata (Mor.). 

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



Pleurotomaria Strzeleckiana (Mor.). 

 Common in the fine calcareous grits of "WoUongong, N. S.Wales. 



