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BY FELIX RATTE, M.E. 139' 



II. — On the Muscular impression of the Genus Notomya 



(MiEONIA.) 



(Plate III.) 



Notomya [Moionia) elongata, Dana; Etheridge, Catal. Aiistr. 

 Foss. p. 73; de Koninck, Foss. Pal. Nouv. Galles &c. (1877),, 

 Pt. 3, pi. 20, fig. 6, &c. 



The specimen of this fossil represented by de Koninck is from 

 Illawarra, and those in the Museum from the same district, have 

 been collected at Jamberoo. There, all the carboniferous marine 

 fossils are in sandstone, and it is very rare to find their tests. 



However, de Koninck's figure does not show the remarkable 

 peculiarities of the casts of these shells. The principal of these 

 peculiarities is the fringed outline of the anterior muscular 

 impression which, accoi'ding to Dana (Amer. Jour. Science, (1847), 

 IV. p. 1.58) is a character of his original genus, as well as another 

 small impression similar to that of Astarte. 



I give the figure of a good internal cast in the Museum, but as in 

 this the fringed outline is rather defaced, I give separately the 

 figure of the impression from another still better specimen. 



