236 On the Fossil Botany and Zoology of Australia. 



Hobart Town : associated with this there is abundance of a flatter 

 species, concentrically wrinkled and with more irregularly placed, 

 blunt, round spines, which may, or may not, be distinct from 

 the P. fragaria and P. caper ata of the upper Devonian and lower 

 Irish carboniferous shales, but from the state of preservation I 

 cannot satisfy myself of the species. 



Productus undulatus (M'Coy). PL XIII. fig. 2. 



Sp. Char. Subquadrangular, one-third wider than long, gibbose, 

 front slightly concave at the margin ; sides nearly rectangular, 

 obtusely rounded ; beak large, tumid ; surface with fine, close, 

 short, undulating transverse wrinkles ; a few obscure traces of 

 oblong spines towards the margin. 



This species is slightly allied to the Leptana lepis of the Eifel, 

 and the L. membranacea and L. mesoloba (Phil. Pal. Foss.), but 

 is distinguished from the two first by its gibbose quadrangular 

 form, concave front and large tumid beak ; and from the latter 

 by its want of mesial ridge and spines, and by the fine transverse 

 plication of the surface. Length 7 lines, width 10 lines. 

 Rare in the sandstone of Loder's Creek, N. S. Wales. 



Leptcena ? 



A species closely resembling the L. Hardrensis (Phil.), but more 

 square in outline, not so wide, and more coarsely striated, is com- 

 mon in the shale of Dun vegan, N. S. Wales ; it also resembles the 

 Chonites Laguesianus of the Belgian carb. shale and the Chonites 

 Falklandica of the Falkland Islands, but as I have not examined 

 either of those latter species, I prefer leaving the determination 

 of the Australian form uncertain. 



Orbicula affinis (M'Coy). PL XIII. fig. 1. 



Sp. Char. Longitudinally ovate, very much depressed ; margin 

 slightly undulated ; apex acute, excentric towards the right side, 

 one-third of the length from the anterior edge ; surface with 

 fine, sharp, irregular concentric plicae. 



This is only to be distinguished from the Orbicula Davreux- 

 iana (Kon.) of the Tournay carb. shale by the fine sharp con- 

 centric plication of the surface. Length 3 lines, width 2^ lines, 

 height three-fourths of a line. 



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



[To be continued.] 



