ON THE FURTHER STRUCTURE OF CONULARIA 



I NORN ATA, DANA, AND HYO LITRES LANGEOLATUS, 



MORRIS, sp., (=THECA LANCEOLATA, MORRIS). 



By R. Etheridge, Junr. 



Palaeontologist to the Australian Museum and Geological 

 Survey of N.S.W. 



1. Conularia inornata. 

 (Plate XX., fig. 1). 



Conularia inornata was originally described *' by Prof. J. D. 

 Dana from a fragmentary specimen obtained during the visit of 

 the United States Exploring Expedition under Commodore 

 Wilkes, U.S.N., to these shores. A few years ago more perfect 

 examples, upwards of one foot in length, were described f by 

 the late Prof. L. G. de Koninck, in the collection of the late 

 Rev. W. B. Clarke, F.R.S. So far, however, the structure of 

 the proximal end of the shell is unknown. 



In 1873 the writer had the good fortune to figure the most 

 perfect example of Conularia yet discovered, J from the Car- 

 boniferous Limestone of the East of Scotland, in which the sides 

 of the shell were inflected inwards, on all four sides, at a regular 

 and similar angle, and to a like extent, each flap separated as it 

 were by a deep groove from its neighbour, and the whole leaving 



* U.S. Exploring Expedition, 1838-1842, under Charles Wilkes, U.S.N. 

 Vol. X. Geology, by J. D. Dana, 1849, p. 709. 

 t Foss. Pal. Nouv. Galles du Sud, Pt. 3, 1873, p. 314, t. 22, f. 14. 

 X Geol. Mag. 1873, X. p. 295. 



