248 
Jxelations and Differences. — Morris compares tins species with O. 
irregularis, de Koiiinck ; it differs by its small apical angle, by its greater 
length, and by the mncb greater distance between the transverse folds. The 
grooves separating the folds in C. irregularis have nearly the small breadth 
as the folds, and number eighteen or nineteen in a length of ten millimetres, 
Avbile in C. Icemgatus there are only eleven or tAvelve in the same sj)ace. 
Horizon and Localities . — According to McCoy and Dana this species 
is abundant in the limestone at Harper’s Hill, and in the micaceous sand- 
stone at Black Creek. Messrs. Clarke and Morris found it in a brown 
micaceous sandstone at Muree Quarry, Baymond Terrace, where it is asso- 
ciated with C. tenuistriata, McCoy, and fragments of plants among which 
Crepin thinks he recognises Scliizopteris. 
CoNULAEiA INORNATA, J. D. Dana} 
PI. XXII, Pig. 14. 
Conularia inornata, J. D. Dana, 1819, Geol. Wilkes’ IT. S. Bxplor. Exped., p. 709, pi. 10, 
fig- 8. 
This large and heautifnl pyramidal shell is rectangular in section, the 
small sides having only three-quarters the breadth of the large sides. The 
four faces are depressed, and faintly grooA^'cd in the middle ; the folds orna- 
menting them are slightly arched, and those of the large faces are also 
oblique to the main axis of the shell. The apical angle is only 10° or 12°. 
The side angles are occupied by a broad groove, at the bottom of which is a 
distinct rib, produced by the raising of the ends of the transverse folds, which 
jut into the groove, giving it the appearance of a double longitudinal canal. 
The transverse folds are smooth, and most of them are interrupted in the 
middle of their length by a small midrib, which is present on all four faces 
of the shell ; they are not very close together, numbering only nine or ten for 
every ten millimetres of length. 
Dimensions . — One of the fragments of this beautiful species is twenty- 
six centimetres long. The specimen would he at least forty centimetres long 
if the summit were complete, although the diameter of the base is only four 
centimetres. 
' [R. Etheridge, .Junr., Procs. Linn. Soc. N.S. AAhales, 1890, IV (2), p. 751, t. 20, f. 1.— AAhS.D, 
