444 
Ohs. Witli age tlie dorsal valve becomes very convex, and the frontal margin 
considerably thickened. It approaches most closely to the R. concinna of the Great 
Oolite and Bradford Clay, but in its general aspect it is a coarser shell, and the 
plicse are more irregular. I have seen about twenty examples, so that it must be very 
abundant. In the hollows of the striae are occasionally Polyzoa and attached 
Poraminifera. {Moore.) 
Loc. Wollumbilla District {The late Rev. TV. B. Clarke). 
PlIYNCHONELLA SOLITAKIA, Moore, PI. 20, fig. 19. 
Rhynchonella soliiarki, Moore, Quart. Joiirn. Geol. Soc., 1870, xxvi., I’t. 2, X). 245, t. 10, f. 10. 
Sp. Char. Shell wider than long ; ventral valve with broad mesial sinus, in 
which are four widely spreading costre, with a single lateral costa on either side of 
the sinus. Towards the umbo the shell is smooth, and without appearance of costse. 
{Moo7'e) 
Ohs. Only a single specimen of a ventral valve of this species occurred in one of 
the Wollumbilla blocks and it was not quite perfect. 
Loc. Wollumbilla {The late Rev. TV. R. Clarice). 
Order-CLISTEMTEKATA. 
Pamily— DISCINID^. 
■ Oembs — DISCIJTA, Lamarck, 1819. 
(Hist. Nat. Anim. sans Verteb. vi.. Ft. 1, p. 236.) 
Discina APiCATiis, Moore, PI. 20, fig. 15. 
Discina apicaJis, Moore, Quart. Journ. Geol. Soo., 1870, xxvi.. Ft. 2, ij. 244, t. 10, f. 13. 
Sp. Char. Shell small, round, or slightly ovate ; apex very acute, almost 
central, or inclined to anterior end ; shell-structure tliin, with faint concentric lines 
of growth. {Moore.) 
Ohs. Only a single, somewhat imperfect, example of this shell was seen. Its 
chief peculiarity appears to be its very high and conical figure in proportion to its size. 
'{Moore.) 
• Loc. Wollumbilla {The late Rev. TV. B. Clarice). 
Family— LINGULIDJ]:. 
Qeniis — LINGULA, Brvguiere, 1878. 
(Encyclop. Methodique, i., FI. 250, f. 1.) 
Lingula ovalis, J. Soioerhg, PI. 20, fig. 14. 
Lingula ovalis, J. Sby., Min. Cpn. i., p. 66, t. 19, f. 4. 
„ „ Moore, Quart. Journ. Geol. Soc., 1870, xxvi., Ft. 2, pp. 230 and 240. 
Ohs. The only species to he recognised amongst the Wollumbilla fossils is the 
Lingula ovalis of the Kimmeridge Clay, or the L. suhovalis of the Lower Greensand, 
which names probably refer to the same species. This shell is most abundant, as many 
as fifteen examples being visible on the surfaces of a block only two or three inches 
square. Its presence assists in uniting the faunae in several of the blocks which contain 
nothing else in common. {Moore.) 
It is very questionable if this be the species figured by Davidson under this 
name. Tate has adopted for it the name of L. suhovalis.* 
Loc. Wollumbilla {The late Rev. TV. B. Clarke). 
* Proc. Austr, Assoc. Adv. Sci. for 1838 [1889], i. j). 230. 
