261 
for the same length the diameter of the Devonian Murchisonia is relatively 
less than that of the Carboniferous species. The absence of the third keel on 
the whorls makes it impossible to confound this with the preceding species. 
Horizon and Localities . — This species is rather rare in the Upper 
Carboniferous Limestone at Vise. It was found in a dark grey limestone at 
Munawarra (Black Head). 
Genus — EUOMPHALU S, Sowerhy. 
Euomphalus oculus, J. J). 8oioerhy} 
PI. XXIII, Pig. 18. 
TrochllS oculus, J. D. Sowerby, 1838, In T. L. Mitchell’s Three Exped. Interior E. 
Austr., I, p. 15, pi. 2, fig. 3, 4. 
Llatyscliisuia oculus, J. Morris, 1845, In Strzelecki’s Phys. Descr. N. S. Wales and V. D. 
Land, p. 28G, pi. 18, fig. 1, 
„ ,, E. McCoy, 1847, Ann. Mag. Nat. Hist., XX, p. 306. 
,, ,, J. D. Dana, 1849, Geol. Wilkes’ U. S. Explor. Exped., p. 707, p. 10, 
fig. 1. 
This is a rather large, suborbicnlar shell, with a short, depressed spire, 
composed of four or five slightly convex whorls, the last of which is well 
developed and obtusely keeled towards its nj)per margin. The sutures are 
shallow. The aperture is oblique, nearly circular, and shows only a slight 
angularity from the side of the lower canal joiniog the suture of the last 
whorl. The columella is simple and rather thick. The nmltilicus is deep 
but not large. The upper part of the last whorl is convex. The whole 
surface is ornamented with oblique lines of growth, slightly wavy towards the 
keeled part of the base. The shell is fibrous. 
Dimensions. — It is capable of reaching large dimensions. The sj)eci- 
men figured by Strzelecki was about five centimetres long by seven broad ; 
that figured by Dana is larger but slightly deformed. 
Melations and Dijferences. — In shape this species resembles E. 
helico'ides, Sowerby, and could easily be confounded with it, it difi^ers by the 
* [Platyschisma oculum. Vide E. Etheridge, Junr. , Geol. and Pal. Q’land., 1892, p. 286, t. 15, f. 3, 4 ; 
Records Geol. Survey N. S. Wales, 1898, V, p. 176, t. 19, f. 14-17 — W.S.D.] 
