226 
the late Dr. T. Daviclson * * * § this shell is probably one of the largest of the Upper 
Pateozoie Terebratulm known. The British specimen measures two and three-quarter 
inches in length, two inches in breadth, and one and a-half in depth. The Fosent she , 
on the contrary, is two and a-half incl.es long, and two inches in breadth but the deirth 
is reduced to a quarter of an inch. In the high shoulders of the Tentral valve, and size 
and position of the foramen, there is a strong resemblance to D. Daua.T 
But the lateral margins in this species are much curved coiieavely, not sigmoidally, and 
the front margin was probably entire. The curvature of the shell m the present species 
is well displayed both in Morris’s and Be Koninck’s figures, whilst in the former are also 
shown the impressions of the strong dental plates, equally well seen in our specimen. 
The form of the foramen is likewise well preserved, even to the entire mar^n. 
Loc. and Horizmi. Mouth of Coral Creek, Bowen Biver Coal Pield {K Edelfelt) 
— Middle or Marine Series of the Bowen Biver Coal I'ield. 
Dielasma. saccules, Martin, var. 
Condi. (Anomites) sacculus, Martin, Pet. Derb., 1809, p. 14, t. 40, f. 1 an<J 2. . „ „ . ^ oq 
Tei-cbratulasacculm, Davidson, Mon. Brit. Garb. Brach 1857, Pt l,p. 14, t. ^f. -3 24, ^> 29. 30^ 
Dielasma saoouliis, De Koninck, Panne Calc. Garb. Belgique, 1887, Pt. 6 , p. 27, t. 6, ff. 14 17, 1.1 Z , 
t. 7, f. 00-77. 
Sp Char. Shell obovate, depressed, concavo-convex, especially towards the 
front, which is not sinuated. Ventral valve depressed, convex, becoming flat and 
naiwowed towards the front. Dorsal valve convex immediately below the ^mDOii > 
becomes flattened, and then concave as the front is approached. Length, two inches an 
three-quarters; breadth, one inch and three-quarters. 
Ohs. The depressed boat-shaped outline, and its extreme shallowness as compared 
with its length and breadth, are very marked features in this .shell. The suriace o e 
ventral valve carries a few indistinct concentric furrows. The lateral marginal curve ot 
the valves is very slight. In outline we here have a distinct resemblance to the little 
variety termed by Davidson gillengensis,X but the great difference in size will at once 
distinguish our shell. /tt nr • 
Loc. and Rorizon. Banana Creek, near Banana, Dawson Biver (JR. Mackay , 
Colin. De Vis) — Middle or Marine Series of the Bowen Biver Coal Field. 
Dielasma sacculus, var. hastata, J. de C. Sowerhy. 
Terebratula hastata, J. de 0. Sby., Min. Con., 1824, v., p. GO, t. 440. 
Davidson, Mon. Brit Garb. Brach., 1857, Pt. 1, p. H- 1. 1, ff. 1- • pt q o 2-57. 
„ saoeidus, var. hastata, De Koninck, Reoh. Foss. Pal. Nouv.-Galles du bud, 1877, Pt 3, p. 
Dielmma hastatum, De Koninck, Faune Calc. Garb. Belgique, 1887, Pt. 0, p. 9, t. 3, ff. 1-20, rtc. ^ ^ 
Ohs. A single, small and wmrn, but almost complete example of this va,riety o 
the above protean species has been met with. There seems to be little or no sinuosi 
in the front margin, the ventral valve is very much flattened, and the dorsal valve m 
arched. Beyond the general outline there are no characters which can be seize P 
Loc. and Rorizon. Bockhampton District § (C. W.De Vis; Colin. De Vis) 
Gympie Beds. - 
* Mon. Brit. Garb. Brach., 1880, iv., Pt. 3, t. 30, f. 17a and b. 
t Geology Wilkes’ U. S. E.vplor. Exped., 1849, x.. Atlas, t. 1, f. 3a.. 
X Davidson, loc. cU., p. 17, t. 1, figs. 18-20. 
§ See note, p. 199. 
