207 
Dimensions. — The length is forty-three, the breadth and thickness 
twenty-six, millimetres. 
Delations and Differences. — This species differs from those preceding 
hy being small and ventricose. It is closely allied to the small variety 
S. variahilis, McCoy (Palaeoz. Possils, PL P3, Pig. 7 and 8), which is the 
same as the Tonrnai Sanguinolites figured by me as S. omalianus ; it differs 
from it by the form of its concentric wrinkles, by its relatively greater 
thickness, and above all by the absence of the depression towards the posterior 
side. I have dedicated it to the learned Director of the Melbourne Museum, 
to whom we owe numerous descriptions of the Silurian and Carboniferous 
fossils of Australia. 
Horizon and Localities. — A single specimen was found in the Wollon- 
(jong sandstone. 
Sanguinolites curvatus, J. Morris. 
PI. XVII, Pig. 4. 
Allorisma Clirvatum, .1. Morris, 1845, In Strzelecki’s Phys. Descr. X. S. 
"Wales and V. D. Land, p. 170, pi. 10, fig. 1. 
,, ,, P. McCoy, 1847, Ann. Mag. Nat. Hist., XX, p. 300. 
Dlioladomya [Homomya) curvata, -I. D. Dana, Geol. Wilkes’ IJ.S. Explor. Exped., p. 688, 
pi. 3, fig. 2. 
This is a large, oblong, very inequilateral, gibbous, shell, suboval in 
contour. Its anterior margin is rounded, its ventral margin slightly sinuous 
towards its anterior part, and its anal margin obliquely truncated, gaping, 
and also a little sinuous. The beaks, situated very anteriorly, are inflated, 
recurved, and very close together. The exterior ligament is very large ; the 
whole external surface is covered with irregular, concentric, wrinkles of 
growth, crossed by some scarcely perceptible, radiating lines. According to 
Mr. J. Morris the impression of the posterior adduetor muscles is very distinct, 
while that of the anterior adductors is scarcely visible. 
Dimensions . — The length is ten, the breadth eight, and thickness six, 
centimetres. 
Delations and Differences. — This species is easily distinguished from 
all the preceding by its size, its more rounded form, and by the relations of 
its different dimensions. 
