255 
to the formation of an obtuse angle towards its lower third, while the anterior 
two-thirds are convex. The band of the sinus is well-marked, and placed 
immediately under the angle of the spire ; it has numerous semicircular striee 
caused by the slit of the sinus, and lines of growth. The rest of the surface 
is ornamented with innumerable longitudinal striao crossed perpendicularly 
by other striae equally numerous, and thus producing a uniform reticulated 
design. The umbilicus is very broad and deep, and the aperture transverse. 
Dimensions , — Having only an imperfect specimen of this beautiful 
species at my disposal, I cannot give the exact measurements. The specimen 
figured by Mr. J. Morris has a spiral angle of about 75°, and ought to have a 
length and breadth of about sixty-five millimetres. 
Delations and Differences . — In form and size this species resembles 
P. delphinuloides, Goldfuss ; it differs from it by its ornamentation, the 
shape of its aperture, and the narrowness of the band of its sinus. 
Horizon and Localities . — I have been able to demonstrate the existence 
of this species in the micaceous sandstone of Muree. McCoy says it is found 
at Loder’s Creek, and Morris records its occurrence in the Illawarra. 
Pleurotomaria striata, J. Sowerhy. 
PI. XXIII, Pig. 11. 
Helix striatus., J. Sowerby, 1828, Min. Concli., II, p. 159, pi. 171, fig. 1. 
Turbo ,, A. Dumont, 1832, Const. Geol. Prov. Liege, p. 353. 
,, ,, Davreux, 1833, Const. Geogn. Prov. Liege, p. 271. 
Dleurotomaria striata, J. de C. Sowerby, 1831, Indices Min. Concb., p. 217. 
,, ,, J. Phillips, 1836, Geol. Yorkshire, II, p. 226. 
D ty chomplialus striatus, L. Agassiz, 1838, Traduct. Conch. Min. de Sowerby, p. 222, pi. 
115, fig. 1, 2, 3. 
Dleurotomaria striata, L. G. de Koninck, 1813, Descr. Aniin. Foss. Terr. Carb. Belg., 
p. 399, pi. 31, fig. 2. 
,, Hainesii, P- M‘Coy, 1811, Synop. Carb. Foss. Ireland, p. 11, pi. 3, fig. 8 
,, striata, F. McCoy, 1855, Brit. Pal. Foss., p. 529. 
This is a slightly conical shell composed of five or six convex spiral 
whorls, the upper edge of which is provided with a rather projecting, nearly 
