FOSSILS OF NEW SOUTH WALES. 683 
The 7: elongata, as figured by Verneuil in his Russian Paleontology, Pl. ix, fig. 9, 
does not appear to differ essentially from our species, except that the Australian speci- 
men has greater thickness for its length. The hezght is 1 inch; length ji H.3 thick- 
mess 55, H. The cardinal edges of the smaller valve are quite sinuous, in an end view 
especially, and are concave either side in a direct view. The shell is smooth, with a few 
delicate concentric furrows. The valves are about equally and regularly convex, and 
have the greatest thickness about the centre, Cardinal angle near 70°. Beak reflexed 
close to the apex of the smaller valve, and aperture round and large. The punctations 
in the internal texture (figs. 3 c, d) are in linear series, and hardly larger than in the pre- 
ceding. 
3, TEREBRATULA ? Plate 1, fig. 4 a, b, different views, natural size. District of 
Illawarra. 
The specimen from which this figure was made was lost before a description was 
drawn up. It may be a young state of the 7. amygdala, It also resembles the P. 
virgo of Phillips (Pal. Foss. p. 91, pl. 35, fig. 167). 
4, Ternpratuta ?—Plate 1, fig. 5. This figure represents a small shell from Glen- 
don, altered in shape by compression. The surface is smooth, without striae, but slightly 
concentric undulate. 
5. SprrIFER GLABER.—Plate 1, fig. 6; a, b, specimen from Black Head, Illawarra, 
natural size; c, 7, specimen from Harper’s Hill, natural size ; e, f, distorted specimen 
from Harper’s Hill; g, surface of figure 6 c, magnified 3 diameters. 
Black Head, Illawarra and Harper’s Hill. 
Specimens from Harper’s Hill are usually rather thicker in proportion to the length, 
and are less distinctly subradiate, especially when small. These smaller specimens (figs. 
6 c, 6 d) have also a deeper medial sinus, and a more abruptly prominent fold to the 
opposite valve. ‘They have distinct concentric ridges of growth, and the exterior sur- 
face is longitudinally marked with minute short lines, giving it, under the lens, a kind of 
fibrous appearance. The layers beneath appear as above stated. ‘The larger specimens 
from this locality are closely like those of Illawarra. 
Two individuals among our specimens from Harper’s Hill are obliquely distorted as 
shown in figures 6 e, 6 /. 
This species was briefly described by G. Sowerby as the Spzrifer subradiata from a 
Van Diemen’s Land specimen. Morris, in Strzelecki’s work, says that it is abundant at 
Mount Wellington, Van Diemen’s Land, where some individuals are four inches in 
breadth ; and that it occurs also at Glendon on the Hunter. M’Coy mentions Darling- 
ton, New South Wales, as another locality. 
The specimens from Illawarra agree with the figures plate 15 and 16, in Strzelecki’s 
New South Wales. The apical angle is about 106 degrees ; height (from the beak to the 
opposite margin) 27 inches; length 1:06 H.; thickness 0°56 H. The surface is faintly 
and unevenly subradiate, with some irregular concentric lines of growth. The shell, in 
calcareous specimens, often shows a tendency to peel off in layers, and thin fragments 
under the microscope have a somewhat fibrous appearance. In worn specimens the 
internal spires are often shown, and the convolutions towards the middle of the shell are 
from a line to a sixteenth of an inch apart. The medial depression of the dorsal valve 
is very broad and concave, and not deep. 
