FOSSILS OF NEW SOUTH WALES. 685 
angular, but has a furrow along the middle, and a small ridge in the corresponding 
depression in the other valve. 
9, SPIRIFER VESPERTILIO (G‘. Sowerby).—Plate 2, figs. 3 a, b, c, natural size. 
Black Head, District of Illawarra. 
The length of our specimens of this species is 33 to 4 inches, which is 2 to 23 times 
greater than the height. ‘The specimens agree with the figures in Strzelecki, (plate 17, 
figs. 1 and 2,) whose specimens were from Eagle Hawk’s Neck, Van Diemen’s Land. 
The cost are variable in number. In one specimen there are ten or twelve either side 
of the mesial fold, in another six to eight, and the rest exterior to these are obsolete. 
There are three small ribs in the mesial depression, besides an obsolescent one either 
side. The mesial fold of the other valve is very broad and rounded, and somewhat 
costate. 
Figure 3, c, resembles the figures of Spirifer avicula, (G. Sowerby,) a species cited 
from Eagle Hawk’s Neck, Van Diemen’s Land, and also by M’Coy from Korinda and 
Black Head, New South Wales. But it does not appear to differ specifically from 
figures 3 a, 3 0. 
Spirifer vespertilo, G. Sowerby, in Darwin’s Volcanic Islands, p. 160. 
, J. Morris, in Strzelecki’s New South Wales, p. 282, pl. 17, figs. 1 and 2. 
, M’Coy, loc. cit., p. 232. 
Spirifer antarcticus [2], J. Morris, Quart. Journ. Geol. Soc., of London, ii. 276, pl. 11, fig. 2. 
10. Sprrirer pHALZNA (Dana).—Elongate, nearly twice as long as high. Cardinal 
margin straight and much elongate. Mesial fold large and subangular, divided along the 
middle. Coste about twenty-four, neatly triangular and subacute, transversely striate, 
the strize (of growth) regularly parallel. Plate 2, fig. 4, portion of a valve. 
District of Ilawarra. 
Our specimen of this species is but a fragment. A perfect specimen is figured by 
Morris in Strzelecki, (pl. 17, fig. 8,) and referred to the vesperti/io. The length of the 
upper margin in his figure is 8g inches; height, 1g inches. The shell diminishes in 
length from the upper margin downward. ‘The coste are very neatly triangular and 
prominent, and those near the mesial fold are about 4 or 2 of an inch across. 
Spirifer vespertiho, J. Morris, in Strzelecki, pl. 17, fig. 3. 
11. Srponorrera ? curta (Dana).—Very short ovate, hardly higher than long ; beak 
acute, and apical angle a right angle or less. Surface smooth, concentrically subplicate.-— 
Height and length about 7 inch.—Plate 2, fig. 5, a, 6; natural size. 
Glendon, valley of the Hunter. 
Like other specimens from Glendon, this specimen is much injured by compression. I 
have been unable to ascertain, from the specimens examined, whether the shell has the 
perforation of Siphonotreta or not. The plications are few, irregular and low. Beneath 
the beak, the surface is flat. The beak itself is quite thin, and projects far beyond the 
- hinge line. 
12, Linevta ovata (Dana).—Quite small, much convex, regularly broad ovate, with 
the front margin not at all truncate. Beak acute. Valves thin, smooth, with faint con- 
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