189 
Wollongong, Mt. Gimbela, and from railway cuttings l)etween Maitland and 
Stony Creek. Mr. McCoy found it in the limestone of Black Head ; and Mr. 
J. Morris from that of Eagle-hawk Neck, Tasmania. 
Spiuipee vespertilio, G. Soiuerby} 
PI. Xlir, Pig. 4 and PI. XIV, Pig. 3. 
SpirifeTCl Tjespertilio^ Gr. B. Sowerby, 1841, In Darwin’s Geol. Obs. Vole. Islands, p. 160. 
,, ,, J. Morris, 1845, In Strzelecki’s Phys. Descr. N. S. Wales and V. D. 
Land, p. 282, pi. 17, fig. 3 (fig. 1 and 2 exclusis). 
,, ,, McCoy, 1847, Ann. Mag. Nat. Hist., XX, p. 232. 
„ ,, E. Etheridge, Senior, 1872, Quart. Journ. Greol. Soc. XXVIII, p. 329, 
pi; 16, fig. 2. 
Spirifer plialcena, J. D. Dana, 1849, Geol. Wilkes’ IT. S. Explor. Exped., p. 685, pi. 2, 
fig. 4. 
This shell is suh-triangular, and transverse, having its greatest breadth 
at the hinge area, or sometimes just below it, especially in those specimens 
with slightly rounded ears. The ventral valve is regularly curved ; its beak, 
though rather thick, is moderately recurved, and does not cover the hinge 
area. The hinge area is concave and somewhat triangular. The ventral 
furrow is not very broad, and is divided centrally by a rib rather thinner than 
those hounding the furrow. There are from eight to ten radiating, very 
angular, lateral folds, sharply separated by furrows of the same breadth ; as 
these folds recede from the ventral furrow they become slightly thieker. The 
dorsal valve is a little shallower than the ventral valve ; its dorsal ridge is 
divided by a central groove corresponding to the mid-rih of the ventral 
furrow ; its lateral folds are like those of the ventral valve. The entire surface 
of the shell is ornamented by numerous concentric strise, rather deeply marked 
on well preserved specimens, and giving rise to thin imbricated plates. By 
these plates this species allies itself to S. laminosus, McCoy ; they are well 
described and figured by Mr. J. Morris in Strzelecki’s work mentioned in the 
list of synonyms. The internal structure of the valves is very similar to that 
of the preceding species, hut the muscular impressions are less developed, 
and the cardinal process is less strong than in this last. 
1 [Mr. R. Etheridge, Junr., considers de Koninck was in error in referring the subjects of his t. 1.3, f. Ah 
and 4c, and, perhaps, also his t. 14, f. 3 to G. B. Sowerby’s species. He proposes for these forms the name 
Spirifera Stiitchhurii. Geol. and Pal. Q’land., 1892, p. 231, 232, t. 38, f. 4-6. Compare also Waagen, I’al. 
Indica, Salt Range Fossils, IV, Pt. 2, 1891, p. 130, t. 5, f. 10a, h, c, — W.S.D.] 
