103 
Horizon and Localiltj. — The only specimen of this species found up to 
the present comes from the Yass District, where it was collected hy the Eev. 
Mr. Clarke in a black argillaceous limestone. 
Genus — NATICA, Lamarck. 
Natica cirrifoumis, Soiverbjj. 
Turbo cirrlformiSf Sowerby, ISiO, Trans. Geol. Soc. London, V (2), pi. 57, fig. 20. 
I do not think I am wrong in transferring to the genus Natica this 
small shell, classed hy Sowerby as Turbo, of which it seems to me it possesses 
none of the characters. It is snhglohose, composed of five to six spiral 
whorls, of which the last is largely developed, while of the earlier ones only 
a small portion of the surface is visible. The spire is conical and the spiral 
angle is about 100°. The whorls of the spire are rather convex, and clearly 
separated from one another hy a well-marked linear suture. The aperture is 
SLihsemicircular. The surface is quite smooth. 
Limensions. — Length, ten millimetres ; diameter, about eight milli- 
metres. 
Lelations and, Liffcrcnces . — It is not always very easy to distinguish 
between the small Palaeozoic species of this genus. This one, however, differs 
from Natica Lonti, antiqua, and effosa, Goldfuss, in the entire absence of the 
striae with which the surface of those species is ornamented, and, besides, in 
the angle and elevation of the spire. 
Horizon and Localities . — In England it occurs in the Devonian beds 
of Plymouth, and in Australia in those of the Yass District. 
CEPHALOPODA. 
Order — TETRABEANCHIATA. 
GONIATITES, de Haan. 
Goniatites Woodsii, L. G. de Koninck. 
PI. lY, Pig. 15. 
Shell rather small, slightly compressed laterally, rounded on the hack 
and as seen from the front of ellipsoidal outline. Surface quite smooth. 
Spire entirely enveloping and leaving no trace of an umbilicus ; a small 
