270 
that it belongs to the first of these genera, as I know of no Belleroplion in 
the state of a cast that does not preserve some very appreciable trace of the 
hand of the sinns with which the dorsal part is furnished ; hut no trace of 
it is seen on this si^^ecimen. But all the specimens show transverse furrows, 
very wavy on the anticolumellar part of the shell, exactly like those on the 
surface of many Goniaiites — see those described and figured by J. Phillipsd 
I am also much inclined to think that G. micr omphalus is the same as 
same Author’s G. micronotiis. In any case the difference between these 
Australian specimens and that figured by the learned Professor of Oxford is 
so slight that it would be difficult to put it into vrords. G. {Belleroplion) 
midulata, Dana, seems to me only a G. micronplialm with more pronounced 
transverse furrows. 
Horizon and Localities. — This was found in the Illawarra (Morris), 
and in the Muree Sandstone, where it is rather common. 
Goniatites ST rictus, J. B. Dana. 
Belle7'ophon striclus, J. D. Daua, 1S17, Am. Joum. Sci., IV (2), p. 151. 
,, ,, Idem, 1819, Geol. Wilkes’ U. S. Explor. Expect, p. 707, pi. 10, fig. 5. 
This is a rather small, discoidal shell, depressed laterally, with a 
rounded back. All the spiral whorls envelope each other, and produce only a 
small umbilicus the margins of which are slightly raised and form a broad 
funnel. The aimrture is higher than broad, and deejily hollowed behind by 
the whorl of the spire. The surface is quite smooth, and I can find no trace 
of striae. The septa are unknown. 
Dimensions . — The diameter is eleimn, and the thickness five, milli- 
metres. 
Belations and Differences. — This species differs from the preceding by 
the absence of all trace of ornamentation, by its less relative width, and by 
the depression of the lateral parts. 
Ilorizoti and Localities. — Dana found this at lAollongong, and Clarke 
in a black limestone at Harper’s Hill. 
' Geol. Yorkshire, II, pi. 19, figs. 1, 4, IG, 17, 22, 2G, 33, 34. 
