501 
Loc. Upper Maranoa District (The late Rev. W. B. Glarhe) ; Tate Diver (A, O. 
Macmillan')-, Walsh Diver (lion. A. G. Gregory aud Queensland Museuin ) Palmer 
Diver (The late Rev. J. E. T. Woods) ; Landsborough Creek, Thomson Diver (Prof. A. 
Liversidge ) Wollumbilla (G. Sweet — Colin. Sweet, Melbourne) ; Maranoa Diver, about 
one mile north of Mitchell Bridge (Q. Sweet — Colin. Ibid.). 
Ceioceeas ieeegulaee. Ten. Woods. 
PI. 33, fig. 1 ; PI. 42, fig. 16 ; PI. 32, fig. 5 ?. 
Grioceras irregulare, Ten. Woods, Journ. R. Soc. N. S. Wales, 1882, xvi., p. 161, t. 8, f. 2. 
Sp. Char. Shell loosely and irregularly coiled; whorls one and a-half, quite 
free, but the distance irregular, much compressed at the sides ; tuberculate in sixteen 
rows. The first six obsolete, tubercles, three on each side, conical, short, close on the 
sides, but at an interval on the dorsal edge, then disappearing except that a faint 
row seen near the end of the fragment after a long interval. Costas of two sizes, 
the tuberculate ones large, and separated from one another by simple, narrow, round, 
undulating ribs, which vary in number between the tubercles from two to thirteen. 
(Ten. Woods.) 
Obs. The above description is quoted from the late Dev. Mr. "Woods’s Paper 
word for word, and with identical punctuation. The latter, in the second sentence, 
seems to have become misplaced, because the sense and meaning of the paragraph does 
not appear to be continuous. 
The figure of this species certainly represents a more loosely coiled shell than 
G. australe, but nevertheless “the resemblance between the form of the cost® and 
arrangement of the tubercles is so conspicuously alike that a connection between the 
two cannot but be suspected. The original figure is given in PL 33, fig. 1, and here 
will be noticed the apparent tapering termination, or rather commencement, or nucleus, 
of the shell, this free and open state being quite different to anything yet noticed in 
G. australe, the initial portions of which are represented in PI. 30, fig. 7, and PI. 32, 
fig. 1. There are two, three, four, and six costa3 at times between the larger node- 
bearing ribs, and these seem to occur irrespective of order (PI. 33, fig. 1). This is the 
case in O. australe, and, as in that species, the nodes cease suddenly, and are confined to 
a limited portion of the surface only. Two very prominent nodes occur on the back 
(PI. 42, fig. 16), one at each side, immediately below those (PL 42, fig. 16), and one or 
two on each flank (PL 33, fig. 1). Compare with this the ornamentation of 0. australe 
(PL 32, figs. 1 and 2). The specimen referred to G. irregulare, from the Walsh Diver 
(PL 42, fig. 16), has the peculiarly flattened appearance, on its inner or concave side, 
which generally results from the close contiguity of another whorl, and therein still 
more indicating its probable relation to 0. australe. 
As figured by Mr. Tenison Woods, G. irregulare is decidedly after the type of 
Grioceras latus, G-abb,* both in the enrolment of the whorls and form of ornament, but 
in Gabb’s species the larger prominent ribs are farther apart. 
Loa. Palmer Diver (The late Rev. J. E. T, Woods); Head of Walsh Divert 
(Hann's Expedition — Queensland Museum) . 
* Pal. California, t. 15, f. 25. 
t The head of the Walsh River is in Paleozoic and Plutonic rocks. Probably the true locality is 
further down the river. {S.L.J.) 
