499 
but if adult is distinct from any hitberto described Australian species. It is noticeable 
for the extreme simplicity of its structure, and in this respect would perhaps be 
included in the group of Aneyloceras pulcherrimus, D’Orb.* 
The name is proposed in honour of my old Priend and former Colleague, Mr. 
Norman Taylor. 
Loc. Head of the Walsh River f (Colin. Queensland Mus.). 
Genus— CBIOCHEAS, LeveilU, 1873. 
(Mem. Soc. Geol. France, ii., p. 313.) 
Ceioceeas austeale, Moore, sp. 
PL 30, fig. 7 ; PI. 31, fig. 1 ; PL 32, figs. 1-4, ? 5 ; PL 33, fig. 2. 
prioceras australe, Moore, Quart. Journ. Geol. Soc., 1870, xxvi., p. 257, 1. 15, f. 3. 
,, „ Waagen, Pal. Indica (.Jurassic Fauna of Kutch), Cephaloijoda, 1875, i., Xo. 4, p. 24G , 
t. GO, f. 1, a-c. 
„ Jaclcii, Etheridge fil., Proc. R. Phys. Soc. Edinb., 1880. 
,, australe, Ten. Woods, .Journ. R. Soc. N. S. Wales, 1882, xvi., p. 152, t. 10, f. 5 and G. 
,, ,, Ratte, Proc. Linn. Soc. N. S. Wales, 1886, i., p. 133, tt. 1 and 2. 
Compare Crioceras irreyular’e, Ten. Woods, Ihiil,, p. 1.51, t. 8, f. 2.] 
Sp. GJiar. Shell attaining a very large size, with the whorls massive, hroad, close 
but not touching, from six to eight in number, the first two or two and a-half whorls 
tuberculate ; back xevj convex : round or slightly flattened at the sides ; dorsal or inner 
side flat or concave ; section routiclly deltoid ; siphuncle of medium size for that of 
the shell, immediately below the outer test on the back ; septa thick and strongly 
developed, almost flat in the centre ; the ventral or siphonal saddle is short in propoi’- 
tion to the inferior lateral saddles. The latter are divided into two strong main 
branches, each again bifurcating. The second inferior lateral saddles appear to be of 
equal length with the first, and of similar construction. The ventral lobe is deep, with 
short branches on each side the dorsal saddle; the dlgitations are numerous ; the costse 
showing, and very well developed, horizontal on the ventral side or back, slightly 
sigmoidal on the flanks, and concave forwards on the dorsal side ; simple, or bifurcating, 
when the latter, consisting of a primary rib, and a subsidiary one at its side, tuberculate, 
in the young state ; in the latter condition the primary costse are of two sizes, the non- 
tuberculate ribs being all of one size, whilst those bearing the tubercles are larger, and 
separated one from the others, sometimes by two and sometimes by three of the former ; 
costse in tlie young shell close together, contiguous, but gradually widening out with age 
and becoming separated by wide rather concave sulci, which become wider still as the 
mouth is approached ; tubercles blunt and node-like, arranged in six rows, two on each 
side of the flank and two on the back, those on the sides becoming less apparent, and 
disappearing about the end of the second volution ; test striated parallel to the costse. 
Ois. Through a fine series of specimens forwarded to me by Mr. C. De Vis, 
supplementing additional ones collected by my Colleague, I am able to trace this species 
from a comparatively young state (PL 30, fig. 7), in which the tubercles ai’e present as 
little fine nodes, up to the fine specimen figured on Plate 31, of half the natural size; 
and further, to show that in all probability Moore’s O. australe and 0. Jaohii (mihi) 
are identical. 
As originally described, O. Jaclcii was known either from the inner tuberculated 
whorls of larger and older specimens, or from young individuals in which the tubercles 
Were very pronounced. In the latter condition the costse are close, sharp, and 
* Pal. Franc. Terr. Cret., i., t. 121, f. 3. . , , , , 
+ The head of the Walsh River is in Pateozoio and Plutonic rooks. The locality is probably lower 
down th e Walsh . (Jt.L.J.) 
