MansHaALL—Two Fossil Cephalopods from North Canterbury. 615 
Two Fossil Cephalopods from North Canterbury. 
By P. Мавѕнли,, M.A., D.Sc., F.G.S., F.N.Z.Inst, Hutton and Hector 
Medallist. 
[ Read уба the dryer Таоа of Canterbury, 5th December, 1923 ; : received by 
24th December, 1923 ; issued. separately, 28th August, 192 4.) 
Plates 63, 64, 
Proressor В. Speicut has been good enough to give me two fossil 
specimens, recently found in the Hurunui country, for ачаг gst 
and description. One of them was found in the Hurunui Rive r 
Ethelton, and its origin is unknown so far as exact site is concerned, 
This specimen is an ammonite quite different from any species that 
has 77 been found in New Zealand. А description of it is given 
below 
DarMasicERAS Djanélidzé, 1922. 
A ies description of this genus is given by its author (256-62, Bull. 
G.S. de France, ser. 4, vol. 21, 1923). The following is an abridged 
Whorls in adult form very flattened, but since whorls wider than 
high. There are usually umbilical tubercles cept in very young or 
very old forms. In some forms ribs may be fasci culated from umbilical 
bercles. Манайх there are primary ribs which originate on umbilical slope 
or on tubercles. About half-way along flank secondary ribs arise, two or 
lobe formed from the summit of the second lateral saddle with its secondary 
lobe and the auxiliary lobes. First lateral lobe very large and unsym- 
metrical ; of its two lateral branches the external is the larger. The lobes 
and saddles are long and straight. The summit of the principal saddles 
- is symmetrically divided by a secondary lobe. The antisiphuncular lobe 
is straight, deep, "s impaired. The genus is — restricted to 
the Upper Tithonia: 
 Dalmasiceras speighti n. sp. (Plate 63, figs. 2, 3; Plate 64, figs. 1, 2.) 
The shell is of moderate size, but is too imperfect for exact measure- 
ment at a greater diameter than 51 mm. Its dimensions (in millimetres) 
are— 
A. 
Diameter .. 51 100 85 - 
Height T^ 45 35 41 
Width pur eee: 2 17 
20 
Umbilieus .. 17 33 26 31 
It is thus not very different in form from D. kiliani Djanélidzé, though 
distinctly wider and lower, a difference that might well be due to the 
larger size of the latter specimen. The involution is about one-half, Sess 
