ialontolngia ndita,

FAUNA OF KACHH (CUTCH).
261
(=R. s,inmanni Lemoine) is :far less closely comparable and may not
:eve;n ,belong to the same group . .
.
R,. nodosa Till (1910, pl. XIX, figs. 4-6), 1911, p. 4) is. more coarsely
n})bed:- than the small . example here figured, but is difficult to compare with
the . large holotype on account of difference in size. R. indosabauda has a
far less strongly tuberculate early stage and more numerous secondaries than
the species here described ; its ribs also show a distinct bend at the lateroperipheral
edge and the external saddle of its suture-line is more slender.
H orizon.-Callovian, . lower anceps beds, rehmanni zone.
Locality.-Khera Hill, bed No. 6 (J. H. Smith Colln.) The smaller example
(pl. XXXIV, fig. 5} is unlocalised.
REINECKEIA INDOSABAUDA, Parona and Bonarelli.
1875. Perisphinctes rehmanni (non Oppel) Waagen, p. 206, pl. LVIII, figs. I, la, lb.
1897. Reineckeia indosalxwda Parona and Bonarelli, p. 160.
1905. Ammonites indosabauda (Parona and Boriarelli) ; Collot, p. 26 .
. 1910. Reineckeia indosabauda P rori.a and Bonarelli ; Lemoine, p. 9.
The two Chanaz examples quoted by Parona and Bonarelli have the
follow'ing · ' difuension:s· :-
-. i
(I)
(II)
132-·3o-· 3o-·45.
s 195-·28-·30-· 50.
t 25o--26-·3o-:--·52.
In the Kachh fragment, the thickness, calculated . to a diameter of appro
ximately 185mn ., works out at about. 38%, so that the whorls seem to
be more depressed than in the Savoy specimens identified by Parona and
Bonarelli with the Indian holotype. They also describe the whorl-section as
nearly circular, whereas in the Kaehh example the sides and periphery are
:slightly flattened and the ventro-lateral edges
horl-section a suboctagonal outline.
There . are only
are distinctly bevelled, giving the
three doubtful, small, additional fragments that may belong
to the present species, but they are not sufficiently well preserved to be figured.
It· is probable, however, that the inner whorls are essentially like those of
R. arthritica and · R. sp. nov. 1 aff. brancoi above described, only more delicately
ornamented and . with. about 8 ·.to 10 · secondary ribs to each tubercle already
at · a diameter of 80-90m'm. There are thus considerable . differences from the
form figured by Loczy (1915, p. 362, text-fig. 81} as R. rehmanni, which was
identified not : only with · R. substeinmanni, . but also with the pre:;;ent spechs.
It · is not certain, however, that the s.mall fragments belong to the same form
as· the holot}rpe.
In any case it .is important to note that there . is an indication
of a sudden change in the ornamentation of the latter . at a. diameter
.oi about 80mm. Before the constriction at which this abrupt cha,:tge takes
pla, th· ornamentation seems to be, that of . an ordinary Reineckeia of the
.Jnore ·or less· ·depressed ' anceps '
type.
P2