ialontolngia ndita,

FAUNA OF KACHH (CUTCH). 263: ·
it may only be an extreme form of the indosabauda-rehmanni group, above
described, with the ribbing ·unusually close in the vicinity of the mouth-border.:
H orizon.-Callovian, anceps beds.
Locality.-Khera Hill, bed No. 7 (J. H. Smith Colln. No. 13 A) .
REINECKEIA SMITHI sp . . nov.
•
(PI. XXVII, figs. la, b).
1913. Perisphinctes anceps Waagen ; Smith (a), p. 211.
The holotype of this species, complete to the mouth-border, has dimensions
:-15o-· 34-·29-·42. These are not unlike those of various other forms
of Reineckeia ; and considering the large number of types already in existence,
it may seem unnecessary to create a new species for the Indian examples.
here described. I had, at first, . considered the present form · to represent,
perhaps, the Indian equivalent of d'Orbigny's Amm. • anceps ' (=R. substein- ·
manni, Lemoine) as interpreted by e.g., Petitclerc (1915, p. 90) ; but comparison
with actual specimens shows that the two species cannot be united. The·
dimensions of a magnificent French example (B. M. No. C. 13925), with over
ha:If a whorl of body-chamber, are :-166-·32-·35-·47, as against 181-·3o-·36··
-·48 in d'Orbigny's idealised drawing. The form here figured is not only
more compressed and more involute, but it differs chiefly in the degeneration .
of its tubercles and ribs on the body-chamber ..
On the inner whorls, the ornamentation is that of R. arthritica, as represented
in pl. XXXIII, fig. 2, but more delicate ; and the tuberculation increases,
if somewhat irregularly, to a diameter of about 80mm. Then, there
is an untuberculate primary, rib, forming .a sharp ridge, followed by a single
costa and constriction, and after three more prominent rounded tubercles
(with five to six secondaries each) the ribbing becomes altogether irregular
and the tubercles on the primary ribs, if present at all, become small or
elongated. The whorl-section shows a corresponding change from that of
R. substeinmanni po the compressed type of Reineckeites. The peripheral
furrow is well-marked at the beginning of the outer whorl but tends to become
effaced near the aperture ; the suture-line is seen only in small portions on
the inner whorls.
R. robusta, Till (1910, pi. IV, figs. 8-9, 1911, p. 6) has similar dimensions
at a smaller diameter, but different ornamentation and is not so comparable
as might be assumed from its description as transitional between the anceps
and greppini groups.. Till considered it to be close to R. kiliani Parona and
Bonarelli, identified with Amm. micromphalus Quenstedt (1886, pl. LXXX.
fig. 4) which is said to be badly drawn but which looks like a Neuqueniceras.
Yet Till (p. 2) calls Steinmann's R. lijolensis another • passage form,'
though this belongs to a different group and like the present species, has a
more • coronate ' early stage. Reuter (1908, p. 120) was probably right in
including R. lifolensis in the true R. anceps ; and Petitclerc's (1915, p. 97)
small examples, like Bukowski's (1887, p. 132) Polish specimens, may welL