ialontolngia ndita,

186 REVISION OF THE JURASSIC CEPHALOPOD
· speCies are thus altogether too doubtful for accurate identification or companson.
Waagen, and after him R. Etheridge Jr. (1890, p. 176), united Sowerby's
type with Amm. grantanus, Oppel, but it will be shown below that there has
been confusion of ·two entirely different forms.
Horizon.-Lower Callovian, diadematus zone.
Localities.-Khera Hill. Even the unlocalised specimens, by their Golden
·Oolite matrix, can be taken to come from Khera, and two examples in Mr.
J. H. Smith's Collection are labelled bed No. 5. This is above the Golden
Oolite (Smith, 1913a, p. 210) but is here included in the diadematus zone.
INDOCEPHALITES CHRYSOOLITIDCUS (Waagen).
·{Pl. XXI, figs. 6a, b, pl. XXIV, fig. 7, pl. XXV, fig. 1, pl. XXVI, fig. 6).
1875. Btephanoceras chrysoolithicum W aagen ; p. 175, pl. XXX, fig. 1.
1878. Stephanoceras chrysoolithicum Waagen ; Gottsche, p. 42.
(1) 1881. Stephanoceras chrysoolithicum Waagen ; Steinmann, p. 270, pl. XI, fig. 3.
1885. Macrocephalites chrysoolithicus (Waagen} ; Nikitin, p. 51.
1894. Macrocephalites chrysoolithicus (Waagen} ; Tornquist, p. 25.
1897. Macrocephalites chrysoolithicus (Waagen} ; Parona and Bonarelli, p. 148.
1910. Macrocephalites chrysoolithicus (Waagen} ; Lemoine, fig. 28, p. 21, p. 29.
1914. Macrocephalites chrysoolithicus (Waagen) ; R. Douville, p. 363.
1924. Macrocephalites chrysoolithic_us (Waagen) ; Spath, pp. 7 and 22.
{} 1924. Macrocephalites chrysooithicus (Waagen) ; Stehn, pp. 77 and 147.
1925. Pleurocephalites chrysoolithicus (Waagen) ; Spath, p. 14.
(1) 125. Macrocephalites chrysoolithicus (Waagen) ; Gerth, p. 33.
() 1926. Macrocephalites cf. chrysoolithicus (Waagen) ; Kruizinga, p. 55, pl. IV, figs. 1-2.
This form was well characterised by Waagen's figures and description,
-but it is very doubtful whether authors have correctly interpreted it.
Thus
Steinmann's involute and inflated form, wrongly stated by Lemoine to be very
· ·close to Kamptokephalites grantanu.s (Oppel), differs very considerably in proportions,
but was only recently again referred by Stehn to Waagen's species.
Nikitin considered his JJ1acrocephalites pila, which is close to Pleurocephalites
folliformis, Buckman, to be intermediate between the more inflated P. tumidus
and the more compressed Kachh form. His interpretation of I ndocephalites
chrysoolithicu.s, however, was probably influenced by Steinmann's figures, of
which ' 111 acrocephalites ' zirkeli (not zieteni, as Nikitin writes) is still less closely
related to the present species.
Lemointl united I. chrysoolithicus with 'J.lfacrocephalites
' grantanus (Oppel), but the former agrees neither with the French
Kamptokephalites of the herveyi group to which the name grantanus must he
restricted, nor with the more involute Kachh species, to which W aagen had
-erroneously applied Oppel's specific name.
Parona and Bonarelli objected to Waagen's placing of the present species
in his ' recticostati '
since by the very obvious bend of the ribs where ·they