ialontolngia ndita,

FAUNA OF KACHH (CUTCH).
223:-
respectively, are here attached to stocks that are not represented in Kachh,
but the rare Pachyceratidre described above are probably similar immigrantsfrom
more northern seas if not actually the 'Boreal Province' in Neumayr's
sense. The resemblance to the earlier families is thus taken to be accidental
and due to similar conditions of existence, and the Mayaitidre are held to be
equivalents of the family Cardioceratidre, so well developed in the non-equatorial
provinces.
The genus Mayaites was based on M. maya (J. de C. Sowerby), but
in its original connotation it comprised a variety of forms which it seems
advisable to exclude, now that abundant new material and Waagen's types .
are available for study. Mayaites is thus now restricted to the group of
M. maya (Waagen) which includes some new species here described, one of
them (M. subkobyi, sp. nov.) transitional to Tornquistes, and the form (M.
obesus, sp. nov. ) wrongly referred by Sowerby to Amm. herveyi. All these
are characterised by their generally blunt ribs, passing straight across the ·
broad periphery, and by a more or less serial, unprojected suture-line, with
great resemblance to that of the earlier Macrocephalitids.
Whether the East African forms of the olcostephanoides group belong to the ·
restricted .Z:layaites seems doubtful. The undescribed species previously re
corded (1924, p. 10) from Mombasa as transitional in shape and ornamentation
between 'M.' olcostephanoides (Tornquist) and Dhosaites, the suture-line
of which is now figured (pl. XXI, fig. 8), certainly differs from the Indian
JYJayaites, as does Dacque's 'Macrocephalites' rabai (1910, p. 11, pl. II, fig. 2).
Lemoine's 'Macrocephalites' subtrapezinus (non Waagen) and 'Kossmatia ' uhligi
(1910, pl. IV, figs. 5a, b and pl. V, fig. 7a}, may well be true Macrocephalitids
; and the former especially is probably closer to the Madagascar form here
figured as Nothocephalites paradoxus sp. nov. (pl. XXXIX, fig. 8) than to the
somewhat homreomorphus Epimayaites tenuicostatus nom. nov. (=Macrocephalites
palmarum, var. tenuicostata G. Boehm, 1907, p. 92, pl. XXIII, fig. 3) with which
I had formerly compared it.
Again that doubtful Madagascar example recorded by Newton (1889,
p. 334) as 'Stephanoceras macrocephalum ' and previously (1924, p. 10, 1925b,
p. 27) desciibed as possibly a new globose form of Dhosaites, on account of
its ventral sinus cannot be referred to the elephantoides group and as it is
incomplete (see pl. XL, figs. la, b) and does not show a suture-line, it does
not help in the elucidation of the affinities of the East African forms of the
rabai and olcostephanoides group. It may be only a worn Kamptokephalites
of the dimerus type.
The later group of Stephanoceras transiens and St. subtumidum W aagen,.
and the form wrongly identified by Waagen with Sowerby's Amm. maya, with
several new species, are now separated as Epimayaites, gen. nov., type to be
Waagen's large St. transiens, refigured by Noetling. Boehm's 'Macrocephalites ,
metroxyloni ( 1907, pl. XVII, figs. 4a-c), 'M.' batavo-indicus (pi. XVIII), ' M. ' rotangi
(pl. XX}, ' M.' palmarum (pl. XXI, figs. 2a, b only), also Epimayaites sublem