94 
Records of the Geological Surrey of India. 
[VOL. IV. 
The genus Perisphinctes has furnished, of all the Ammonites, the greatest number of 
species, and I regret that the European species of this genus are as yet so little known, that 
in many cases a comparison of our fauna with the forms found in European strata 
becomes utterly impossible. The forms of Perisphinctes found in Kuteh may be 
conveniently divided into a few larger sections, which I may call after the oldest and best 
known species, without, however, assigning these sections the value of developmental series 
(Eormenreihen, Entwickelungsreihcn). I distinguish (1). A section of forms, 
related to Per. Kunigi, Sow.; the species to which I refer represent a connecting link 
between the last mentioned species and Per. Poland),, Frisch Uni, and other Ammonites 
of the European Upper Jura. The whole section ranges between the true Perisphinctes 
and Stephanoceras, and, following the external form, it could almost with equal right be 
referred to the one or the other of the two genera. (2). Section of forms allied to Per. 
Martimi, Orb. The species of this section chiefly occur in middle Jurassic and Callo- 
vian beds, and their number was recently considerably increased by the description of new 
forms in Europe. The latest representatives of it in Europe are known from Oxford strata. 
(3). The species of this section are allied to Per. plicatilis, Sow., and are chiefly from 
Oxfordian and Kimmcridgian beds. (4). Section of forms allied to Per. Peh- 
manni, Opp. A small series of species with a very peculiar shape, in many points entirely 
separated from all the other Perisphinctes, and chiefly characteristic for the Callovian- 
Besides these there occur in the Kutch-Jura also some other species which cannot he referred 
to any of those sections, and which must for the present be looked upon as sporadic, or 
isolated species. 
The first section, characterised by the great scarcity of contractions on the whorls, 
mostly without any umbilical edge, and by thick scarce ribs, includes the following species 
from Kuteh: 
Perisphinctes obtusicosta, Waagen, n. sp. (oolite of Dhosa; iron nodules of Keera 
hill; gray marl nodules, N. of Goodjinseer). 
„ angygaster, Waagen, n. sp. (same rocks and localities as preceding 
species). 
„ Dhosaensis, Waagen, n. sp. (oolite of Dhosa; brown oolite of the 
Jooria hills; iron nodule, Keera hill). 
„ mutans, Waagen, n. sp. (dark red iron rock, N. of Goodjinseer). 
Perisphinctes obtusicosta, Waagen, n. sp. Slightly resembling Per. Polandi, Opp., 
but with less numerous and rounder ribs, which are not divided so far down as in the last 
mentioned species; in large specimens the ribs become flatter and more numerous. The 
lobes are much finer and more ramified than in Per. Polandi. 
Perisphinctes angygaster, Waagen, n. sp. In its general form resembling Per. 
involutus, Quenst., but with only dichotomc ribs, which are few in number and obtusely 
rounded; in some places there is a broad, flat, contraction of the whorl visible. The lobes 
are very much like those of the preceding species. 
Perisphinctes Dhosaensis, Waagen, n. sp. A small species of about 40 m m. in diameter, 
with wide umbilicus, rounded whorls and very strong dichotomc ribs, which often become 
a little broader in passing over the siphonal side, resembling the ribs in some Aegoceras or 
in Amm. fissicostatus, to which latter species pur specimens have a certain resemblance as 
regards their general form. The lateral margins of the aperture have two not very long 
lancet-shaped ears. The species seems to he common. 
Perisphinctes mutans, Waagen, n. sp. Young specimens of this species have a certain 
resemblance to Pei. Dkosaensis, but the form changes even at an early stage: the whorls 
