CRICK: ON AMMONITES ROBUSTUS, BLFD. 295 
deep, with steep sides and a subangular margin. Whorl semi-elliptical 
in transverse section, its width one and a half times its height; 
indented to about one-third of its height by the preceding whorl ; 
periphery broadly convex, with a narrow median depression, im- 
perfectly defined; sides flattened, feebly convex; inner area well 
defined, rather broad, nearly perpendicular to the plane of symmetry 
of the shell. Body-chamber (? length) ; aperture not seen. Chambers 
shallow ; septal suture imperfectly known. Test with narrow, 
prominent, rounded ribs, which bifurcate at various places on the 
lateral area ; they are all interrupted at the centre of the peripheral 
area, the mbs being usually opposite, but sometimes alternating; 
occasionally there is a groove, somewhat wider than the spaces 
between the ribs, running from the periphery to the umbilical margin. 
The only example of this species in the British Museum collection 
is one of the specimens figured by Blanford (l.c., pl. xvi, fig. 16) as 
Ammonites robustus. It is probably the example 4, the dimensions of 
which are given on p. 85. It is incomplete, being entirely septate ; 
and unfortunately the suture-line cannot be well made out. At the 
peripheral depression the ribs are usually opposite, but at the anterior 
portion of the specimen they become alternating. The periphery is 
not quite so much depressed as represented in Blanford’s figure. Its 
dimensions are :— 
mm. 
Diameter of shell (entirely septate) as 56°5 
Width of umbilicus S a ae 8 
Height of outer whorl... oa or 27°5 
Thickness of outer whorl... sie Bee 40 
Type.—B.M. Coll., No. C. 5,046. 
Horizon and Locality—The single example representing this species 
is from Niti, and, judging from the matrix, probably from the same 
horizon as the example which we have referred to Juvavites ( Gries- 
bachites) Stracheyt, i.e. from the Daonella-beds of the Upper Trias. 
From the Himalayas Dr. E. von Mojsisovics has described three 
species referable to the subgenus Anatomites, viz., Juvavites 
(Anatomites) Bambanagensis,' J. (A.) Eugenii,? and J. (A.) Caroli,? all 
from the ‘ Karnische Stufe,’ and from the Daonella-beds. The present 
species comes nearest to the first-mentioned, but that is smaller and 
more inflated ; still, we believe, both species come very near Anatomites 
rotundus* from the ‘ Karnische Stufe’ of Aussee, Austria. From the 
two other specimens also referred by Blanford to Ammonites robustus 
the present species is at once distinguished by the absence of marginal 
tubercles, its more inflated form, and more finely ornamented shell. 
1 Dr. E. v. Mojsisovics, ‘‘ Beitrage zur Kenntniss der obertriadischen Cephalopoden- 
Fauna des Himalaya’’: Denkschr. k. Akad. Wissensch. Wien, math.-naturw. 
CL., Bd. Ixiii (1896), p. 603, pl. xi, fig. 1. 
2 Dr. E. v. Mojsisovics: op. cit., p. 604, pl. xi, fig. 3. 
3 Dr. KE. v. Mojsisovics: op. cit., p. 605, pl. xi, fig. 2. 
* Dr. E. v. Mojsisovics: Ceph. der Hallstatter Kalke, Bd. ii, p. 98, pl. xc, figs. 6-9 ; 
pl. exxvi, fig. 11; pl. cxev, fig. 11. 
