196 INFERIOR OOLITE AMMONITES. 



fig. 8, appears shallower and more stretched than fig. 7 ; the inferior lateral lobe 

 is broader, and the inner part of the suture-line not so elevated. These differ- 

 ences are what might be expected to accompany greater involution. 



This species is scarce. It occurs in the Opalmum-zone (Moorei-beds) at 

 Haresfield Hill, Frocester Hill (Coaley Peak), Coaley Wood, and North Nibley, 

 Gloucestershire. 



Plate XXXIII, fig. 5, represents a specimen from Coaley Peak with its inner 

 test preserved ; fig. 6 is the front view ; and fig. 7 is the suture-line. Fig. 8 

 represents the side view of a specimen from Coaley Wood — a specimen not 

 quite so smooth, and with a rather different suture-line (fig. 10). Fig. 9 is the 

 front view. 



Grammoceras distans, 8. Buckman. PI. XXXIII, figs. 1, 2. 



1879. Haepoceeas subundttlatum, var. eiteene-punctatum, Branco. Unt. 



Dogger ; Abh, geol. Spez.-Karte Elsasa- 

 Lothringen, Bd. ii, Heft 1, pi. iv, figa. 1 

 a—g, only. 



Discoidal, compressed, carinate. Whorls ornamented with somewhat distant 

 subarcuate, generally single ribs. Ventral area undefined, ornamented with a 

 small solid carina. Inclusion about one-fourth. Umbilicus very open and 

 shallow. 



At first I v^as inclined to identify this form with Reinecke's " Nautilus " costula ; 

 but now I believe that this would be a mistake, and that the species is unnamed. 

 I give it the name of " distans " on account of the large spaces which separate the 

 costse. 



As the best interpretation of Reinecke's dubious form, '* Nautilus " costula, I 

 take Quenstedt's delineation (" Ceph.," PI. vii, fig. 11). This represents a species 

 belonging to the genus Dumortieria, from which the present species differs in 

 having subarcuate radii projected considerably on the ventral area, and, presum- 

 ably, therefore, in having a different suture-line. Its ribs are also closer together, 

 and it is somewhat more compressed. 



I know of nothing to which I can trace the origin of this rare little species, 

 except it be to Gra,mm. toarcense, of which we may imagine it a dwarf descendant, 

 differing mainly in being so much more compressed. From Gramm. striatulum it 

 is distinguished by its coarser ribs and more evolute whorls ; while from Gramm. 

 aalense it may be known by its more distant, generally single ribs, and its more 

 evolute whorls. 



