184 INFERIOR OOLITE AMMONITES. 



Plate XXIX, fig. 1, represents the side view of a typical specimen from Coaley 

 Wood. The irregularity of its ribs, especially in the inner whorl, is scarcely 

 brought out enough. Fig. 2 gives the front view. Fig. 3 illustrates the suture- 

 line of the same specimen, showing that the lobes are longer and more ornamented 

 than in Gramm. toarcense. Figs. 4, 5 show two views of a smaller specimen from 

 the same locality. In figs. 6, 7 are depicted two views of a still smaller form from 

 the so-called " Upper Lias" of South Petherton, probably the horizon of Bed 2, 

 Section XIII, p. 165. In figs. 8, 9, 10 are shown three views of a grand specimen 

 from Coaley Wood; in fig. 8 the fine growth-lines of the body-chamber are noticeable 

 and also the portion of lateral mouth-border is visible ; fig. 9 shows the front view ; 

 and fig. 10 the back view, with the ventral strise well marked over the carina. In 

 Plate XXXIII, figs. 11, 12, a smaller specimen of this same form is depicted, in order 

 to show that the adult specimen last mentioned is not the adult of specimens of 

 the typical doerntense (Plate XXIX, figs. 1 — 7), but is the adult of this. The 

 specimen came from the Dispansum-heda, Coaley Wood, and is in my Collection. 

 It is very nicely and sharply preserved, though parts of the outer layer of test are 

 absent ; the carina is entire. 



Geammocbras Orbignyi, S. Buckman. Plate XXVII, figs. 3 — 6. 



1842. Ammonites bauians, d'Orligny. Ceph. Jurass. ; Pal. franq., pi. lix. 

 1852. — — Chapuis et Dewalque. Foss. Terr, secondaires Luxem- 



bourg ; Mem. cour. et Mem. des sav. etrang., 

 torn. XXV, pi. X, fig. 3 ; pi. xi, fig. 1 (?). 

 1885. — cf. COMPTUS, Quenstedt. Amm. Schwabischen Jura, pi. liv, fig. 



47(?). 

 1885. — Aalensis, Quenstedt. Amm. Schwiibiscben Jura, pi. liv, 



fig. 6 (?). 



Discoidal, compressed, carinate. Whorls convex from inner edge to the carina, 

 ornamented with subarcuate, passing to subsigmoidal, radii which are nearly the 

 same size all across the whorl, but sometimes slightly fascicled on the inner area. 

 Ventral area undefined, acute, and carrying a small solid carina. No inner margin. 

 Inclusion about one-third. Umbilicus shallow and open, somewhat more depressed 

 in the centre. 



The extreme scarcity of this species prevents a full discussion of its peculiarities 

 To my mind it seems to agree with d'Orbigny's figure of Am. radians in every way 

 but one ; and that one is a slight fasciation of the ribbing upon the inner area. I 



