cxvi INFERIOR OOLITE AMMONITES. 



Localities and Strata. — Dorset: Stoke Knap in the Building Stone; Bradford 

 Abbas, Fossil Bed, presumably upper part ; one specimen 126 mm. in diameter, 



/<7 



Fig. 77. — Dissoroceras subornatum. Stoke Knap. 



showing decline of carina and lengthening of peripheral bend of radial line- 

 collected by Mr. D. Stephens ; another specimen in Mr. Monk's collection. 

 Date of Existence. — Discitse hemera, presumably. 



3. Dissoeoceeas excavatum, 8. Buckman. Suppl., Fig. 78 in text. 

 1889. Htperlioceras discites, e (pars), This Monogr., p. 95. 



Kiii. 7s.- Disstironjirts ccrcwntuin. linv.Uord Abbas. 



Description. — Subconcavumbilicate ; obscuricostate to levigate. 

 Distinction. — The smaller, less costate, subconcavumbilicus ; the more com 

 pressed whorls, the narrower periphery. 



