SUPPLEMENT.— COSMOGYRIA. liii 



Distinction. — From Welschia, the suture-line has longer and narrower lobes, 

 the periphery is more tabulate, and the ornament is coarser. 



1. Cosmogyria obtusa (Quenstedt) . Suppl., Plate IV, figs. 10 — 12 d. 



1849. Ammonites MoncnisoNiE obtusus, Quenstedt, Ceph., pi. vii, fig. 12. 



Description. — Platy - subpachygyral, angustumbilicate, subcrassi - subpauci- 

 costate. 



Remarks. — The distinctive features of Quenstedt's figure are — stout whorls 

 and a small umbilicus, costas almost straight across the lateral area, fairly large 

 and somewhat distant, a very distinctly flattened periphery wherein the carina 

 seems a trifle sunk, a rather long and narrow superior lateral lobe. It seems that 

 the specimen now figured agrees with Quenstedt's delineation in all these details. 



Although so like obtusiformis in its general appearance and proportions, yet 

 as the degree of ornamentation and the shape of the periphery are different, it 

 cannot be the same species ; and as the suture-line is certainly different, while the 

 radial line is somewhat so, it cannot be placed in the same genus. 



Locality and Stratum. — Somerset : Dundry Hill, the west end, from a rather 

 hard, greyish-brown iron shot limestone. 



Date of Existence. — Murchisonx hemera, probably. 



2. Cosmogyria subtabulata, S. Buchnan. Suppl., Plate IV, figs. 13 — 15 b. 



Description. — Platy- subpachygyral, gradumbilicate, subcrassicostate, peri- 

 phery subtabulate. 



Distinct ion. — From obtusa, a more concentric umbilicus, more numerous and 

 more elevated costas, a broad and more tabulate periphery. 



Locality and Stratum. — Dorset : Chideock Quarry Hill, from what the work- 

 men call the " Building Stone " or the " Red Beds." 



Date of Existence. — Bradfordensis hemera. 



