Ixiv INFERIOR OOLITE AMMONITES. 



Distinction. — From cosmia, a smaller umbilicus, greater compression, less 

 ornament. 



Locality and Stratum. — Dorset : Broad Windsor, probably from the lower beds 

 of the road-cutting at the entrance to the village (collected by Mr. Darell 

 Stephens, F.G.S.) ; Bradford Abbas, from the Paving Bed; Mapperton, near 

 Beaminster, from a grey matrix. 



Date of Existence. — Murchisonse-hemeva. 



Angulieadiate. 



In the genera now to be described the lateral angularity of the radial line 

 forms a particular distinction from those preceding, especially when, as is often 

 the case, it is associated with a very small peripheral projection. 



The species allotted to the genera xxi — xxiii may be divided into two series 

 by the suture-lines : — a. Parvilobate, xxi, xxii ; b. Magnilobate, xxiii. 



In the division a, however, there are three series. One is not accorded generic 

 rank now, but some Gloucestershire material obtained while these pages are 

 passing through the press seems to indicate that it will merit such distinction in 

 the future. So in the parvilobate division there may be separated — 1, angusti- 

 lobate, Kiliania ; 2, latilobate, Paquieria. But then 1 is capable of further 

 division : — a. Periphery tabulate (example, Kiliania laciniosa) ; /3. Periphery 

 subtabulate (example, Kiliania? tuberata). 



In degeneration (phylogerontic stage) both the series a and /3 should acquire 

 fastigate peripheries, but that of [5 should be the more acute. 



a. Paevilobate. 



1. Angustilobate. 



XXI. Genus — Kiliania, 1 S. Backman. 



(Type — Kiliania laciniosa, sp. u.) 



Definition. — Platy-subpachygyral, angustumbilicate, subpauci- 

 septate, sublongi - subangustilobate ; laterally subanguliradiate ; 

 fig. 22Xitiuiiai peripherally obtusanguliradiate, tabulate, parvi-nonsepticarinate. 

 KiUanialaciniosa Distinction. — The proportions are similar to those of Welschia; 

 1 Iu honour of M. W. Kilian, professeur a la Universitc de Grenoble. 



