INFERIOR OOLITE AMMONITES. 



1. Cylicoceeas undatum, S. Buchnan. Suppl., Plate V, figs. 5, 6. 



Description. — Given under genus ; substitute costate for radiate. 

 Locality and Stratum..— Gloucestershire : Haresfield Hill (Bed 15 of Section v, 

 p. 43). 



Date of Existence. — Opaliniformis hemera. 



XII. Genus — Geyeeia, 1 S. Buchnan. 



(Type — Geyeriafasciata, sp. n.) 



Definition. — Platyleptogyral, subangustumbilicate ; densi- FlG g— Radial line \ 

 septate, subbrevi-augustilobate ; laterally flexiradiate ; periphe- °f a fc7ata^ / 



rally anguliradiate, subtabulate, parvi-nonsepti-carinate. I 



Distinction. — From Lioceras or Cypholioceras, greater densiseptation and the 

 subtabulate periphery. From Lioceras or Gylicoceras, a difference of rib flexure — 

 the longer peripheral projection ; and from the latter, too, mode of growth — the 

 greater compression proportionate to umbilication. 



1. Geyeria pasoiata, 8. Buchnan. Suppl., Plate VI, figs. 17 — 19. 



Description. — Platyleptogyral, subangustumbilicate, flexi-connaticostate. 

 Locality and Stratum. — Dorset : Sherborne, in a greyish sandy matrix, not far 

 above the Yeovil sands. 



Date of Existence. — MwrcMsonse, or possibly scissi hemera. 



The following species has some resemblance, but it seems scarcely to be a 

 Geyeria. The radial curve is more biarcuate, also there are characters of pauci- 

 septation, brevilobation, and less compression. 



•2. Geyeria? evertens, S. Buchman. Suppl., Plate XI, figs. 10 — 12. 



Description. — Platy-subleptogyral, sublatumbilicate ; subparvicos- 

 tate ; periphery subfastigate, changing to subconvex, parvi-subacuti- fig. 9.— Rndiai 



nrinntp line of ©qwfa * 



Odl incite. evertens. 



1 In honour of Dr. G. Geyer. 



