cvi INFERIOR OOLITE AMMONITES. 



are employed : Parvi-, distincti-, subalti-, and alticarinate. These must be qualified 

 thus : subject to old age of individual or race. 



Note. — In above remarks "tabulate" includes "penetabulate." True tabulation 

 of the area, at exact right angles to the keel line, is, of course, hardly found. A 

 slight departure therefrom may be included as " tabulate," a little further 

 departure from rectangularity as " penetabulate," the separation between lateral 

 and peripheral areas being fairly maintained; while " subtabulate " denotes a 

 flatfish area with the separation not so distinct. 



Parvicarinate. 



XL. Genus — Daeellina, 8. Buckman. 



(Type : Darellina planaris, sp. n.) 



Definition. — Platyleptogyral, sublatumbilicate ; subdensiseptate, sublongi-sub- 

 angustilobate ; laterally latanguliradiate ; peripherally anguliradiate (increasingly 

 acute), 1 penetabulate, parvicarinate. (Radial line, Fig. 6(3, p. clxv.) 



Remarks. — The plate-like form and wide, shallow umbilicus are features specially 

 distinctive of this genus. The radial line is biarcuate, becoming increasingly so 

 with age. Species biogenetically earlier than the type might show a V-script line. 



1. Daeellina planaris, 8. Buckm.au. Suppl., Plate XVII, figs. 22 — 24 (Type) 



Plate XXII, figs. 7—9. 



Description. — Sublatumbilicate, costate to levigate. 



Locality and Stratum. — Dorset: Bradford Abbas, Fossil Bed, upper part. 



Date of Existence. — Discitm hemera. 



2. Daeellina doesetensis, S. Buckman. Suppl., Fig. 07. 



Description. — Subangustumbilicate, parvicostate, 

 occasionally connaticostate. 



Distinction. — From D. planaris, a smaller umbilicus 

 and smaller costee. 



Locality and Stratum. — Dorset: Bradford Abbas, 

 Fossil Bed; Stoke Knap, Building Stone, layer 3. 



Fig. 67. — Duri'llinn iJorsetensis, 



Bradford Abbas. /,„,,, nj - Existence.— Discitse hemera, 



1 Increase of rostration during development alters the radial line considerably ; it changes from 

 latangulate at end of costate stage to biarcuate in levigate stage. 



