cxxviii INFERIOR OOLITE AMMONITES. 



Distinction — From Darellia, the radial line, which is falcate instead of biarcuate, 

 the stronger carina, the smaller umbilication. From Toxolioceras, the radial line, 

 the smaller umbilicus, the slightly convergent, not parallel-sided, build of whorls. 



1. Stokeia maemoeea, 8. Buchman. Suppl., Plate XXII, figs. 13 — 15 ; Fig. 99, p. clxv. 



Description. — Subdistanti-subobscuricostate to levigate ; gradmnbilicate. 



Remarks. — The ribs are connate, inconspicuous, and rather distant. There is 

 a gradual decline to stria? at about 50 mm. diameter ; but the ribs are very feeble 

 before that. 



Locality ami Stratum. — Dorset: Stoke Knap, Building Stone. 



Date of Existence. — Discitse hemera, presumably. 



2. Stokeia subacuta, $. Buchman. Suppl., PI. XVIII, figs. 10 — 12. 



Description. — Obsoleticostate to levigate; concavumbilicate. 



Remarks. — -The overlap of whorl is to the edge of preceding inner margin. 

 There are faint indications of distant costge ; but practically the costge have failed 

 when the diameter of about 25 mm. is reached. 



Distinction. — From S. marmorea, failure of costa?, the concavumbilicus, the 

 narrower periphery. 



Localities ami Strata. — Dorset: Bradford Abbas neighbourhood, probably 

 Halfway House from the " Blue Beds " ; but the exact locality is not recorded. 

 Somerset : Dundry, Limestone and Marl beds. 



Date of Existence. — Discitse hemera, presumably. 



End of Carinatitabulate series. 



A Lioceratoid genus. 1 

 LIII. Genus. — Canavaeella, S. Buchman. 



(Type: CanavareUa helophora, sp. n.) 



Definition. — Platysubleptogyral, sublatumbilicate ; subdensiseptate ; subbrevi- 

 subangustilobate ; laterally flexiradiate ; peripherally acutanguliradiate, acutifasti- 

 gate, parvicarmate. (Radial line, fig. 100. p. clxv.) 



Distinction. — From Lioceras, the whorls thinner and more acute peripherally ; 

 the radial line more projected peripherally and altogether more definitely falciform. 



1 See p. xxxiii. 



