cxxvi INFERIOR OOLITE AMMONITES. 



Biarcurate, much projected peripherally. 

 LI. Genus— Toxolioceras, 1 8. Buckman. 



(Type : Toxolioceras WalJceri, S. Buckman.) 

 1902. Toxolioceras, Emend. Amm. Nom., p. 5. 



Definition. — Platyleptogyral, angustumbilicate ; clensiseptate, brevisublati- 

 lobate"; laterally anguliradiate, peripherally acutanguliradiate, tabulate, crassi- 

 alticarinate. (Radial line, Fig. 97, p. clxv.) 



Distinct in n. — From Darellia, radial line more projected peripherally, stronger 

 carina, character of costate ornament. From Hyperlioceras, radial line more 

 definitely biarcuate, larger umbilication, earlier smoothness. 



Remarks. — The alti-carinati-tabulate periphery is shown to perfection in adult 

 T. Wall-en. 



1. Toxolioceras incisum, 8. Buchnan. SuppL, Plate XXI, figs. 31—38. 



Description. — Subangustumbilicate, costate. 



Localities oral Strata. — Dorset: Bradford Abbas, Fossil Bed; Burton Brad- 

 stock, grey matrix. 



Date of Existence — Discitse, hemera, presumably. 



2. Toxolioceras munditm, (8. Buchnan). SuppL, Plate XVIII, figs. 4 — G. 



Description. — Parvispissicostate and subangustumbilicate (gradumbilicate). 

 Distinction. — From T. incisum, smaller umbilicus, neater ornament. 

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

 Date of Existence. — Discitse hemera. 



3. Toxolioceras Walkeri (*S r . Buchnan). Plate XVI, figs. 1,2; Suppl., Plate 



1889. Hyperlioceras Walkeri, This Monogr., PL xvi, figs. 1, 2, only (not figs. 



4— 11). :! 

 1902. Toxolioceras Walkeri, Emend. Amm. Nom., p. 5. 



Distinction. — From T. mundum, smaller umbilicus before excentricity com- 

 mences. In the adult the umbilicus reverts from angust to become subangust. 



1 Tofov, a bow, in reference to the radial line. 



2 In adult T. Walkeri, affected perhaps by gerontic catagenesis. 



'• Pigs. 3 — 6, Darellia polita ; figs. 7, 8, 9, Reynesellapiod.es; figs. 10, 11, Beynesia coela. 



