SUPPLEMENT.— LIOCERAS. 



XXXIX 



Distinction. — The costate stage is shorter, and changes to striate more com- 

 pletely than in bifidatum. 



Localities and Strata. — Dorset : Burton Bradstock, with the preceding 

 species ; Gloucestershire : Stinchcombe, in the sandy ferruginous beds above the 

 Cephalopod-bed ; Leckhampton Hill, similarly (Mr. J. F. Walker, F.G.S.). 



Date of Existence. — Scissi hemera. 



8. Liocekas undulatum, S. Bnchnan. Suppl., Plate IX, figs. 1 — 3, and ? figs. 13, 



14. 



Description. — Platyleptogyral, excentri-gradumbilicate, flexiradiate — costate 

 and striate. 



Distinction. — More umbilicate than the two preceding species. 

 Locality and Stratum. — Burton Bradstock, with the preceding species. 

 Date of Existence. — Scissi hemera. 



9. Lioceras plectile, S. Bnchnan. Suppl., Plate IX, figs. 10 — 12. 



Description. — Platyleptogyral, excentri-gradumbilicate, flexiradiate — sparsi- 

 parvicostate, and striate. 



Distinction. — Less umbilicate than undulatum. More umbilicate and differently 

 ornate to plicatellum. 



Locality and Stratum. — Burton Bradstock, with the foregoing species. 



Date of Existence. — Scissi hemera. 



10. Lioceras partitum, S. Buckman. Plate XIII, fig. 11; Plate XIV, figs. 3, 4; 



Suppl., Plate IX, figs. 4—6. 



1888. Lioceras opalinum, var. comptum, This Monogr., PI. xiii, fig. 11 ; PI. xiv, 



figs. 3, 4. 



Description. — Platyleptogyral, excentri-gradumbilicate, flexistriate, with costa3 

 developed at intervals, but these costas fail in the adult. 



Distinction. — More excentriumbilicate than the other species. From plectile, 

 more compressed. 



Locality and Stratum. — Dorset: Burton Bradstock, with the other species. 



Date of Existence. — Scissi hemera. 



