SUPPLEMENT.— LIOCERAS. xli 



Locality and Stratum. — Dorset : Burton Bradstock, in the same bed as the 

 other species. 



Date of Existence. — Scissi hemera. 



13. Lioceras ghave, 8. Bvchnan. Suppl., Plate VIII, figs. 4 — 6. 



Description. — Platyleptogyral, concavumbilicate, flexistriate. 

 Distinction. — From all other species by the concavumbilicus. 

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

 Date of Existence. — Scissi hemera. 



14. Lioceuas opalinum (Beinecke). Suppl., Plate X, figs. 6 — 8. 



1818. Nautilus opalinus, Beinecke, Maris Protog., figs. 1, 2. 

 1849. Ammonites opalinus, Quenstedt, Die Ceph., pi. vii, fig. 10. 1 



Description. — Platyleptogyral, subconcavumbilicate, flexistriate. 



Note. — There is a slight fasciation of the radii, giving the test a somewhat 

 wavy appearance. 



Distinction. — In umbilication it is most like grave, but it is much, more 

 compressed than that species. In the matter of ornament there is considerable 

 similarity to Thompsoni, but the umbilicus is distinctly smaller, showing prac- 

 tically no gradumbilicate character until excentricity begins. It therefore does 

 not show the small costaa in the umbilical whorls which are noticeable in 

 Thompsoni. 



Remarks. — Quenstedt's figure is taken as the type for the reasons which have 

 been already stated (p. xxxiv). It is considered as supplementing Reinecke's in 

 the detail of the radial line. 



Correction. — The appellation of the specimens called Lioceras opalinum in the 

 body of the work must now be altered. (See syn. of other species of this genus, 

 of Cypliolioceras opaliniforme, &c.) 



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



Date of Existence. — Scissi hemera. 



1 Of the other figures of platyleptogyral, angustumbilicate, striate Ammonites quoted by the 

 specific name opalinus in the synonymy given in this Monograph, p. 35, many are evidently distinct 

 from this genus as now defined on account of the radial line, so far as its course can be judged from 

 the figures, and none probably belong to this species. 



F 



