SUPPLEMENT.— FONTANNESIA. clxxxvii 



Description. — Subplatysubleptogyral, latumbilicate ; spissiparvicostate ; peri- 

 phery fastigate, parvicarinate. 



Distinction. — From Dum. munda, the costation, the larger umbilicus. 



Localities and Strata,. — Gloucestershire : Frocester Hill, Cephalopod Bed ; 

 Dorset: Chideock Hill, Bridport Sands with ih linearis. 



41. Dumoetiekia exacta, S. Buckman. Plate XLV, figs. 6, 7. 



1892. DUMORTIERIA SUBUNDULATA, This MoilOgl - ., PI. xlv, figS. 6, 7. 



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



Description. — Subplatyleptogyral ; latumbilicate; subspissi-subparvicostate ; 

 periphery subacutifastigate, subcarinate. 



Distinction. — From D. Brancoi, more definite costation, thinner whorls, more 

 acute periphery. 



Localities and Strain. — Gloucestershire : Buckholt Wood, Cam Down, Penn 

 Wood, Cephalopod Bed, upper part (" Moorei Beds "). 



IV. Genus — Fontannesia 1 , 8. Buckman. 



(Type: Dumortieria grammoceroid.es, Hang.). 



1891. Dumortieria, pars, This Monogr., p. 231. 

 1902. Fontannesia, Emend. Amm. Nom., p. 6. 



Definition. — Subplatysubleptogyral ; latumbilicate ; subdensiseptate ; sublongi- 

 angusti-ornati-lobate ; laterally subflexiradiate ; peripherally latanguliradiate ; 

 convex, parcicarinate. (Radial line, fig. 186, p. exevi.) 



Notes. — Such are the characters of the typical series, modifiable according to 

 the degree of development. But there are other series which do not quite conform, 

 even allowing for developmental variation. Thus a periphery convex and carinate 

 is found, and a costation varying from subflexirursiradiate to subrectiversiradiate 

 is shown. 



Distinction. — From Dumortieria, the more ornate suture-line, and the longer 

 peripheral projection of the radial line. The costae lack that annular appearance 

 so noticeable in Dumortieria. 



Remarks. — The species of this genus are interesting for the likeness in certain 

 cases to species of Sonninia, 2 from which, however, they are separable by the 

 suture-line with dependent inner portion. This suture-line is of the type of that 



1 In honour of F. Fontannes, collaborator with E. Dumortier. 



2 See p. 339, and footnote *, p. 340. 



