S [JPPL K M K N'T.- GRAP H0( J E RAS. 



B. Sl'lSSrcONTAT.F. 



5. Platygraphoceras ? oompactum, 8. Bud-man. Plate XV, figs. 1, 4; Plate A, 



fig. 1 7 ; Suppl., Fig. 57 in text. 

 1889. Lioceras apertum, This Monogr., PI. xv, figs. 3, 4. 



Description. — Gradumbilicate, spissiparvicostate. 

 Localities and Strata. — Dorset : Bradford Abbas, Fossil 

 Bed, upper part (common). 



Date of Existence. — Discitie hemera. 



Fig. 57. — Radial lines of 



Platygraphoceras ? 



compaelnm. 



XXXV. Genus — Geaphoceras, 1 S. Buckman. 



(Type: Graphoceras vscriptum, S. Buckman.) 



1888. Lioceras (pars), This Monogr , p. 21. 



1898. Graphoceras, S. Buckman. 'Jurassic Time;' Quart. Journ. G-eol. Soc. 



vol. liv, p. 458. 



Definition. — Platysubleptogyral, angustumbilicate ; subdensiseptate, sublongi- 

 latilobate ; laterally anguliradiate ; peripherally subrectiradiate, fastigate, parci- 

 carinate. 2 



Remarks. — The broad V-shaped course of the radial line is a 

 very noticeable feature. There is hardly any peripheral projec- 

 tion of the radial line. 



Distinction. — Comparable only with Pseudograplioceras and 

 Platygraphoceras so far as the radial line is concerned. Separable 

 from the former by the style of ornament, the paucicostation, 

 wherein it agrees with the latter, but is distinct therefrom on 

 account of less compression and less nmbilication. 



The species now ranged in this genus are capable of division 

 into distinct groups. 



Fig. 58.— Radialline 



of Graphoceras 

 v-scriptum. 



I. Parcicarinate. 

 (i. Subpaucicostate. 

 1. GrRAPHOCERAS BOBUSTdM, 8. Buckman. Suppl., Plate XV, figs. ( .> — 11. 



Description . — Subconcavumbilicate, pauci-subcrassicostate. 

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

 Date of Existence. — Concavi hemera. 



1 Vpafoi, a written character, a letter. 



2 Scarcely carinate; the term " obsoleticarinate " might convey an idea of degeneration which 

 may or may not be the case. 



