SUPPLEMENT.— PSEUDOGRAPHOCERAS. xci 



a grey matrix, but I do not know the horizon. This specimen is 20 mm. in 

 diameter, and shows a lateral auricle, like so many of the other species. 

 Date of Existence. — Uncertain ; Murchisonse to discitae hemera. 



23. Ludwigella modica, S. BiicJcman. Suppl., Plate XIX, figs. 37 — 39. 



Description. — Platyleptogyral, sublatumbilicate ; subspissi- and parvicostate, 

 often connaticostate. 



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

 Date of Existence. — Discitm hemera. 



V-SCEIPTIRAD1ATE. 



In the following genera the radial line has, on the lateral area, a noticeable V- 

 form, made the more conspicuous by a want of projection on the periphery. Such 

 a radial line is a kind of exaggeration of the tortiradiate feature ; and just as that 

 gradually changes, so this one develops to a biarcuate style. Generally, however, 

 the V-script form is very persistent. 



XXXIII. Genus — Pseudogeaphoceeas, S. Buckman. 



(Type: Pseudographoceras literatum, sp. n.) 

 1899. Pseudographoceras. This Monogr., Explan. Suppl. 



PI. xi. 



Definition .■ — Subplatysul )leptogyral, sublatumbilicate ; (subden- 

 siseptate, subbrevi-sublatilobate) ; * laterally anguliradiate ; peri- 

 pherally rectiradiate, tabulate, parvi-nonsepti-carinate. 



Fig. 53.— Riulial 



line of Pseudo- 



ffraphoceras 



literatum. 



1. Pseudographocekas i.iTEKATUM, S. Buchiian. Suppl., Plate XI, figs. 19 — 21. 

 Description . — Sublatumbilicate, costate. 



Remarks. — The ribs are mostly bifurcate just inside the lateral angle. In size 

 they are very regular, and though numerous they are rather prominent. 



Localities and Strata. — Dorset: Bradford Abbas, from the Paving Bed; 

 Chideock Quarry Hill, from the " Wild Bed." 



Date of Existence. — Murchisonse. hemera. 



2. PsEUDOURAPHOCEEAS deletum, S. Bitchnaii. Suppl., Plate XI, figs. 22 — 24. 



Description. — Subangustumbilicate, striate, parvi- becoming obsoleti-carinate. 

 Remarks. — The costate stage in a reduced form is seen at the beginning of the 



1 From a specimen of Ps. deletum. 



