SUPPLEMENT.— PLATYGEAPHOCEEAS. xciii 



4. Pseudogeaphoceeas? compeessum, 8. Buclcman. Plate XV, figs. 5, 6; Suppl., 



Plate XV, fig. 21. 



1888. Lioceras concavum, var., This Monogr., PL xv, figs. 5, 6. 

 1902. Pseudographoceras compressum, Emend. Anim. Noui., p. 5. 



Description. — Subconcavumbilicate, parvicostate. 



Remarks. — This species lias some resemblance to the one figured by Vaeek, 

 dealt with in the last article, so far as the general shape and the direction of the 

 costas are concerned. But the style of ribbing is different — it is of a more distant 

 pattern. So it is doubtful if this species is the involute mutation of Vacek's, or 

 if it belongs strictly to the same series. 



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



Date of Existence. — Concavi, or Discitse hemera. 



5. Pseudogeaphoceeas ? caeinieeeum, 8. Buclcman. Suppl., Plate XX, figs. 



1:3—15. 



Description. — Gradumbilicate, parvi- and spissicostate. 



Remarks. — The umbilicus shows connaticostas. This species has ornament of 

 a similar character to that of Pseudographoceras, and to Vacek's species ; but it is 

 more compressed than any of the foregoing, and is distinguished by an elevated 

 carina. 



It is generically distinct from P. literatum ; but as there is no other species 

 close akm to be associated, it may retain this generic title for present convenience. 



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



Date of Existence. — Discitse hemera. 



XXXIV. Genus — Plattgeaphoceeas, S. Buclcman. 



(Type : Platygraphocera8 apertum, S. Buckman.) 

 1902. Plattgraphoceras, Emeixl. Amm. Nom., p. 4. 



Definition. — Platyleptogyral, subangustumbilicate ; subdensi- 

 septate, sublongiangustilobate ; laterally anguliradiate ; peripherally 

 subrecti-radiate, subplanifastigate, subobsoleticarinate. 



Distinction. — From Pseudographoceras, difference in proportions, 

 difference in character of costation, subobsolete carina at all stages. 



Remarks. — Definition and distinction apply only to the typical ^/ofPfoty- 81 

 or paucicostate series. g Zpt°rh'm. S 



