cliv INFERIOR OOLITE AMMONITES. 



21. PsEUDoaEAMMOOEEAS ? sp. Plate XXIX, figs. 6, 7; Suppl., Fig. 153, p. clxvii. 



Grammoceras doerntense, This Monogr., PI. xxix, figs. 6, 7; pp. 182 — 184 

 (pars). 



Remarks. — More compressed and less costate than P. doerntense, and it has 

 a less projected radial line. Its generic position is quite uncertain. 



Dates of Existence of Pseudogrammocerata. 



Since the species were first described attempts have been made towards more 

 exact chronology; for instance, the term " Dispa nsum beds" was found to be too 

 wide. The following table summarises the dates, by hemerae, so far as present 

 information allows. 



Dispansi. — (Genus, Phlyseogrammoceras, see below). 



Steuckmanni. — Pseudogrammoceras quadratum ? aff. quadratum, subquadratum, 

 Bingmanni, regale, Struchmanni, Muelleri, doerntense, placid 'urn . 



Striatum. — Late: 1 P. thrasu ? pedicum, subfallaciosum, expedltuni, Gotteswoldlse, 

 Ssemanni? pachu? fallaciosum? Early: P. explicatum. 



Variabilis. 



Lilli. — P. obesum; (HUdoeeras semipolitum). 



Bifbontis. —{HUdoeeras bifrons). 



b. Tuberculate. 

 LX. Genus — Phltseogeammoceeas, 2 8. Buck num. 



(Type : Phlyseogrammoceras mettalarium, 5 Dumortier, sp.) 



1901. Phylseogrammoceras, Proc. Cotteswold Club, vol. xiii, p. 266 (misprint). 



1902. Phlyseogrammoceras, Emend. Amm. Nom., p. 4. 



Definition. — Platyleptogyral, subangustumbilicate ; 4 laterally parvibullate, flexi- 

 radiate ; peripherally acutanguliradiate, septicarinate. (Radial line, fig. 154, p. clxvii.) 



1 Date of Ammonites of the Haugia Eseri-type ; and see Ammonite sequence given in "Dundry 

 Hill," ' Quart. Journ. Geol. Soc.,' vol. Hi, p. 688, footnote 2. 

 - 'l>,\i'<Tir, a breaking out. 



3 The species figured in PI. XXXVI, figs. 1, 2, is the type of the genus. 

 * Becoming latumbilicate by excentric coiling in catagenetic species. 



