. The Quarterly journal of the Geological Society of London. laschke, stand nearer to theEnglish species than does P. ulmensis Oppel sp. P. denseplicatushas a wider umbilicus, and is considerably thinner and narrower inthe whorl; also important differences in the lobe-line appear tobe present, at least so far as the material that has been figured-is concerned. P. postulmensis appears likewise to have a wider umbilicus, and;to show narrower and thinner whorls. Virgatites quenstedti Rouillier is a form which has similar rib-bing; but its whorl-section and proportions are quite different. EXPLANA
. The Quarterly journal of the Geological Society of London. laschke, stand nearer to theEnglish species than does P. ulmensis Oppel sp. P. denseplicatushas a wider umbilicus, and is considerably thinner and narrower inthe whorl; also important differences in the lobe-line appear tobe present, at least so far as the material that has been figured-is concerned. P. postulmensis appears likewise to have a wider umbilicus, and;to show narrower and thinner whorls. Virgatites quenstedti Rouillier is a form which has similar rib-bing; but its whorl-section and proportions are quite different. EXPLANATION OF PLATES XLI & XLII. Plate XLI. Portlandian, eastlecottensis zone. Perisphinctes eastlecottensis, sp. nov. Holotype. Lydite Pebble-Bed, Eastle-cott, Swindon (Wiltshire). Coll. British Museum (Nat. Hist.), No. view, X07. Plate , eastlecottensis zone. Perisphinctes eastlecottensis, sp. nov. Fig. 1, peripheral view; Fig. 2,apertural view of the example shown in PL XLI, both X 07. Quart. Journ. Geol. Soc. Vol. LXIX, J. W Tutcher. Photo. PERISPHINCTES EASTLECOTTENSIS, sp. n< * 0-7 Quart. Journ. Geol. Soc. Vol. LXIX,
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
