A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . Phillips, Morris & Lycett, S. Stutch-bury, it. Damon, W. H. Hudleston, J. P. Blake, and others. The Portland Oolite, from which is derived the name ofthe Portlandian Age, is worked for building stone in DorsetBetween and Wiltshire. Two slabs of the hard Portland stone are Wall-eases shown; one of them contains shells of the lamellibranchs,5 & 6. Pcriia Bouchardi and Clilamys [Pecten] lamellosus; the otheris almost entirely composed of shells of Ceritliium concavum
A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . Phillips, Morris & Lycett, S. Stutch-bury, it. Damon, W. H. Hudleston, J. P. Blake, and others. The Portland Oolite, from which is derived the name ofthe Portlandian Age, is worked for building stone in DorsetBetween and Wiltshire. Two slabs of the hard Portland stone are Wall-eases shown; one of them contains shells of the lamellibranchs,5 & 6. Pcriia Bouchardi and Clilamys [Pecten] lamellosus; the otheris almost entirely composed of shells of Ceritliium the middle of the gallery is a large block of the Eoach-bed, which is full of hollows, whence the shells have beendissolved by percolating water, leaving behind impressionsand internal casts of the following species : Trigonia gihhosa,Chlamys lawtellostis, Ostrea expansa, Lucina portlandica, andProtocardia dissimilis among lamellibranchs ; Natica clegansand Cerithiitm p)ortlandicnm among gastropods. All these Table-case gj^ells may be better studied in the Table-case, as well as GUIDE FOSS. INVERT. PLATE Fossil in Corallian rock from Weymouth,Part of a Shell-bank in London Clay at Fareham, Hants. .[To face p. 135. MOLLUSCA (except CEPHALOPODA). 135 Pterocera oceani, Plearotomaria riigata, Sowerhya Diikei, GalleryAstarte ntgosa, and many species of Trigonict. Note also laroje borins^s of Litliodomus. The shells of the Kimmeridge Clay are mainly from Table-caseWeymouth, Dorset; Wootton Bassett, Wilts ; the neighbour- 10-hood of Oxford; and Hartwell, Bucks. The following arenoteworthy : the large Pleurotomaria reticulata, the D-shapedOstrea deltoidea, the common and characteristic Exogyra vir-gula, Gryphaea dilatata with its thickened hinge, well shownin sections, a Gryphaea with a supposed pearl, Protocardia[Cardium\ striatida, Astarte hartwellensis, various Trigonias,Goniomya literata, and Thracia depressa. A slab of Kim-meridge Clay filled
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Keywords: ., bookauthorbr, bookcentury1900, bookdecade1900, booksubjectfossils
