CLYPEUS. 



361 



Section A. Anal valley extends from the disc to the border. 

 A. Species from the Inferior Oolite. 

 Clypeus Plotii, Klein. PI. XXVIII and XXIX. 



Polar Stone. 

 echinites. 



— clypeatus. 



Echinus discoides. 

 Clypeus Plotii. 



Echinus sinuatus. 

 Clypeus sinuatus. 

 Galerites umbrella. 



PATELLA. 



ECHINITES SINUATUS. 

 NUCLEOLITES PATELLA. 

 ECHINOCLYPEUS UMBRELLA 



PATELLA. 



Galerites patella. 



echinoclypeusumbrella 

 Clypeus patella. 



— sinuatus. 



— angustiporus. 



— excentricus. 

 Nucleolites sinuatus. 



Clypeus patella. 



Nucleolites sinuatus. 



Clypeus Plotii. 

 Clypeus sinuatus. 



Plot, History of Oxfordshire, tab. ii, figs. 9 and 10, 1677. 



Lister, Lapidibus Turbinatis, p. 224, pi. vii, fig. 27, 1678. 



Llhwyd, Lithopbylacii Britannici Icbinographia, tab. xiii, p. 48, 

 No. 971, 1698. 



Morton, Natural History of Nortbamptonsbire, p. 233, 1712. 



Klein, Natural. Disposit. Ecbinodermat., tab. xii, p. 22, 1734. 



Leske, Additamenta ad Kleinii Ecbinodermatum, p. 157, 1768. 



LinnsBus, Systema Naturse, by Turton, vol. iv, p. 144, 1801. 



Parkinson, Organic Remains, vol. iii, p. 24, pi. ii, fig. 1, 1811. 



Lamarck, Animaux sans Vertcbres, torn, iii, p. 23, No. 15, 1816. 



Lamarck, Animaux sans Vertebres, torn, iii, p. 23, No. 14, 1816. 



Scblotbeim, Petrefacktenkunde, i, p. 310, 1820. 



Defrance, Diet, des Sciences Naturelles, tom. xxxv, p. 213, 1825. 

 . De Blainville, Diction, des Sciences Naturelles, tom. Ix, p. 189, 

 1830. 



De Blainville, Diet, des Sciences Naturelles, tom. Ix, p. 189, 1830. 



Deslongchamps, Encycloped. Metbodique, pi. cxliii, figs. 1, 2. 



Id., Enc, tom. ii, p. 434, No. 14. 

 .De Blainville, Manuel d'Actinologie, p. 208, 1834. 



Agassiz, Prodrome, Mem. Soc. d'Hist. Nat. Neucbatel, tom. i, 

 p. 186, 1835. 



Agassiz, Ecbinodermes Fossiles de la Suisse, 1st part, p. 56, 

 tab. v, figs. 4—6, 1839. 



Morris, Catalogue of British Fossils, p. 50, 1843. 



Morris, Ibid. 



Agassiz, Cat. raisonnee, An. Sc. Nat., tom. vii, p. 156, 1847. 



M'Coy, Annals and Magazine of Natural History, p. 417, 1848. 

 Forbes, Memoirs of the Geol. Survey, decade i, 1849. 

 Wright, Annals and Mag. of Nat. Hist., vol. ix, p. 306, 1851. 

 Bronn, Lethsea Geognostica, Band, ii, p. 152, tab. xv, fig. 9, 



1852. 

 Forbes, in Morris's Catalogue of British Fossils, 2d ed., p. 84, 



1854. 

 Salter, in Hull's Memoirs of the Geological Survey, 1857. 

 Desor, Synopsis des Echinides Fossiles, PI. XXXV, p. 276, 1858. 



Dimensions. — Height, one inch and seven tenths ; antero-posterior and transverse 

 diameters nearly equal, measuring four inches and four tenths. 



