BRITISH FOSSILS. 



Decade I. Plate VII. 



GALEEITES (DISCOIDEA) SUBUCULUS. 



[Genus GALERITES. Lamakck. (Sub-kingdom Eadiata. Class Echinodermata. 

 Order Echinidae. Family Cassidulidse.) Body more or less hemispherical, always tumid ; 

 ambulacra simple, continuous, radiant ; mouth central, inferior ; anus inferior or sub- 

 marginal ; tubercles perforate.] 



[Sub-genus Discoidea. Body hemispheric, circular, flat-based ; tubercles in regular 

 series ; inside strengthened by strong ribs.] 



Synonyms. Discoides suhuculuSj Klein, t. 14, f. 57 (copied in Enc. 

 IVieth., pi. 153, f. 14-17). Echinites subuculus, Leske. ap. Klein, p. 171, 

 Echinus subuculus^ Gmelin, p. 3183. Galerites rotularis^ Lamarck, An. 

 sans Yert. iii., p. 309. Discoides subuculus, Parkinson, vol. iii., p. 21, 

 pi. II., %. 7. Galerites subuculus, Goldfuss, p. 129, pi. 41, f. 2. Dis- 

 coidea subucidus, Bronn, Lethsea, p. 615, t. 29, f. 29- Discoidea rotularis, 

 Gray, Ann. Phil., 1825 ; Agassiz, Prod., p. 186. Discoidea subuculus^ 

 Desor, IMon. Gal., p. 54 ; Agassiz and Desor, Cat. Pais, des Echin. Ann. 

 Sc. Nat., 3rd Ser., t. 7, p. 146. Galerites {Discoidea) subuculus, Roemer, 

 Nord Deutsch. Kreide Geb., p. 31 ; JMCller, Aach. Kreideformation, p. 8. 



Diagnosis. G. (^Discoidea) parva^ hemisphcBrica^ plus minusve con- 

 vexa, marginibus rotundatis^ ventre plus minusve excavato ; areis ambula- 

 cralibus centro-lateralibus dimidium arearum inter ambidacralium adcequan- 

 tibus ; ano magno ; assulis ambulacralibus 4 ad assulam inter ambidacralem. 



Var. a. Ambitu orbicularis marginibus comjjressiusculis. — D. subuculus 

 auctorum, Loc, in arena viridi. 



Var. y8. Ambitu subpentagonali, marginibus rotundatis.- — D. infera, 

 Desor, Cat. Pais., p. 147 ? Loc, in cretd alba. 



A wretched figure in Plott's History of Oxfordshire," (1677, p. 140, 

 pi. 8, f. 9,) is supposed to be the first representation of this fossil. It is 

 described by Plott, as a " Button-stone from Teynton, a mere production 

 of nature, except we should take it for a new sort of echinite not yet 

 discovered, which is wholly left to the reader's choice." Lister, in his 

 book, " De Lapidibus Turbinatis," copies it as an echinite. Klein 

 quotes the same figure for his Discoides subuculus^ and gives figures 

 himself (t. 14, f. 57) sufficiently recognisable. It is the type of the 

 genus Discoides of Klein, separated by that author from his genus 

 [i. vii.] H 



