BRITISH FOSSILS 



Decade IV. Plate VII. 



ANANCHYTES (HOLASTER) SUBGLOBOSA. 



[Genus ANANCHYTES. Lamarck. (Sub-kingdom Kadiata. Clttss EcMnodermata. 

 Order Echinoidea. Family Ananchytidae.) Body orbicular, oblong, or obscurely cordate, 

 tumid ; with homogeneous ambulacra, convergent on the vertex, all plane, or with the an- 

 terior ambulacrum in a shallow furrow. No fascioles. Vent terminal, marginal or 

 •supra-marginal. Apical disk elongated, and composed of four perforated genital and 

 five perforated ocular plates. Tubercles perforate, their bosses crenulate. Spines 

 minute. No dental apparatus. 



Sub-genus Holaster. Body cordate. Vent terminal and supra-marginal.] 



Diagnosis. A. amhitu subcordato ; testa crassd, tumidd, lateribus 

 rotundatis. 



Forma a. Normalis, tumida, cordata. 

 Forma jS. Expansa^ depressa. 



Ananchytes spatangiformis, Roemer, Norddeutsch. Kreide Geb., 

 p. 35, pi. 6, fig. 19. 



Forma y. Globosa, suborbicularis. 

 Forma S. Cordata, tumida, antice sulcata. 



Synonyms. — Spatangus subglobosus, Leske ap. Klein, Nat. Disp. 

 Echin., p. 240, pi. 54, f. 2, 3. (1778.) Defrance, Diet. Sc. Nat., vol. i.^ 

 p. 94. GoLDFUSS, Petrefacta Germanica, p. 148, pi. 45, f. 4. Desmoulins^ 

 Tabl. Synopt., p. 398. 



Echinus subglobosus, Gmelin. 



Holaster subglobosus, Agassiz, Prod, in Mem. Soc. d'Hist. Nat* de Neu- 

 cliatel, p. 183. Echin. Suisses, pt. i, p. 13, pi. 2, fig. 7, 9. Roemer, 

 Norddeutsch. Kreide Geb., p. 34. Reuss, Boehm. Kr., p. 57. Sismonda, 

 Ech. Foss. Nissa., p. 5. Agassiz and Desor, Cat. Raisonne des Echinides, 

 Ann. des Sc. Nat., 3d ser., vol. viii. p. 27. Dixon, Geol. Sussex, p. 341, 

 pi. 2, f. 2. and 1 and 2. 



The figures given by Leske of this well-known Echinite were 

 sufficiently characteristic to prevent the commission of many sub- 

 sequent errors. Lamarck, however, applied the name to a tertiary 

 fossil. Since his time palaeontologists have been content to preserve 

 Leske's name for this species. 



[iv. vii.] 4 H 



