BRITISH FOSSILS, 



Decade III. Plate VIII. 



GALERITES (GALERITES) ALBOGALERUS. 



[Genus GALERITES. Lamarck. (Sub-kingdom Radiata. Class Echinodermata. 

 Order Echinida;. 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 Galerites. Body hemispheric, sub-globose, or conical ; base more or less 

 flattened ; tubercles irregularly arranged.] 



Synonyms. Conulus alhogalerus, Leske, ap Klein, p. 162, pi. 13, 

 figs. A, B. Echinus albo-galerus^ Gmelin, p. 3181, No. 46. Galerites 

 albo-galerus, Lamarck, vol. iii., p. 306 ; Desmoulins, Tab. Syn. p. 248 ; 

 GoLDFUSs, Pet. Genn., p. 127, pi. 40, fig. 19 ; Stokes, Geol. Trans., 2nd 

 series, vol. ii., p. 406, pi. 45, figs. 14, 15 ; Desor, Monog. des Galerites, 

 p. 4, pi. 1, figs. 4-11, and 13, fig. 7 ; Agassiz and Desor, Cat. Rais. des 

 Echin., Ann. des Sciences Nat., 3rd ser., vol. vii., p. 148. Conulus albo- 

 galerus, Fleming, Brit. An. p. 481 ; Mantell, Geol. Sussex, pi. 17, figs. 8, 

 20; Parkinson, Org. Rem., vol. iii., pi. 2, figs. 10, 11. Echinoneus 

 albo-galerus, De Blainvilee, Zooph., p. 194. Discoidea albogalera^ 

 Agassiz, Prod., p. 186; Bronn, Lethsea Geog., p. 614, pi. 29, fig. 18 

 a, b. Galerites cretosus, Mantell, Medals, vol. i., p. 384. 



Forma a. Normalis. (The figures quoted above represent the typical 

 form.) 



Forma ^. Tumidior. Galerites conica, Agassiz ; Desor, Monog. des 

 Galerites, p. 16, pi. 1, figs. 12-19. Conulus albogalerus, Mantell, Geol. 

 Sussex, pi. 1 7, figs. 8 and 20. 



Diagnosis. G. corpore alto, conoideo, ad basin angulaio tuberculis 

 infra rnajoribus ; ano elliptico, infero, submarginali^ margine incrassato sub- 

 rostrato ; poris ambulacralibus ad orem compacte confertis. 



The general form of the Galerites albogalerus is that of a sugar-loaf, 

 pyramidal or conical, with a flattened base ; varying from a tall pyramid 

 with very steep sides to a short one with swelling sides, always com- 

 pressed and subangular at the junction of the sides or dorsal surface 

 with the base or ventral surface. Above, it is divided into ten areas 

 by the straight radiating avenues of pores ; the interambulacral areas 



[ill. viii.] B 



