REVISION OF PALEOZOIC STELLEROIDEA. 



133 



AGALMASTER INTERMEDIUS Schflndorf. 



Agalmaster intermedius SCHONDORF, Palaeontographica, vol. 56, 1909, pp. 82, 

 108, pi. 11, fig. 14; Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 62, 

 1909, p. 30. 



From the Upper Coblenzian at Miellen-on-the-Lahn, Germany. 



Genus RHENASTER Sehondorf. 

 Text fig. 10. 



Rhenaster SCHONDORF, Palseontographica, vol. 56, 1909, pp. 65, 108, pi. 8, fig. 3; 

 pi. 10, figs. 1, 4. 



Remarks. Rhenaster is a small form and differs from Xenaster, 

 Agalmaster, and Devonaster in the complete absence of all abactinal 

 accessory plates, allow- 

 ing the radial and supra- 

 marginal pieces to ad- 

 join one another closely. 

 Dorsal axillary disk ~7=TP?^O g V\C\ 



T i I /I )s~*\-/ sr?~^ ^-' /\S. \V 



areas not completely 

 but almost absent, 

 supramarginals in the 

 main lying wholly upon 

 the inframarginals and 

 the two columns of 

 plates together margin- 

 ing the rays. There 

 also are no accessory 

 plates of any kind on 

 the actinal side. Other- 

 wise the generic struc- 

 ture is that of Xenaster, except that in Rhenaster the first pair of 

 interbrachial marginals are not yet pushed so much orally and they 

 almost take part in margining the axils. Madreporite unknown. 



Genoholotype and only species (one specimen). R. schwerdi Schon- 

 dorf, from the Lower Devonic (Upper Coblenzian) at Dorrbachtal, 

 near Coblenz, Germany. 



Genus EIFELASTER Sehondorf. 



Etfelaster SCHONDORF, Palaeontographica, vol. 56, 1909, pp. 70, 108, pi. 10, figs. 



7,8. 



Remarks. This genus is very closely related to Rhenaster and 

 differs only in that there are small dorsal interbrachial areas between 

 the adjoining proximal portions of the supramarginal columns, and 

 these are filled with a small number of accessory ambital pieces. 

 The outer portion of these ambital areas is made up of the two basal 

 inframarginals that occupy the axils of the ventral side. 





FIG. 10. REENASTER SCHWEKDI, AFTEK SCHONDORF. SCHEMATIC 

 ARRANGEMENT OF ABACTINAL PLATES. SYMBOLS AS IN FIG. 9. 



