EE\qSION- OF PALEOZOIC STELLEROIDEA. 131 



XENASTER MARGARITATUS Simonovitsch emend. Schondorf. 



Plate 24, figs. 1,2. 

 Xenastcr margaritatus (part) Simonovitsch, Sitzb. mat.-naturw. Classe Akad. 

 Wiss., Wien, vol. 64, Abt. 1, 1871, p. 88, pis. 1, 2.— Schondorf, Palseon- 

 tographica, vol. 56, 1909, pp. 43, 106, pi. 7, figs. 1, 3, 4; pi. 8, fig. 1; pi. 11, 

 figs. 2, 3, 10, 11 (complete sjiionymy given here); Jahrb. nassauisch. Ver. 

 Naturk., Wiesbaden, vol. 62, 1909, p. 26, pi. 2, figs. 1, 2.— Spencer, Mon. 

 Brit. Pal. Asterozoa, pt. 1 (Palseontogr. Soc. for 1913), 1914, p. 30. 



This species is one of the best described and illustrated of Paleozoic 

 starfishes and does credit to its author, and to its subsequent reviser, 

 Schondorf. It occurs rarely in the Lower Devonic (Upper Coblcn- 

 zian) as natural molds at Niederlahnstem on the Rhine, Germany. 



XENASTER DISPAR Schondorf. 



Xenaster margaritatus (part) Simonovitsch, Sitzb. mat.-naturw. Classe Akad. 



Wiss., Wien, vol. 64, 1871, Abt. 1, pi. 2, figs. 2, 2a, 2b. 

 Xenastcr dispar Schondorf, Palseontograpliica, vol. 56, 1909, pp. 50, 84, 106, 



pi. 9, fig. 1; pi. 11, fig. 13; Jahrb. nassauisch. Ver. Naturk., ^^'iesbadell , vol. 



62, 1909, p. 28, pi. 3, fig. 3. 



From the Upper Coblenzian at Niederlahnstein, and Miellen, 

 Germany. 



XENASTER ELEGANS Schondorf. 



Xenaster margaritatus Follmann (not Simonovitsch), Jahrb. naturh. Ver. preuss. 



Rheinl., etc., vol. 48, 1891, p. 150. 

 Xenaster elegans Schondorf, Palseontographica, vol. 56, 1909, -pp. 53, 107, pi. 9, 



figs. 2, 3; pi. 11, figs. 4, 12; Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 



62, 1909, p. 40, pi. 4, figs. 6, 7. 



From the Lower Devonic (Coblenz quartzite) at Konigstuhl, near 

 Rhens, Germany. 



XENASTER (?) RHENANUS (Muller). 



Asterias {Archseasterias) rhenana Mijller, Verh. naturh. Ver. preuss. Rheinl., 



etc., vol. 12, 185.5, p. 6, pi. 1, figs. 4-6. 

 Xenaster (?) rhenana Schondorf, Palneontographica, vol. 50, 1909, pp. 55, 107, 



text fig. 2 (complete synonymy given here); Jalnb. nassauisch. Ver. Naturk., 



Wiesbaden, vol. 62, 1909, p. 28. 



This species is based upon mcomplete material and can not be 

 made out fully. It seems probable that it is a species of Xenaster 

 and closely related to X. margaritatus Simonovitsch. The examples 

 are in the Berlm Museum and were found in the Lower Devonic at 

 Winningen, near Coblenz, and Kemmenau, near Ems, Germany. 



Genus AGALMASTER Schondorf. 



Text fig. 9. 

 Agalmaster Schondorf, Palseontographica, vol. 56, 1909, pp. 58, 107; Jahrb. 

 nassauisch. Ver. Naturk., Wiesbaden, vol. 62, 1909, p. 29. 



Original remarTcs. — Agalmaster differs from Xenaster in the following 

 characters: Forms larger, broader rayed, with flat actmal but highly 

 arched abactinal plates. Supramarginals much stronger than the 

 large inframarginals and projecting considerably beyond these. 



