132 BULLETIN 88, UNITED STATES NATIONAL MUSEUM.. 



\ 



Abactinal interbrachial area small, and occupied in the main by two 



axillary inf ramarginals ; actinally this area has the same structure as 



Xenaster. Madreporite dorsal. 



Genoholotype (the writer here selects the first species). A. miel- 



lensis Schondorf. Other species are A. grandis Schondorf and A. 



intermedius Schondorf, both from the Lower Devonic of Germany. 

 / \ Remarks. The only 



/ \ character that may be 



of generic value and 

 that at present distin- 

 guishes Agalmaster from 

 Xenaster is that in the 

 former genus the supra- 

 marginals margin the 

 rays instead of the in- 

 f ramarginals, as is the 

 case in the latter genus. 

 In a second species (A. 

 grandis) the small ac- 

 cessory interbrachials 

 crowd in between all the 

 pairs of interbrachial 



FIG. 9. AGALMASTER MIELLENSIS, AFTER SCHONDORF. SCHEMATIC marginals and further 



ARRANGEMENT OF ABACTINAL PLATES. R* AND -R 3 , SECOND AND , . ' 



THIRD PROXIMAL RADIAUA; Jn, PRIMARY INTERRADIALIAJ Cdp, tllCre &TQ J&T ID.OTG OI 



CENTRAL PLATE; mdp, MADREPORITE; mo, SUPRAMARGINALIA; ^ggQ pieces between 

 mu, INFRAMARGINALIA; Pifm, PRIMARY INTERRADIALIA. 



the inframargmals and 



adambulacrals; in fact, there are three to four columns of these in- 

 stead of one (as in A. mieUensis). 



AGALMASTER MIELLENSIS Schdndorf. 



Text fig. 9. 



Agalmaster mieUensis SCHONDORF, Palseontographica, vol. 56, 1909, pp. 58, 107, 

 text fig. 3; pi. 8. fig. 4; pi. 9, fig. 4; pi. 11, figs. 1, 5; Jahrb. nassauisch. Ver.' 

 Naturk., Wiesbaden, vol. 62, 1909, p. 29, pi. 3, fig. 2; pi. 4, figs. 1, 2. 



A single specimen with the rays about 43 mm. long was found in the 

 Lower Devonic (Upper Coblenzian) at Miellen-on-the-Lahn, Germany. 



AGALMASTER GRANDIS Schdndorf. 



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



Wiss., Wien, vol. 64, Abt. 1, 1871, pi. 2, figs. 3, 3a. 

 Agalmaster grandis SCHONDORF, Palseontographica, vol. 56, 1909, pp. 62, 108, 



pi. 9, fig. 5; Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 62, 1909, p. 29, 



pi. 3, fig. 1. 



One specimen (Xenaster margaritatus Simonovitsch, part) from 

 the Lower Devonic (Upper Coblenzian) at Niederlahnstein on the 

 Rhine, Germany. 



