132 



BULLETIlSr 



UNITED STATES NATTOKAL 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. 



Genoholotyfe (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- 

 framarginals, 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 

 marginals and, further, 

 there are far more of 

 these pieces between 

 the inframarginals and 

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

 stead of one (as in A. miellensis). 



AGALMASTER MIELLENSIS Schondorf. 



Text fig. 9. 



Agalmaster miellensis Schondorf, Palaeontographica, vol. 56, 1909, pp. 58, 107, 

 text fig. 3; pi. 8. fig. 4; pi. 9, fig. 4; pi. 11, figs. 1, 5; Jahrb. nassaiiisch. 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. 

 Agalmxister grandis Schondorf, Palaeontographica, 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. 



Fig. 9.— Agalmaster miellensis, after Sch6ndorf. Schematic 

 arrangement of abactinal plates. i?2 and r^, second and 

 third proximal radialia; jr\, primary interradialia; cdp, 

 CENTRAL plate; mdp, madreporite; mo, supramarginalia; 

 ■mu, infeamarginalu; Pifm, primary interradialla. 



