96 BULLETIN 88^ UNITED STATES NATIONAL MUSEUM, 



disk plate is encircled by a ring of but 5 small accessory disk pieces, 

 separating the former from the next ring of 10 much larger plates 

 that are the primary pieces of the radial and supramarginal columns. 

 Genoholotype and only species. — Cadaster latiscutatus Sandberger. 

 Restricted to the Lower Devonic of Germany. 



SPANIASTER LATISCUTATUS (Sandberger). 

 Plate 12, figs. 1, 2; text fig. 8. 



Coelaster latiscutatus Sandberger, Verst. d. rheinischen Schicht. Nassau, 1855, 



p. 381, pi. 35, figs. 1, la. 

 Xenaster simplex Simonovitsch, Sitz. d. mat.-naturw. Classe Akad. Wlss., Wien, 



vol. 64, Abt. I, 1871, p. 97, pi. 3, figs. 1, la. 

 Spaniaster latiscutatus Schondorf, Palaeontographica, vol. 56, 1909, pp. 73-82, 



109, pi. 8, fig. 2; pi. 10, figs. 2, 9, 10; pi. 11, fig. 9 (complete synonymy given 



here); Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 62, 1909, p. 31, pi. 



5, figs. 1-3, text fig. 2. 



The Sandberger specimen, showing only the abactinal side, was 

 found in the Lower Devonic Spiriferensandstein at Unkel, near 

 Bonn, Germany. Another specimen from the Lower Coblenzian 

 quartzite has been recently found at Bienhorntale, near Coblenz; 

 this shows both sides. Still another is from the Lower Coblenzian 

 at Oberstadtfeld in the Eifel, The holotype of X. simj^lex is from the 

 Upper Coblenzian at Niederlahnstein on the Rhine. 



Genus MIOMASTER Schondorf. 



Plate 8, fig. 3. 



Miomaster drevermanni Schondorf, Jahrb. nassauisch. Ver. Naturk., Wiesbaden, 

 vol. 62, 1909, p. 38, pi. 3, fig. 4; pi. 4, fig. 3. 



Eemarks. — This genus is most closely related to Spaniaster, in 

 that both have the single axillary interbrachial plates and the infra- 

 marginals and supramarginals are directly superposed. They differ 

 from one another mainly on the abactinal side, though this area is so 

 poorly preserved in Miomaster that almost nothing definite can be said. 

 Schondorf illustrates a section thi'ough the rays that shows the 

 presence of single columns of very small accessory pieces between 

 the radialia and supramarginalia. In the description, however, he 

 states: "One can not positively determine whether the supra- 

 marginal plates are separated from the median pieces by small 

 accessory ossicles, or whether the three dorsal columns were closely 

 adjoining." The central disk area is also too much disturbed to make 

 out the skeletal arrangement. There appear to have been small 

 interbrachial abactinal areas. Under these circumstances, the genus 

 Miomaster can not be said to be well estabUshed, and its final dispo- 

 sition is dependent on finding better preserved material. 



GenoTiolotype and only species. — M. drevermanni Schondorf (as 

 cited above). A single example was found by Drevermann in the 

 Upper Coblenzian at Mellen-on-the-Lahn, Germany. The holotype 

 is in the Senckenberg Museum, Frankfort-on-thq-Main. 



