REVISION OF PALEOZOIC STELLEROIDEA. 241 



and 14 plates in the same distance in the central portion, while 

 toward the extremities there are 20 or more in the same space. 

 The marginal plates are subhexagonal, a little longer than wide, and 

 ornamented by long slender spines on their outer margins. 



"This is a much larger and more robust species than the Eugaster 

 logani, and in its entire condition it is the largest star-fish known in 

 our palaeozoic rocks. 



" Geological formation and locality. In the Chemung group. The 

 specimen is in a brownish-gray sandstone, which weathers to a very 

 light ashen color. It was received from Henry S. Randall, Esq., of 

 Cortlandville [New York], in the vicinity of which place it was ob- 

 tained." 



The holotype, an imprint, is in the American Museum of Natural 

 History, No. 4472. 



Family ENCRINASTERID^E, new name. 



Aspidosomatidse GREGORY, Geol. Mag., dec. 4, vol. 6, 1899, p. 351; Treat. Zool., 

 vol. 3, Echinoderma, 1900, p. 250. SCHONDORF, Palseontographica, vol. 57, 

 1910, pp. 55-61. 



Palxgoniasteridce STURTZ (part), Palseontographica, vol. 36, 1890, p. 246 (contains 

 Aspidosomella and Palxaster). 



Lysophiurae with boot-shaped ambulacralia ventrally, and large 

 disks that are bordered with simple marginalia. Apparently only 

 the inframarginals are present. 



As Aspidosoma Goldfuss is preoccupied, this name can no longer 

 be used for the family name. Encrinaster Haeckel replaces it and 

 therefore becomes the base of the family designation. 



The family has the single genus Encrinaster. 



Genus ENCRINASTER Haeckel. 

 Plate 35, text fig. 28, 29. 



Aspidosoma GOLDFUSS (not Aspidosoma Fitzinger 1843, Keptilia), Verh. naturh. 

 Ver. preuss. Rheinl., etc., vol. 5, 1848, pp. 145-146. SIMONOVITSCH, Sitzb. 

 d. mat.-naturw. Classe Akad. Wiss., Wien., vol. 64, Abt. 1, 1871, p. 103. 

 ZITTEL, Handb. Pal., vol. 1, 1879, p. 451, fig. 322. STURTZ, Palseonto- 

 graphica, vol. 32, 1886, p. 92; N. Jahrb. fiir Min., etc., 1886, vol. 2, p. 151; 

 Verh. naturh. Ver. preuss. Rheinl., etc., vol. 50, 1893, pp. 38, 55. SCHON- 

 DORP, Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 62, 1909, p. 35; 

 Palseontographica, vol. 57, 1910, pp. 1-63. SPENCER, Mon. Brit. Pal. Aste- 

 rozoa, pt. 1 (Palseontogr. Soc. for 1913), 1914, pp. 23, 24, 49. 



Encrinaster HAECKEL, Gen. Morphologie, vol. 2, 1866, p. Ixvii (genolectotype 

 Aspidosoma arnoldi Goldfuss). 



Diagnosis. Animals attaining large size, with a comparatively 

 large disk. Rays five, more or less petaloid, slender and long, with 

 wide and open ambulacral furrows. 



