REVISION OF PALEOZOIC STELLEEOIDEA. 241 



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

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

 The marguial plates arc subhexagonal, a httle 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 knowai in 

 our palaeozoic rocks. 



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

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

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

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

 tained." 



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

 History, No. 4472. 



Family ENCRINASTERID^, new name. 



Aspidosomatidx 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. 



PalsegoniasteridcB Sturtz (part), Palseontographica, vol. 36, 1890, y>- 246 (contains 

 Aspidosomella and Palxaster). 



Lysophiura) with boot-shaped ambulacraUa ventrally, and large 

 disks that are bordered with simple marginaha. 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, Reptilia), 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, Palaeonto- 

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

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

 dorf, 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, witli 

 wide and open ambulacral furrows. 



