REVISION OF PALEOZOIC STELLEROIDEA. 167 



STENASTER (?) OBTUSUS (Forbes). 



Asterias primseva SALTER and SOWERBY, Quart. Jour. Geol. Soc. London, vol. 



1, 1845, p. 8, 20 (table) (rumen' nudum). 

 Uraster obtusus FORBES, Mem. Geol. Surv. Gt. Britain, vol. 2, pt. 2, 1848, p. 463; 



Mem. Geol. Surv. United Kingdom, dec. 1, 1849, p. 2, pi. 1, fig. 3. MURCHI- 



SON, Siluria, 1854, p. 182, fig. 17. 

 Palxaster obtusus SALTER, Ann. Mag. Nat. Hist., ser. 2, vol. 20, 1857, p. 326. 



WRIGHT, Mon. British Foss. Echinod., Oolitic, vol. 2, pt. 1 (Paleeontogr. 



Soc. for 1861), 1862, p. 24. SALTER, Mem. Geol. Surv. Gt. Britain, vol. 3, 



1866, p. 289, pi. 23, fig. 1. 

 Stenaster (?) obtusus STURTZ, N. Jahrb. fur Min., etc., 1886, vol. 2, p. 153; Verh. 



naturh. Ver. preuss. Rheinl., etc., vol. 50, 1893, pp. 41, 56. 

 Stenaster obtusus SPENCER, Mon. Brit. Pal. Asterozoa, pt. 1 (Palseontogr. Soc. for 



1913), 1914, pp. 22, 23, 31, text fig. 21, pi. 1, figs. 6, 7. 



The little that is known of this species appears to be in harmony 

 with the characters of Stenaster as here defined. It occurs in the 

 Caradoc beds (Ordovicic) at Drumcannon, Waterford, Ireland, and 

 in the Bala rocks west of Bala Lake (Moel-y-Garnedd) , North Wales. 



STENASTER (?) CORONELLA (Salter). 



Palxaster coronella SALTER, Ann. Mag. Nat. Hist., ser. 2, vol. 20, 1857, p. 326. 

 WRIGHT, Mon. British Foss. Echinod., Oolitic, vol. 2, pt. 1 (Palseontogr. 

 Soc. for 1861), 1862, p. 25. 



Stenaster (?) coronella STURTZ, N. Jahrb. fur Min., etc., 1886, vol. 2, p. 153. 



The description of this species is very short and almost nothing is 

 known of its characters. It occurs in the May Hill sandstone (Siluric) 

 at Gunwick Mill, Malvern, England. 



STENASTER (?) CONFLUENS Trautschold. 



Stenaster conftuens TRAUTSCHOLD, Nouv. Mem. Soc. Imp. Nat. Moscou, vol. 14, 

 1879, p. 11, pi. 2, fig. 5. SCHONDORF, Palseontographica, vol. 56, 1909, p. 337. 



Based on a fragment of the distal part of a ray. Appears to be 

 a crj^ptozonian. Generic position unknown. From the Upper Car- 

 boniferous (Moscovian) of Moscow, Russia. 



Genus TETRASTER Nicholson and Etheridge (emend.). 



Plate 33, fig. 4. 



Tetraster NICHOLSON and ETHERIDGE, Mon. Silurian Foss. Girvan Dist., Ayrshire, 

 fasc. 3, 1880, p. 324, pi. 21, figs. 3-8 (not figs. 1-2= Eudsonaster batheri, and 

 9-10== Urasterella girvanensis) . 



The name has reference to the four columns of actinal plates of 

 the rays. 



Remarks. The authors of Tetraster distinguished their genus from 

 Palseaster on the ground that it had on the actinal side but four 

 columns of plates, while that genus as typified by P. matutinus } now 

 Hudsonaster matutinus, has six. In this definition they are correct, 

 but they complicated their good intentions not only by referring to 



