J 



FEB 26 1892 



199 



ON THE OCCURRENCE OF THE GENUS PAL.EASTER 



IN THE UPPER SILURIAN ROCKS OF VICTORIA. 



By R. Etheridge, Junr. 



(Plate XXX.) 



The Upper Silurian rocks of Victoria have so far yielded two 

 species of Asteroidea, and one well defined species of Ophiuroidea, 

 whilst a second doubtful species of the latter class is believed to 



£>Yiilt Tho f/^r-mo>- 0.-0 Vot^n^tor.^ V,v.^i7i^V A.T.,n^„ * f-^,^ 4-1 



CORRIGENDA. 



Records, I., Xo. 7, Explanation of Plate xi. 

 Fig. 1, Line 2, for j/osierior read anterior. 

 „ 3j Lines 3 and 4, for posterior read anterior. 



jrAJLiA;AISXJi.K UliliKJlUlUJNAijlS, s/v. nu'v. 



(PI. XXX., lig. 16 & 17.) 



Sp. Char. — Body small; rays moderately long and rather acutely 

 pointed, fifteen millimeters from the actinial centre to the apices; 

 interbrachial angles broad and obtuse; abactinial surface unknown. 

 Ambulacral avenues wide in comparison to the size of the body, 

 deep, very gradually tapering, the sides more or less straight 

 walled ; ambulacral plates about twenty in number on each side, 

 transversely oblong, bearing more or less pyriform pores ; adamb- 

 ulacral plates quadrangular, smaller than the marginal plates, 

 placed along the prominent edges of the ambulacral avenues ; 



* Prod. Pal. Vict., Dec. I., 1874, p. 41, t. 10, f. 1. 

 t Ibid, p. 42, t. 10, f. 2 and 3. 

 X Geol. Mag., 1889, vi. (3), p. 24. 



Dec, 1891. 



