

from the Marlstone of Yorkshire. 



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reverse is the case ; forming a character at once evident and 

 distincUH'OaidoiuM ; 



To this species I have given the name of Ophiura [the 

 specific name is not inserted in the manuscript]. 



The marlstone on the Yorkshire coast generally averages 

 in thickness about 130 ft. Its ordinary appearance is that of 

 a series of shales and beds of lamellar sandstone, in some 

 parts divided by layers of ironstone of various thicknesses. 

 These occur chiefly in the first 30 ft. from the upper alum 

 shale, and the division from which is marked by a band of 

 irony nodules, so cemented together as to form a solid stra- 

 tum, about 6 in. in thickness. This seam, as far as I have 

 been able to discover, contains no fossils, except Ammonias 

 Hawskemw/s, and a species of small Trochus. Below this, 

 the ironstones are divided for the space of about 12 ft., with 

 dark shales, filled with a profusion of fossils, of which the 



11 2 



