LOWf;R HELDERBERG ROCKS. 



3.19 



Dalmania. plkukoptt^. 



Dalniania iiiieiiirus. 



Plate LXXV. Fig. 13 - 18. 



Atap\us micrurus : GREEy, Monograph, p. 56, Cast No. 19, f. 3. 

 Asaphus hausmanni, in part, of authors. 



Pyqidium triangular, convex, somewhat abruptly sloping at the sides, 

 acute, attenuate behind. Axis very prominent, faintly subangular in 

 the middle above, and regularly rounded towards the posterior extre- 

 mity, rigid, scarcely declining below, and abruptly elevated from the 

 posterior marginal border ; a narrow angular ridge extending from the 

 extremity of the axis into the acute spiaiform caudal termination. 



The number of articulations in the axis is twenty or twenty-one, which 

 are strongly defined, and some of the anterior ones slightly bent for- 



