Plate XIII. 



Tiarechinus princeps Laube. 

 P. 11, 64. 



Fig. 150. The sjDecimen from the "K. K. Geologische Eeichs-Anstalt", Yienna, dorsal view; maguified abont 



niue times. 



Fig. 151. The same, ventral view. 



Fig. 152. The same, showing the plates.^^ 



Fig. 153. The same, side view. 



Fig. 154. The same, showing the plates. 



Fig. 155. Tbe calyx of the same. 



Fig. 156. One of the sexual? pores. 



Fig. 157. Granulation of the intenadia. 



Fig. 158. The adoral part of an ambulacnim. 



Fig. 159. The aboral part of the same. 



Fig. 160. One of the large tuberoles of the interradia. 



Fig. 161. The specimen from the "K. K. Hof-Mineralien Cabinet" Vienna, ventral view. 



Fig. 162. Another specimen, from the same collection, dorsal view. 



