Explanation of Plate VII. 



Fig. 1. Astrogomphus rudis Ver. Ventral side of the disk and the 

 bases of two arms. X 8. 



Fig. 1<7. The same specimen. Dorsal side. X 12. 



Fig. 2. Ophiocamax austera Ver. Profile view of a row of spines 

 from near the base of an arm. X 8. The upper spines 

 are more divergent than represented in the figure. 



Fig. 3. Astroschema nnttingii Ver. Ventral side of the disk and 

 the bases of two arms. X 8. 



Fig. 3a. The same specimen. Dorsal side. X 12. 



