25° 



DISCOVERY REPORTS 



Fig. 5. Part of oral side of Ophiacantha vivipara, Ljungman (a), and of 

 O. vivipara, vai. pentactis, n.var. (b). x6. 





Fig. 6. ophiacantha densispina J n.sp. a, Part of oral side, x6. b, Dorsal arm plates, x8. r, Spicules 

 from bursal wall, with prolongations forming spines protruding into the body cavity. Xi35. 



