152 THE VOYAGE OF H.M S. CHALLENGER. 



PLATE XV. 

 Orphnurgus asper, Theel. 

 Fig. 1. Ventral view; natural size. 

 „ 2. Dorsal view ; natural size. 



PLATE XVI. 



Ilyodcemon maculatus, The^el. 

 Fig. 1 . Side view ; natural size. 

 „ 2. Dorsal view ; natural size. a, anus ; b, the space where the pores of the 



madrep'oric canal are situated ; c, genital process. 

 ,, 3. Ventral view ; natural size. 



PLATE XVII. 



Paronychia moseleyi, n. sp. 

 Fig. 1. Ventral view ; natural size. 

 „ 2. Dorsal view ; natural size. 



PLATE XVIII. 



Deima validum.. Theel. 

 Fig. 1. Side view ; natural size. 



PLATE XIX. 



Deima validum, Theel. 

 Fig. 1. Dorsal view ; two-thirds the natural size. 



„ 2. Ventral view ; two-thirds the natural size, a, the anterior aperture closed and 

 encircled internally by the tentacles ; b, anal aperture. 



PLATE XX. 



Deima fast osum, Theel. 

 Fig. 1. Dorsal view ; natural size. 

 ,, 2. Ventral view ; natural size, m, the anterior aperture closed, inside which the 

 tentacles are situated ; a, anus. 



PLATE XXI. 



Deima fast osum, Theel. 

 Fig. 1. Side view ; natural size. 



Oneirophanta mutabilis, Thdel. 

 „ 2. Side view ; natural size. 



