REPORT ON THE HOLOTHURIOIDEA. 151 



PLATE X. 

 Peniagone lugubris, n. sp. 

 Fig. 1. Side view : natural size. 



Peniagone horrifer, n. sp. 

 „ 2. Side view ; natural size. 



Peniagone wyvillii, n. sp. 

 „ 3. Ventral view ; natural size. 

 „ 4. Side view ; natural size. 



Peniagone atrox, n. sp. 

 „ 5. Side view ; natural size, a, the brim-like fold on the left side of the dorsal 

 surface. 

 All^the animals which are figured on this plate are highly macerated and deformed 

 by long immersion in spirits, consequently I am not quite sure of the correctness of my 

 idea of their true shape. 



PLATE XI. 



Lcetmogone wyville-thomsoni, Theel. 

 Fig. 1. Side view ; natural size, a, genital process. 



PLATE XII. 



Lcetmogone ivyville-thomsoni, Theel. 

 Fig. 1. Dorsal view; two-thirds the natural size, g, genital process. 

 ., 2. Ventral view ; two-thirds the natural size. 



PLATE XIII. 



Lcetmogone violacea, Theel. 

 Fig. 1. Side view ; natural size. 

 „ 2. Ventral view ; natural size. 

 ,, 3. Dorsal view ; natural size. 



PLATE XIV. 



Lcetmogone spongiom, Theel. 

 Fig. 1. Side view ; natural size. 

 ,, 2. Dorsal view ; natural size. 

 „ 3. Ventral view ; natural size. 



