164 THE VOYAGE OF H.M.S. CHALLENGER. 



PLATE XXXIX. 



Psychropotes longicauda, var. monstrosa, n. 

 Fig. 1. The anterior portion of the body with the ventral perisoma, the alimentary- 

 canal, &c., removed to show that system of water-vascular vessels which 

 penetrates or rather constitutes the brim round the body ; twice the natural 

 size, a, the brim which is rather broad especially round the anterior 

 extremity of the body; b, terminal part of the madreporic canal; c, the 

 foremost portion of the reproductive organs ; d, ventral lateral ambulacra ; 

 e, dorsal ambulacra ; /, the two dorsal main canals which connect the dorsal 

 ambulacra and tentacles with the water- vascular ring ; g, passage to the 

 tentacles ; h, a part of the brim deprived of the outer layer of the integu- 

 ment to show more distinctly the close-lying canals which enter the 

 processes round the edge of the brim ; x, processes or pedicels. 



Elpidia verrucosa, Theel. 

 „ 2. Upper view of some pyramidal papillae of the dorsal integument with their 

 deposits, in situ. 



Achlyonice paradoxa, Thdel. 

 ,, 3. A piece of the integument showing holes and cavities. 



Lcetmogone wyville-tkomsoni, Tlidel. 

 „ 4. Inner view of the terminal part of a tentacle, the stem having been cut off ; 

 a, the rest of the stem ; b, holes from canals lying within the thick sole- 

 like end of the tentacle. 



Lcetmogone spongiosa, The"el. 

 „ 5. Traces of wheel in the integument. 

 ,, 6. Traces of star-like deposit in the integument. 



Achlyonice paradoxa, Theel. 

 ,, 7. Traces of three-armed deposit in the integument. 



PLATE XL. 



Oneirophanta mutabilis, Theel. 

 Fig. 1. Injected pseudhsemal vessels from the ventral walls of the intestine, a, the 

 large ventral stem ; b, branches given off to the walls of the intestine ; c, 

 plexus of fine vessels within the walls of the intestine. 

 ,, 2. Ventral view of the digestive tract, showing the pseudhsemal vessels ; almost 



