REPORT ON THE HOLOTHURIOIDEA. 171 



b, inner layer of the integument with scattered spicula ; c, muscular 

 layer. 



Lcetmogone unjville-thomsoni, Theel. 

 Fig. 14. Diagrammatic view of a transverse section of the thick terminal part of a 

 tentacle, a, tentacular cavity ; b, branched canals lying within the thick 

 sole-like terminal part. 



PLATE XLV. 



Oneirophanta mutabilis, The'el. 

 Fig. 1. Plexus of pigmented nerves from the integument. 

 „ 2. Nerve-cell produced into three processes. 

 ,, 3. Nerve-cell produced into several processes. 

 ,, 4. Portion of a nerve-branch from a dorsal process. 

 ,, 5. Nerve-ring, a, branches passing to the tentacles ; b, radial nerve-stems ; c, 



branches passing to the oral disk and the oral cavity. 

 „ 6. Cells from the connective tissue of the integument, a, cell produced into 

 five processes ; b, cell with three processes ; c, cell with two processes. 



PLATE XLVI. 



Ilyodcemon maculatus, The'el. 

 Fig. 1. View of the reproductive organs with the branches of the one side removed. 

 a, efferent duct. 



Lcetmogone wyville-thomsoni, Theel. 

 „ 2. A portion of the female reproductive organs. 

 „ 3. A portion of the male reproductive organs. 



Euphronides depressa, n. sp. 

 ,, 4. View of the female reproductive organs taken from the animal dredged at 

 Station V. Twice the natural size. 



Deima validum, The'el. 

 ,, 5. View of the reproductive organs ; the tubes of the one side removed. Twice 

 the natural size, a, efferent duct. 



Oneirophanta mutabilis, Theel. 

 ,, 6. View of the male reproductive organs. Twice the natural size, a, efferent 

 duct. 



