:r 



KCHINODEKMS OF THK JUilTlSH LSLES 



row , the mid- ventral ambulacrum with a few, more or less rudi- 

 mentary tube-feet. A single series of papillae usually alternating 

 large and small, in each dorsal ambulacrum and along the sides 

 of the body. Skin as in Deima. 



Two species are known from the N.E. Atlantic, viz. Oneiro- 



FiG. 220. — Oneirophanta mutabilis ; dorsal (1) and ventral side (2). 

 Diminished. (After Grieg, " Michael Sars " Echinod.) 



phanta mutabilis Theel (Fig. 220), found in the Bay of Biscay and 

 between Portugal and the Azores, ca. 1800-4870 m., also known 

 from the Indian and the Pacific Oceans, down to ca. 5300 m. ; 

 0. alternata Perrier, from between Portugal and the Azores, 

 4060-5005 m. (" Talisman "). The tw^o species are thus dis- 

 tinguished : 

 Larger and smaller papillae alternating very regularly in both dorsal 



and lateral series (" Talisman " Holoth., p. 380, Pis. XTV. 3-4, 



XVIII. 16-21) O. alternata Perr. 



Larger and smaller papillae in dorsal and lateral series not regularly 



alternating C Challenger r Holoth., i., p. 62, Pis. XXI.-XXII. ; 



" Michael iSars " Echinod., p. 5, Pi. II.) . O. mutabilis Theel 



[Family Psychropotid.^] 



Body elongate, sometimes very depressed, often with a large 



dorsal appendage. Skin thick, gelatinous. A marginal fringe of 



appendages around the ventral surface of body. No non-retractile 



lateral papillae. Tentacles large, with broad disk. Tube-feet 



