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



processes ; these as well as the rest of the terminal part of the tentacles are provided 

 with a number of small, branched, retractile projections devoid of deposits. The 

 calcareous deposits (PI. XXXV. fig. 18) do not he very close together, and vary generally 

 in size, the largest ones having their arms measuring about 0"16 mm. and their elongated 

 rod-like central part of about the same length. The ends of the tentacles as well as of 

 the pedicels contain spicula. 



Only a single polian vesicle is present, attaining the length of about 4 to 5 mm. 

 From want of material for examination, I am somewhat undecided with regard to the 

 niadreporic canal, whether it communicates with the exterior or not. The alimentary 

 canal has no cloaca. The reproductive organ, consisting of a very small fascicle of 

 casca, attains a length of about 7 or 10 mm. ; its duct opens a little above the crown of 

 the tentacles where the brim projects. 



JUnypniastes, 1 n. gen. 



Body very depressed, with an extension of the body- wall round its anterior extremity, 

 constituting a very large, broad, rather flat brim. Tentacles twenty (?). The dorsal 

 surface with small projections round the margin of the brim and with some other very 

 small processes on its ambulacra. Pedicels along the sides (?) and round the posterior 

 extremity of the body. 



Enypniastes eximia, n. sp. (PI. VIII. figs. 6, 7). 



Body about twice as long as broad. Mouth ventral, behind the very broad brim. 

 Anus dorsal. The dorsal surface with numerous small processes round the margin of 

 the brim, and with some other very small ones, disposed in pairs on the ambulacra. 



Colour in alcohol, light grey. Tentacles and processes brown, inclining to violet. 

 Length, about 72 mm. Breadth, about 32 mm. 



Habitat.— Station 168. July 8, 1874. Lat. 40° 28' S., long. 177° 43' E. Depth, 

 1100 fathoms; bottom temperature, 2*0° C. ; grey ooze. Four very incomplete 

 specimens. 



The four specimens brought home are unfortunately so lacerated and in such a 

 state of maceration as to render any closer examination impossible. It is not possible 

 to form any correct idea of these very interesting forms, on account of which I have not 

 been able to give any complete drawings but only some simple outline figures, and I even 

 feel very considerable uncertainty as to the correctness of those. The dorsal surface is 

 slightly convex and the ventral one almost flat, the body thus becoming very depressed. 

 The animal attains its greatest breadth a little in front of the mouth. With regard to the 

 broad brim, formed anteriorly by the body-wall and pierced by a number of wide close- 



1 'Ewavixarns = dreamer. 



