NARRATIVE OF THE CRUISE. 



309 



movable triangular plates, between which and the edge of the cup is an irregular 

 pavement of smaller plates. Four of these large oral plates are seen erect in fig. 122b, 

 protecting the delicate tentacles round the mouth, which leads into a funnel-shaped 



gullet; and the intestine terminates in a short 

 plated tube near the margin of one of the 

 interradial spaces on the disk (fig. 122c). 

 ILjocrinus has little in common with any 

 other recent Crinoid, and is not known to occur 

 in the fossil state. Only one entire specimen 

 was obtained at Station 147, together with a 

 few fragments, though portions of a stem were 

 dredged from a depth of 1850 fathoms in Mid 

 Atlantic, hit. 1° 47' N. (Station 106), together 

 with Baihycrinus campbellianus. 



" The Feather-stars, or Comatulce, as they 

 were termed by Lamarck, differ from the so- 

 called ' Stalked Crinoids ' in being unprovided 

 with a stem in the adult condition, although 

 they possess one when young. But at a certain 

 period of development, which varies consider- 



FlO. I'll.- Hyocrinus bet/iellianus, Wyv. Thorns. 



ably in different species, the cup containing the visceral mass detaches itself from the 

 stem, retaining, however, the top joint or centro-dorsal which closes the cup below. 



Before its severance from the remainder of the stem it becomes larger than the other 



