CElKOinS BELONGINa TO TITE AnOCHINID.t:; 



51 



membranous, with scattered calcare- 

 ous granules. The mouth is sub- 

 central ; there are no regular oral 

 plates; but there seems to be a de- 

 termination of calcareous matter to 

 five interradial points round the mouth, 

 where it forms little irregular calcare- 

 ous bosses. There is an oral ring of long 

 fringed tentacles ; and the tentacles are 

 long and well marked along the radial 

 canals. The excretory openiug is on a 

 Jow interradial papilla. The ovaries are 

 borne upon the six or eight proximal 

 pinnules on each arm ; they are short 

 and rounded, resembling much in form 

 those of Antedon rosaceus. Satliycri- 

 nus appears to possess an assemblage 

 of characters in some respects inter- 

 mediate between Rliizocrinus and the 

 pentacrinoid stage of Antedon. I 

 reserve a full discussion of its syste- 

 matic position until I have an oppor- 

 tunity of describing it more in detail. 

 It seems to be widely distributed ; we 

 have detected fragments of it at at 

 least six or seven stations in the 

 Atlantic and the Southern Sea. 



Hyocrinus hetliellianus (fig. 2) has 

 much the appearance, and in some pro- 

 minent particulars it seems to have 

 very much the structure, of the palaeo- 

 zoic genus Platycrinus, or its subgenus 

 Dichocrinus. 



The longest portion of the stem 

 which we dredged was about 170 mil- 

 lims. in length ; but the basal part was 

 wanting, and we have no means of 

 ascertaining what may have been its 

 means of attachment. The stem is 

 much more rigid than that of Bathy- 

 crinus, and is made up of cylindrical 



Fi 



Hyocrinm hethellianus, 

 Wy.T. 



About Iwiee the natural size. 



