92 



THE ATLANTIC. 



[chap. II. 



striking resemblance to Platycrinus is to a great degree super- 

 ficial. 



There seems to be little doubt that Rhizocrinus finds its 

 nearest known ally in the chalk Bourguetticrinus, and that it 

 must be referred to the Apiocrinidse. Were it not that there is 





/ 



Fig. 27 The Arrangement of the Soft Parts in Hyocrimis BethelUanus. a, oral valves; b, 



oral vasciihu- ring ; c, oral tentacles ; d, e, inner aspect of the esophagus and stomach ; /, 

 intestine; g, loose areolated connective tissue. Eight times the natural size. 



an evident relation between the two new genera and Rhizocri- 

 mis, in Poteriocrlnus and Hyocrinus the characters of the Api- 

 ocrinidae are so obscure that one would certainly not have been 

 inclined to associate them with that group. They are both 

 comparatively small forms, and although they do not show the 

 peculiar tendency to irregularity in the number of their princi- 

 pal parts which we find in Rkizocrinus, they have still small 

 calyces and large stems — a comparatively excessive develop- 

 ment of the vegetative parts. 



On the 27th of Auo-ust we sounded in the mornino- in 1900 

 fathoms, the bottom of little else than the shells of Globigerina. 



