PLATYCRINID^. PLATYCRINITES. 27 



the cabinet of Mr. Wm. Morgan, by whose obliging kindness we were enabled to make 

 the sketch. 



The Proboscis, or Oral Tube. — The proboscis of this species is elongated in a some- 

 what less degree than in the typical species, but like that species it is central and 

 incapable of being AvithdraAvn into the intestinal cavity. It is covered to the vertex 

 with rather u-regularly shaped hexagonal plates, which completely conceal the oral 

 orifice, so that the mouth must have been valvate, and incapable of contraction, as was 

 probably the case ^vith all those species whose oral apparatus was not surrounded by 

 very minute plates. The proboscidial plates are smooth, and arranged spirally around 

 the organ. 



The Rays. — The number imkno\vii ; but from the smaUness of the excavations for 

 theii' attachment, they appear to have been delicate and few in number. 



The Column. — This portion of the elonc/atus is as yet unascertained ; but it was pro- 

 bably slender, as partly indicated by the smallness of the point of attachment in the 

 dorso-central plate, though this is not always a just criterion by which to estimate the 

 thickness of the column. 



Base of Attachment. — Unluiown. 



5. Species. Platycrinites antheliontes. (Austin.) 



Elym. ANGEAION, [anthetion) a flower. 



Definition. — Dorso-central plate pentagonal and somewhat saucer shaped ; perisomic 

 plates short and spreading ; plates covering the vertex irregvdarly hexagonal. Mouth 

 valvate and central ; basal ray joints five, number of bifiu'cations unknoAvn, but pro- 

 bably amounting to twenty. Column also unascertained. 



Synonymes and References. 



Platycrinites anthehontes. — Messrs. Austin. Ami. and May. Nat. Hist. Nos. 63 and 



69, pages 109 and 199. 



