283 Bulletin 5 13 



Say on Shells, &c. 35 



Fossil in different parts of the U. States, particularly at 

 the falls of the Ohio river and in Ulster County, New- York. 

 From this last localit}', Mr. G. W. Peale obtained some fine 

 specimens when digging for bones of the Mastodon. — Has 

 not yet occurred in the alluxdal deposit of New-Jersey. 



Each tube is divided into numerous cells by transverse 

 septae, precisely as in the Favosite. Mr. Parkinson, in his 

 Organic Remains 2, p. 21, remarks, that minute openings 

 are observable in the sides of the tubes ; these are not dis- 

 tinct in the specimen under examination, owing perhaps to 

 its being entirely silicified, though an equivocal appearance 

 justifies the belief of their having existed ; and if so, the 

 analogy is very strong with the Favosites. A species of 

 Tiubinolia is implanted in the specimen under examination. 



Pentacrinus caput — Medusce. 



Of this very remarkable and rare animal, a specimen oc- 

 curs in the collection of the Museum of South Carolina ; it 

 was brought from the Island of Gaudaloupe by Mr. L'Her- 

 menier. This is, I believe, the fourth recent specimen 

 known, of this family of extinct animals : of the two other 

 individuals one is in the French, and the others in British 

 collections. 



The well known fossil animal supposed to be of this fam- 

 ily, so common near Huntsville and in some parts of Ken- 

 tucky, and which has been figured and described by Par- 

 kinson, cannot be properly arranged under either of the 

 genera. These vary in form and size. I have seen four 

 very distinct varieties, but it is possible they may have be- 

 longed to different parts of the same pedicel. 



Although this fossil is familiar to the observation of Natur- 

 alists, yet it does not appear that any particular name has 

 been appropriated to it, or that it has been assigned to any 

 definitive place in the systems. 



From its peculiar appearance, persons who have not de- 

 voted their attention, to the affinities of natural objects, have 

 regarded it as a petrified niU or Althea bud, and from the 

 ambiguity of its characters, or the obliteration of its sculp- 

 ture, naturalists have hesitated to indicate its family, or kin- 

 dred generic group. 



Parkinson is the first author who has figured and descri- 

 bed this animal remain. He refers it to the genus Encri- 



[A. J. S., ist Ser., Vol. II.] 



