New Order of Gigantic Fossils. 



19 



noting the reversed whorls. The imaginary axis about which 

 the spiral is wound, is a cylinder three to four inches in 

 diameter, while that of the similar form, Carinata, is an in- 

 verted cone with a base two to three 

 inches in diameter. 



Probably the finest and most showy 

 specimen of all. as yet found, and possi- 

 bly one of the best that ever can be 

 found, was secured on the Morrill expe- 

 dition by Mr. Frederick C. Kenyon. It 

 consists of a pair of fossil corkscrews 

 opposed to one another, yet growing side 

 by side in such close proximity as to have 

 completely coalesced along the line of |, "^1- 



contact. 



The corkscrews of this exceptional pair 

 are large and tall : the one, a nearly per- 

 fect specimen, being so regular and sym- 

 metrical ; the other ragged and faulty, 

 yet bidding fair to be of the greater inter- 

 est on this very account, when the matrix 

 is properly cleaned from the specimen, fig. 15.— Daimoneiix an- 

 In blasting away a troublesome portion axiiis partly worked out. 



t-> J J^^ Location in quarry is 



of the bluff, one of the pair was slightly shown in Fig. 3, d. 

 injured before it was discovered that 

 there were two instead of the one we were quarrying out. 

 The more nearly perfect of the two has thirteen whorls, and, 

 as can be seen, expands noticeably from bottom to top, con- 

 trary to others which appear to taper upwards or else main- 

 tain a uniformity throughout. (See Fig. 16.) 



This specimen should probably be referred to this species. 



•^A 



Daiuionclix robiista, gen. et sp. nov. 



This species — and from all observations it seems a dis- 

 tinct species — differs from the foregoing in its marked 

 roughness, greater size, close coils, and powerfully thickened 



319 



