Chalk Formation of Denmark. 63 



nishing. The following list is an enumeration of the genera 

 which have been found. No doubt their number will be greatly 

 increased when more attention shall be paid to them. 



A crab. (Brachiurites rugosus of Schlotheim.) This is 

 one of the most characteristic fossils of this limestone. It is 

 very frequent, and generally in a good state of preservation. 

 Among my specimens I have found one with much sharper 

 outlines, and without the numerous depressions of the shell, 

 which have given occasion for its trivial name. It is perhaps 

 a new species ; perhaps only a young specimen of the com- 

 mon crab of Taxoe. Teeth of fishes ; Crania, a species hav- 

 ing the form of a horse shoe ; three species of Ostrea ; one 

 species of Pecten ; one species of Mytilus; one species of 

 Area ; one species of Cardium ; four species of Terebratula ; 

 four species of indeterminable bivalves ; fragments of a Cu- 

 tillus ; one species of Nautilus, Nautilit. Danicus, Schlotheim ; 

 three species of Trochus or Solarium, one of which is the 

 Trochilites Niloticiformis of Schlotheim ; one species of Ceri- 

 thium ? two species of Fusus, of which one is rather doubt- 

 ful ; one species of Buccinum ? two species of Cypraea, the 

 one Cyprasacites spiratus, Schlotheim, the other Cyprceacites 

 bullatus, Schlotheim ; one species of Capulus ; one species of 

 Spatangus ; one species of Echinus or Cidaris ; fragments of a 

 Pentacrinites ; one species of Turbinolia ; one species of Fa- 

 vosites ; a number of other corals which have not yet met 

 with sufficient attention. The limestone of Taxoe has, toge- 

 ther with the Cerithium limestone of Stevensklint, the follow- 

 ing fossils :— The Trochus Niloticiformis of Schlotheim ; the 

 Turbinolia ; the Favosites. . 



The nature of the rock in these two places, at Taxoe and 

 in the middle of the cliff at Stevensklint, approaches, besides, 

 in many instances so closely to each other, that we are obliged 

 to consider these two kinds of limestone to be identical, al- 

 though the beds are extremely different in thickness. The 

 limestone at Taxoe is covered by a bed of grayish white marl, 

 containing broken pieces of limestone, and which undulates 

 like the surface of the hill. 



In the south part of Sealand no other solid rocks occur ; but 

 on the neighbouring island of Moen a chalk-like rock forms 

 on the east side cliffs, of a height amounting to 400 feet. 



