MANUAL OF NATTJKAL HISTORY. 567 



Spirifer, Atryapa, Orthis, Terebratula, Lingula, 

 and Pentamerus, and the cephalopodous genera 

 Orthoceras, Lituites, and Phragmoceras. 



In the slate of Solenhofen a few impressions re- 

 sembling those of Medusae are the only traces yet 

 discovered of the evanescent, delicate, and fragile 

 Acalephce. One of the limestones of the middle 

 Oolite is named the " coral rag/' from the abundance 

 of corals it contains ; there is also a bed of coral- 

 line limestone upon the freestone of the lower Oolite 

 of the Cotteswold Hills. These remains of Zoo- 

 phytes consist chiefly of the genera of Explanaria; 

 star-like Astrece; fungus-shaped Agaricice; flower- 

 like Caryopliyllice ; cup-shaped Cyathophylla ; and 

 many other forms of the larger lithophytes now 

 confined to equatorial seas. 



Several genera of Sponges have been identified 

 in the Oolitic rocks, as the reticulate Achilleum ; 

 the turbinated Cnemidium and Siphonia ; and the 

 polypiferous genera Catenipora, Porites, Cystiphyl- 

 Iwm and Graptolithus have also been met with. 



Belonging to the World of Vegetables we find in 

 the Oolitic epoch the elegant Thick-fern or Pachyp- 

 teris, the Tongue-leaved Fern, Glossopteris, and the 

 Round-leaved Fern, Cyclopteris ; in the family Cy- 

 cadacece ; the winged leaves of Pterophyllum, and 

 a species of Zamia have been detected ; and among 

 the Pinacece, Peuce, Brachyphyllum, Taxites and 

 Thuytes; while in the lower Oolite of Yorkshire, a 

 colossal Horsetail, or Equisetum, has been dis- 

 covered. 



