PLATES IN VOL. XVIH. 



Plate L Polyzoa from the Coast of Norway. 



IL Devplopmcnt of Arenicola piscntorum. 



III. Anatomy of a Bitentaculate Slug from Aneiteum. 



IV. Anatomy of the genus Atlas. 



VI. > Organization of Freshwater Infusoria. 

 VII. J 



VIII. Metamorphosis of a Polype-like Animal. — New British species 

 of Skenea. 



IX. Edwardsia carnea. — Cardium exiguum. 



X. British Umbilicaria;. 



XI. British Ai'thoniac. 



XII.] 



XIII. \ New British Ilydroid Zoophytes. 



XIV. J 



XV. Young state of Ophiocoma rosula. 

 XVI. New British Zoophytes. 



ERRATA. 



Page 405, line 13 from bottom, /or Zirhut read Tirhut. 

 ,, 407, line 22, for eundum read eundem. 



„ „ line 11 from bottom, /or hot-water courses read hill water-courses. 

 „ 420, Une 20, /or ponds read gbauts. 



Vol. xvii. page 501, last line, /or June read May. 



