PLATES IN VOL. XVIIL 



Plate L Polyzoa from the Coast of Norway. 



IL Development of Arenicola piseatomm. 

 in. Anatomy of a Bitentaculate Slug from Aneiteiim. 

 IV. Anatomy of the genus Atlas. 



VI. y Organization of Freshwater Infusoria. 

 VILJ 



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

 of Skenea. 



IX. Edwardsia carnea. — Cardium exiguum. 



X. British Umbilicarise. 



XI. British Arthoniae. 



XIL] 



XIII. > New British Hydroid Zoophytes. 



XIV. J 



■ XV. Young state of Ophiocoma rosula. 

 XVI. New British Zoophytes. 



ERRATA. 



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

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



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

 ,, 420, line 20, for ponds read ghauts. 



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



