XXIV LIST OF ENGRAVINGS. 



Fig. Page 



68 Isis hippuris, (id.) 166 



69 Polype of Flustra carbasea, (Grant) 166 



70 Tentaculum of ditto, magnified, (id.) 166 



71 Pennatula phosphorea, (Ellis) 174 



72 Magnified view of the polypes of ditto, (id.) 174 



73 to 76 Mode of progression of the Hydra viridis,(Tremb\ey} 178 



77 Vorticella cyathina, (Muller) 183 



78 Proteus diffluens, (id.) 187 



79 Volvox globator, (id.) 187 



80 Brachionus urceolaris, (id.) . 1 89 



81 Medusa pulmo, (Macri) 192 



82 Beroe ovatus, (Bruguiere) 194 



83 Beroe pileus (id.) 194 



84 Velella limbosa, (Guerin) 194 



85 Physalia atlantica (id.) 194 



86 Actinia rufa, (original) 198 



87 Ditto expanded, (original) 198 



88 Asterias serrulata (Bruguiere) 199 



89 Asterias regularis, (id.) 199 



90 Echinus Ananchites ovata, (id.) 199 



91 Clypeaster rosaceus, (id.) 199 



92 Ophiura lacertosa, (id.) 1 99 



93 Euryale muricatum,- (id.) 199 



94 Pentacrinus europceus, (Thomson) 199 



95 Ambulacra, and feet of Asterias, viewed from the under 



side, (Reaumur) . ; . . 20 1 



96 Ditto, viewed from the upper side, (id) 201 



97 Vesicles appended to the feet of the Asterias 201 



98 Polygonal pieces composing the test of the Echinus . . 204 



99 Structure of a detached piece of ditto 204 



100 Spine of the Cidaris, (Cams) 204 



101 Shell of Unio batava, (Goldfuss) 217 



102 Adductor muscle of Oyster, (Hunter ian Museum) .. .. 218 



103 Shell of Pholas Candida, with abductor muscle, (Osier) 220 



104 Foot of Cardium edule, (Reaumur) 221 



105 Planorbus cornutus (Cuvier) 227 



106 Magnified view of the striee on the surface of Mother 



of Pearl, (Herschel) 232 



