LIST OF ENGRAVINGS. XXIU 



Fig. Page 



67 Section of Gorgonia Briareus, (id.) 150 



68 Isis hippuris, (id.) 1 50 



69 Polype of Flustra carbasea, (Grant) 155 



70 Tentaculum of ditto, magnified, (id.) 155 



71 Penyiatala phosphnrea, (Ellis) 157 



72 Magnified view of the polypes of ditto, (id) 157 



73 to 76 Mode of progression of tlie Hydra viridis, (Trembley) 160 



77 Vorticella cyalhina, (MuUer) 165 



78 Amceba diffiuens, (id.) 170 



79 Volvox glnbator, (id.) 170 



80 Brachionus urceolaris, (id.) 172 



8 1 Medusa pulmo, (Macri) 175 



82 Beroe ovatus, (Bruguiere) 177 



83 Beroe pileus, (id.) 177 



84 Velella limbosa, (Guerin) 177 



85 Physalia atlantica, (id.) 177 



86 Actinia rufa, (original) 180 



87 Ditto expanded, (original) 180 



88 Asterias serrulata, (Bruguiere) 182 



89 Asterias regularis, (id.) 1 82 



90 Echinus Ananchites ovata, (id.) 182 



91 Clypeaster rosaceus, (id.) 182 



92 Ophiura lacertosa, (id.) 1 82 



93 Euryale muricatum, (id.) 182 



94 Pentacrinus eurojxBus, (Thomson) 182 



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



(Reaumur) 183 



96 Ditto, viewed from the upper side, (id.) 183 



97 Vesicles appended to the feet of the Asterias 183 



98 Polygonal pieces composing the test of the Ecldnus 185 



99 Structure of a detached piece of ditto 185 



100 Spine of the Cidaris, (Cams) 185 



101 Shell of Unio batava, (Goldfuss) 195 



102 Adductor muscle of Oyster, (Hunterian Museum) 196 



103 Shell of Pholas Candida, with abductor muscle, (Osier). . 198 



104 Foot of Cardium edule, (Reaumur) 199 



105 Planorbus cornutxis, (Cuvier) 204 



106 Magnified view of the striae on the surface of Mother of 



Pearl, (Herschel) 208 



107 Directions of the fibres in the component strata of shells . 210 



