OF ENGRAVINGS. 



FiR- Page 



30 Ditto of the Percafluviatilis, (Cams) 116 



31 Imbricated arrangement of the scales of fishes (Heisinger) 116 



32 Section of the bulbs of hair, magnified 117 



33 Quill of Porcupine, (F. Cuvier) 121 



34 Transverse section of the same, (id.) 121 



35 Longitudinal section of the root of ditto, (id.) 121 



36 Capsule of bulb of ditto laid open, (id) 121 



37 Muscle in a state of relaxation 129 



38 The same muscle contracted 129 



39 Diagram illustrating the action of oblique muscles 129 



40 Semi-penniform muscle 129 



41 Penniform muscle 129 



42 Complex muscle 129 



43 Tendon of muscle 129 



44 Trapezius muscle 129 



45 Muscular structure of the Ear-drum, (Home) 136 



46 Orbicular muscle of the Eye-lids, (Albinus) 136 



47 Muscular structure of the Iris, (Home) 136 



48 Muscular fibres of a sucking disk 136 



49 Longitudinal muscular fibres of a blood-vessel 137 



50 Transverse muscular fibres of ditto 1 37 



51 Muscular fibres of the human stomach, (Cooper) 137 



52 Muscular fibres of the Heart, (id.) 137 



53 Magnified view of a Sponge, (Grant) 149 



54 Spicula in the texture of a Sponge, (id.) 149 



55 Gemmule of a Sponge, (id.) 149 



56 Lobularia. Alcyonium pelasgica, (Deterville) 162 



57 Detached polype of ditto, (id.) 162 



58 Zoanthus, (Actinia sociata), (Ellis) 162 



59 Hydra viridis, (Trembley) 162 



60 Sertularia pelasgica, (Deterville) 165 



61 Tubipora musica, (Ellis) 165 



62 Section and polypes of ditto, magnified, (id.) 165 



63 Flustra carbasea, (id) 165 



64 Cells of ditto, magnified, (id.) 165 



65 Corallium rubrum, (id.) 166 



66 Polypes of ditto, magnified, (id.) 1 66 



67 Section of Gorgonia Briareus, (id.) 166 



