INDEX. 



829 



Nicobar Islands, 743, 745 

 Nidamental gland, 753, 755, 756, 



780, 805, 807, 809 

 Nuchal membrane, 740, 751, 752, 



763, 765, 767, 781 



Octopoda, 769, 807 



Octopus, 740, 766, 790, 798, 801 



Oesophagus, 781 



Oken, L., 737 



Olfactory nerve, 775 



Oliva, 795, 799 



Ophthalmic tentacles, 767, 773, 



793, 794 

 Optic ganglion, 764, 765 

 Oral sheath, 767, 776 

 d'Orbigny, C, 742, 743 

 Organ of Owen, 778, 779 

 Organ of Valenciennes, 771, 779, 



787, 809 

 Organ of Van der Hoeven, 776, 



778, 779 

 Orientation, 798, 806 

 Oro-anal axis, 797, 805 

 Osphradia, 753, 756, 790, 804 

 Ostium ahdominale, 787 

 Ostracum, 750 

 Otocones, 794 

 Otocyst, 744, 764, 765, 772, 781 



794 

 Ovary, 755, 786 

 Oviduct, 787 

 Owen, E., 736. 737, 738, 746, 751, 



752, 754, 755, 758, 764, 767, 768, 



771, 774, 779, 780, 784, 793, 799, 



800, 809 



Pallial arteries, 754, 762, 784 

 Pallial complex, 753 

 Pallial derivatives, 796 

 Palhal veins, 747, 759, 763 

 Pallio-nuchal artery, 763, 782 

 Pallio-septal arteries, 757 

 Pallio-siphonal sinus, 760 

 Pallio-viseeral flexure of Nautilus, 



806 

 Pallio-viseeral ligament, 751, 757, 



784 

 Pallio-viseeral region, 804 

 Pallio-viseeral torsion of Haliotis, 



806 

 Paper Nautilus, 808 

 Papillae vallatae, 739 

 Parapodia and Pteropodia, 795 

 Pearl formation, 746 

 Pedal derivatives, 796 

 Pedal ganglion and commissure, 



781 (see also Coronal ganglion) 

 Pedal gland, 766, 803 



Pedal Theory, 801 

 Pelecypoda (see Acephala) 

 Pelseneer, P., 760, 775, 791, 794, 



795, 796, 801, 803 

 Penis, 754, 787 

 Pericardial glands (or follicles), 790, 



804 

 Pericardial ligament, 805 

 Pericardium, 781, 790, 805 

 Perichondrium, 764 

 Perineurium, 764 

 Periostracum, 750 

 Periotic membrane, 764 

 Peripheral ganglion cells, 768, 793 

 Peristomial haemocoel, 765, 766, 



780, 783 

 Perivisceral coelom, 757, 760, 780, 



805 

 Pigment, 739, 752, 768 

 Pigmentation, 738, 790, 804 

 Plate, H. L., 792 

 Platjpodium, 796, 798, 799, 803 

 Pleural derivatives, 796 

 Pleural folds, 796 

 Pleuro-pedal system, 804 

 Pleurotomaria, 753, 788, 789, 794, 



804 

 Post-anal papilla, 791 

 Prepuce, 777 

 Preputial gland, 777 

 Propagation, 746, 747, 809 

 Propodium, 795, 803 

 Prosobranchiata, 753, 796, 804, 



806, 807 

 Protoconch, 748 



Protopodium, 795, 801, 803, 806 

 Proveutrioular artery, 782 

 Pteropodial lobes, 801, 803 (see also 



Parapodia) 

 Pyrifonn gland, 754, 780, 804 



Receptaculiim leminis, 780 



Rectum, 780 



RecuiTent arteries, 783, 797 



Recurrent nerve, 775, 797 



Reeve, L., 809 



Regeneration, 810 



Renal organs, 753, 788, 790, 804 



Renal orifices, 753, 754, 804, 807 



Reno-branchial vessels (same as 



Afferent branchial vessels), 780, 



788, 790, 804 

 Respiration, 790 

 Rete mirabile, 786 

 Retractor muscles, 765, 766, 781 

 Khinophore, 765, 779, 781, 791, 794 

 Rumphius, G. E., 737, 739 



Salivary glands, 781 



Scaphopoda, 806 

 Sepia, 740, 766, 788, 789 

 Septa of shell, 746, 748 

 Septal area (of mantle), 750 

 Septal contour, 749 

 Septal membrane, 749 

 Septal suture, 749, 751 

 Sequence of nerves and tentacles, 



772 

 Sexual dimorphism, 740 

 Sexual maturity, 748 

 Shell, 747, 751, 799, 809 

 Shell-gi-owth, 748 

 Shell-lines, 749 

 Shell-muscles, 738, 750 

 Simroth, H., 806 

 Sinug venosus', 780, 788 

 Siphon, 766 



Siphonal cartilages, 766 

 Siphonopodium, 764, 796, 799, 801 

 Siphuncle, 739, 746, 747, 754, 757, 



759, 766, 797, 798 

 Siphuncular artery, 758 

 Siphuncular vein, 759, 763 

 Situs im-ersus, 802, 810 

 Sowerby, G. B., 743, 808 

 Spadix, 741, 776, 777, 783, 810 

 Spengel, J. W., 792 

 Sperm atophore, 780, 787, 809 

 Spiruhi, 760, 799, 807 

 Statistics, 740 

 Stomach, 755, 784 

 Stomatogastric nerves, 774, 783 

 S trombus, 794 

 Substitution, 766, 796 

 Suckers of Cephalopoda, 769, 801 

 Suctorial ridges, 768, 800 

 SjTiipathetic nervous system, 774 

 Symphysial tracts, 771, 779, 803 

 Syncerebrum, 772 

 Systemic aorta, 763, 781, 784, 805 



Teleostean fishes (position of vent), 



797 

 Tentacles, 800 (see also Digital 



tentacles) 

 Tentacular arteries, 783 

 Tentacular crown, 767 

 Tessellate tentacle (of spadix), 777 

 Tetrabranchiata, 764, 807 

 Thiele, J., 750 

 Topography, 753, 783, 792, 793, 



796, 799, 803 

 Trochus, 792 

 Truncus arteriosus, 781 



Umbilicus of shell, 743, 748. 809 



Valenciennes, A., 736, 748, 750, 



