200 



LEECHES 



Light reaction, 83 

 Light sensitive cells, 79-81 

 Locomotion, 73-78, 94 

 Lophiiis piscatorius, 139 

 Lumbricus heradeus, 59 

 Lumbricus terrestris^ 45 



Macrobdella, 32, 140, 141 

 Macromere, 117-120, 122, 123, 



125, 127, 129, 130 

 Male pore, 6, 7, 25, 26, 30 

 Mesoblast, UO-132 

 Mesoderm, 119, 120, 123, 126, 



128, 130-133 

 Metamorphosis, 129, 130, 133 

 Micromere, 117-130 

 Mortality, 145, 146 

 Mosaic egg, 118 

 Mucus glands, 16, 18 

 Muscle, 19, 63-69 



circular, 17, 18, 63, 66, 111, 

 120, 124, 127, 133 



dorso-ventral, 18, 66 



longitudinal, 17,18,63,66,68, 

 126 



oblique, 63 



tonus, 69 



Nephelopsis, 141 



Nephridia, 9, 12, 26, 44, 46, 48, 



49, 51, 126 

 Nephridioblast, 13, 126 

 Nephridiopore, 7 

 Nerve cells, 69 



Nerve cord, see ventral nerve cord 

 Nerve fibres, 70, 72, 79, 80 

 Nerve ring, 72, 79 

 Nervous system, 9, 13, 14, 69-73 

 Neuroglia, 69 

 Nutrition, 36-43 



Oesophagus, 10, 21 



Optic cell, 19 



Optic nerve, 19 



Orcheobis herpobdellae, 141 



Ovary, 3, 11, 12, 24, 25, 30, 101, Pole plasm, 121 



108, 109 Pontobdella, 31, 140, 143 



Oviducal gland, 11 



Oviduct, ii, 12 



Oxygen consumption, 56, 57, 59, 



61 

 Oxygen (as ecological factor), 1 38, 



146 

 Ozobranchus, 31 



Parasites (leeches as), 141 

 Parasites (of leeches), 142, 143, 



144 

 Parental care, 113, 114 

 Pelobates, 97 

 Penis, 3, 11, 105 

 Penis sheath, 11 

 Phagocytosis, 48 

 Pharyngobdellae, 22, 34 

 Pharynx, 3, 8-10, 34, 129 

 Pheretima, 46 

 Philobdella, 140 

 Photoreceptor, 81 

 Phototaxis, 90 

 Pigment cell {see also chromato- 



phore), 18, 89 

 Piscicola 



appearance, 28 



behaviour, 84, 85, 88, 92, 93, 

 95, 98 



breeding, 108, 109 



chromatophores, 90 



chromosomes, 134 



digestion, 42 



ecology, 138 



embryology, 131, 132 



eye, 81,82 



food, 140 



locomotion, 74 



oxygen uptake, 56, 57 



parasites, 143 



pulsatile vesicles, 53, 54 

 Piscicolidae, 22, 29, 104, 108, 111, 



133, 134, 135 

 Placobdella, 29, 42, 52, 91, 92, 



105, 143 

 Polar body, 121 



