Leeches (Hirudinea) Their Structure, Physiology, Ecology and Embryology

abdomen acid animal annelids annuli annuli per segment Autrum Biol Blanchard blastomeres blood body wall botryoidal tissue Branchellion torpedinis Calliobdella nodulifera capsule cells chaetae chloragogenous ciliated circular muscles clitellum cocoon coelomic coelomic fluid colour copulatory Cottus scorpius crop Cystobranchus diverticula dorso-ventral duct earthworms ectoderm eggs endoderm epidermis Erpobdella octoculata Erpobdella testacea eyes flattened freshwater ganglia ganglion gastrulation genital pores germinal bands Glossiphonia complanata Gnathobdellae gnathobdellid gonopores Haemadipsidae Haemopis Helobdella stagnalis Hemiclepsis marginata Herter Hirudidae Hirudinea Hirudo medicinalis jaws larval leeches light Mann median mesoderm Meyer micromeres Moore muscular nephridia nephridium nervous system normal oligochaetes oral sucker organs oxygen oxygen concentration pairs parasites pharynx pigment Piscicola geometra Piscicolidae Platybdella polychaetes Pontobdella posterior sucker proboscis pulsatile vesicles Raia reaction rows scorpius segmental nerves Selensky sinus sinuses somite species spermatophore sperms Suckers discoid sucking Theromyzon tessulatum Trachelobdella lubrica trachelosome tubercles ventral nerve cord Verrill Zool