By C.A. A Edwards
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Foetida smells of garlic, hence the name of this species. The consistency of the coelomic fluid differs between different species of earthworms, and also depends upon the humidity of the air in which the worms live; thus, it is thicker and more gelatinous in worms in dry situations than in those from wetter habitats. The coelomic fluid contains many different kinds of particles in suspension. The inorganic inclusions are mainly crystals of calcium carbonate, but the corpuscular bodies in the coelomic fluid of lumbricid worms include phagocytic amoebocytes, feeding on waste 'llaterials; vacuolar lymphocytes (small disk-shaped bodies which do MORPHOLOGY 19 not occur in worms with large numbers of eleocytes) and mucocytes (lenticular bodies which give the coelomic fluid a mucilaginous component).
Terrestris. (Original) longitudinal vessels, the contractile dorsal vessel, is closely associated witli the gut for most of its length, except in the most anterior portion, where it is separated from the gut by a mesentery. Some species of Megascolecidae and Glossoscolecidae have paired 22 BIOLOGY OF EARTHWORMS dorsal vessels for part or all of the length of the body. The ventral vessel, which is narrower than the dorsal vessel, lies immediately below the gut, and is suspended from it by a mesentery.
The families that fall into this category are: • ( 1) Moniligastridae. (2) Megascolecidae (Ocnerodrilidae, Acanthodrilidae, Octochaetidae). (3) Eudrilidae. ( 4) Glossoscolecidae (Hormogastridae, Criodrilidae). ( 5) Lumbricidae. Of these families, the two most important are the megascolecid group and the Lumbricidae. The megascolecid group comprises more than half the known species, and includes worms that are very • The families in brackets are those which Gates (1959) raised from Stephenson's original subfamilies, see page 43.