By C.A. A Edwards
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America from California to Guyana and Colombia, West Indies, tropical and southern Africa. Some species peregrine. ) Ilyogenia Beddard. South America, Southern India and Australia. Kerriona Michaelsen. Eastern Brazil. Liodrilus Eisen. Maheina Michaelsen. Seychelles. Malabaria Stephenson. South India (Aquatic or amphibious). N annodrilus Beddard. Western tropical Africa. Nematogenia Eisen. Southern Nigeria, Liberia, Costa Rica. One species peregrine in Bahamas, Panama, Ceylon.
Each segmental nerve has a small subsidiary branch, close to the nerve cord, which passes down into the circular muscle layer, and then between this and the longitudinal muscle layer, ending in branches to the epidermis just before it reaches the mid-ventral line. C;Anln~ntnl FIg. 14 nerves Nervous system of L. terrestris from above. (After Grove and Newell, 1962) by a pair of nerves (septal nerves) arising near the junction of the posterior segmental nerves and the ventral nerve cord (Fig. 14).
15 MORPHOLOGY Albumen cell Goblet cell Cullcle Blood vessel , \' ~ "\. \'" Fig. 4 Transverse section of a portion of the body wall. (After Grove and Newell, 1962) Large numbers of sensory cells, grouped together to form sense organs which respond to tactile stimuli, are scattered throughout the epidermis (Figs. 5 and 6). These are more numerous on the ventral than on the dorsal surface. Photoreceptor cells, capable of distinguishing differences in light intensity, occur in the basal part of the epidermis (Fig.