Quarterly journal of microscopical science . mmissure,may be called the infra-oesophageal ganglia. A second, moredelicate, nerve-ring round the pharynx has been demonstratedwith certainty in Chiton (8, 20), Neomenia {i::), Proneomenia (7),and Ch(Btoderma (4, 6) ; it may be termed the sublingual nerve-ring, and carries a ganglionic swelling—the sublingual gan-glion. The transverse ventral (pedal) commissures are placed atregular intervals, and in Neomenia (4) and Proneomenia (7)have been shown to take their course partly through the ventrallongitudinal blood-sinus. In the latter genus smaller r
Quarterly journal of microscopical science . mmissure,may be called the infra-oesophageal ganglia. A second, moredelicate, nerve-ring round the pharynx has been demonstratedwith certainty in Chiton (8, 20), Neomenia {i::), Proneomenia (7),and Ch(Btoderma (4, 6) ; it may be termed the sublingual nerve-ring, and carries a ganglionic swelling—the sublingual gan-glion. The transverse ventral (pedal) commissures are placed atregular intervals, and in Neomenia (4) and Proneomenia (7)have been shown to take their course partly through the ventrallongitudinal blood-sinus. In the latter genus smaller ramificationshave been seen to take their origin from these commissures. InChiton similar ramifications from the ventral commissures appearto give rise to a plexus-like arrangement of nerve-tissue in thefoot (5). In Chatoderma similar transverse ventral commissures betweenthe longitudinal stems, although specially looked for, have not asyet been found, and may with a certain amount of probability, 216 DR. A. A. W. I. FS&
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