. Report on the scientific results of the voyage of H. M. S. Challenger during the years 1873-76 under the command of Captain George S. and the late Captain Frank Tourle Thomson, R. N. nervous , brain-lobes; , posterior brain-lobes (side organs) with their cavity opening to theexterior at ; , numerous cephalic nerves to the tip of the head, the eyes, &c.,only a few of them are here indicated in outline ; Prn, nerves for innervation of the pro-boscis (they are more numerous than is here indicated); Va, outline of vagus nerves]innging from the lower brain-lobes and
. Report on the scientific results of the voyage of H. M. S. Challenger during the years 1873-76 under the command of Captain George S. and the late Captain Frank Tourle Thomson, R. N. nervous , brain-lobes; , posterior brain-lobes (side organs) with their cavity opening to theexterior at ; , numerous cephalic nerves to the tip of the head, the eyes, &c.,only a few of them are here indicated in outline ; Prn, nerves for innervation of the pro-boscis (they are more numerous than is here indicated); Va, outline of vagus nerves]innging from the lower brain-lobes and running forwards towards the oesophagus. Thelatter passes beneath the brain-lobes and their double commissure, but above the laddercommissures (Comm), which metamerically unite the longitudinal nerve-stems {LN) belowthe intestine ; , peripheral nerves springing from these nerve-stems. Fig 11. Amphiporus moseleyi, n. sj). Stylet and accessory darts. .^ and /i,//, the central stylet andits two accessory sacs, in position; //, bases of two accessory darts, viewed laterally (figureto the left), and pevspectively (figure to the right). The Voyage of H M Nemertea PI IX-. HuDiecht et de Groot del K ilulli, Lift AMPHIPORUS. DREPANOPH0RUS PLATE X. X. Fig. 1. AmpMponis marioni, n. sp. Part of a transverse section tluough the oesophageal region, indi-cating the relative importance of the musculature with respect to the integument and thegelatinous tissue. Prg, proboscidian sheath in contracted state, the outline only partlyworked up to show the interlacement of muscular fibres, the basement layer and the internalepithelium; di\ dorsal blood-vessel surrounded by gelatinous tissue, as is the proboscidiansheath, and Oe, the oesophagus with its cellular epithelium. Outside of this there is a layerof darker fusiform bodies, which are most probably unicellular parasitic organisms. Gt, thegelatinous tissue ; a, the longitudinal, j3, the circular muscular coat; at
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