. Bulletin of the Natural History Museum Zoology. J 2 LENGTH {mm) Fig. 6. Neilonella salicensis. Length/frequency histogram of a sample taken from Atlantis II station 73 from the North America Basin. marked size groups. It is unclear whether these latter relate to annual settlements or to fortuitous periodic settlements. Internal morphology (Figs 7 & 8) This was one of the few deep-sea species that were kept alive for a few weeks following the processing of the sample. The external drab olive/yellow of the shell is in marked contrast to the spectacularly vivid array of colours of the body
. Bulletin of the Natural History Museum Zoology. J 2 LENGTH {mm) Fig. 6. Neilonella salicensis. Length/frequency histogram of a sample taken from Atlantis II station 73 from the North America Basin. marked size groups. It is unclear whether these latter relate to annual settlements or to fortuitous periodic settlements. Internal morphology (Figs 7 & 8) This was one of the few deep-sea species that were kept alive for a few weeks following the processing of the sample. The external drab olive/yellow of the shell is in marked contrast to the spectacularly vivid array of colours of the body organs. The stomach is a bright emerald green, the digestive gland a bright olive green and the gills are bright red. The gill plates are particularly vivid below the frontal cilia and dorso-laterally, in addition the mantle overlying the gills is also red. The margins of the palps are a diffuse pink as too is a band underlying the crest of the inner folds. The red and pink pigments are probably a cytochrome. The blood is not red in colour and probably contains a haemocyanin as do other protobranchs (Taylor, Daven- port and Allen, 1995). Elsewhere the palps are pale yellow and the yellow/pink effect is in marked contrast to the palp proboscides which are pure white. Gl CV Fig. 7. Neilonella salicensis. Semidiagrammatic view of the internal morphology as seen from the right side. See abbreviations to text-figures on p. 102. Scale = 1mm. The mantle has three marginal folds of which the inner is fused at the posterior end to form the siphon. Fusion is minimal, restricted to the dorsal margin of the siphon (Fig. 8). Ventrally the siphonal margins are unfused as too are the longitudinal ridges that mark the division between the dorsal exhalent and ventral inhalent channels. The gill axes attach to the inner ends of the longitudinal ridges. There is a shallow siphonal embayment and attached to its inner limit on the left or the right side is a siphonal tentacle which in living s
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