. Bulletin of the British Museum (Natural History). 398 THE DISTRIBUTION OF PELAGIC POLYCHAETES carries two pairs of stout anterior antennae and a single small, unpaired, antenna between the large eyes. The five pairs of tentacular cirri are arranged on three successive segments behind the head thus i + i/i + i/i ^ of these the anterior is short and fat; the two dorsal are strap-like, equal in length and the longest of all; the anterior ventral very short and fat; the posterior ventral broadly Fig. II. Rhynchonereila mobii : parapodium from the fifth chaetiger of specimen from Stn
. Bulletin of the British Museum (Natural History). 398 THE DISTRIBUTION OF PELAGIC POLYCHAETES carries two pairs of stout anterior antennae and a single small, unpaired, antenna between the large eyes. The five pairs of tentacular cirri are arranged on three successive segments behind the head thus i + i/i + i/i ^ of these the anterior is short and fat; the two dorsal are strap-like, equal in length and the longest of all; the anterior ventral very short and fat; the posterior ventral broadly Fig. II. Rhynchonereila mobii : parapodium from the fifth chaetiger of specimen from Stn. 85B of the Trans-Pacific Exp., with acicular chaeta enlarged. Pigmented segmental glands appear on every foot from the seventh on the few specimens in which they are visible. Anterior parapodia have three to six simple acicular chaetae only ; from the tenth to the twelfth foot compound capUlary chaetae appear and acicular chaetae are gradually reduced until there is only one in each foot. The distal ends of the acicular chaetae are slightly serrated ; this serration is visible only at high magnifications. Dorsal and ventral cirri are broadly foliaceous, the former being the larger. There is a very prominent pedal lobe on all parapodia. General distribution. R. mobii is known only from Tropical and Sub-Tropical waters (see below, pp. 446-449). Rhynchonereila petersii (Langerhans), 1880* (Text-fig. I2«, b, c) Type locality. Madeira. Alciopa (Halodora) Petersii Langerhans, 1880, p. 312, pi. XVII,fig. 49. Callizona setosa : Fauvel, 1923, p. 214, fig. 80c, f. Rhynchonereila petersii: Stop-Bowitz, 1948, p. 34. Callizona setosa: Uschakov, 1957a, p. 281, chart 2, fig. be-i. * See Addenda, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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