Catalogue of the Chaetopoda in the British Museum Natural History
Catalogue of the Chaetopoda in the British Museum Natural History
James Hartley Ashworth
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Chorizobranchus marinus Quatrefages, Hist. Nat. Annel. , ii, p. 267. Caudate Arenicola with nineteen chaetiferous segments ; thirteen pairs of gills, the first, which is on the seventh segment, may be small or absent ; gills usually of the pinnate type, but occasionally bushy ; lateral lobes of the prostomium much larger than the median lobe, and generally folded in their anterior portion ; neuropodia 1 For comments on this record, see p. 144. I 2 116 Arenicolidae clearly visible in each segmen...t, those of the posterior branchial region are short and do not approach the rnid-ventral line ; the distal part of each crotchet has a form resembling that of a swan's head, that is, the region just proximal to the rostrum of the crotchet has , -N. GR. Fig. 48. A. Pusilla, from California. Anterior end, dorsal aspect ; show- ing the large and folded lateral lobes of the prostomium. "V^>. X6 Fig. 49. A. Pusilla, from Atka Island. Anterior aspect, showing the prostomium (PR. ), with its large lateral lobes, the nuchal groove (N.
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