Abstract
SPENGEL, in his admirable paper “Die Geruchsorgane und das Nervensystem der Mollusken” (Zeitschrift f. wiss. Zool. xxxv.), figures a transverse section of one of the rudimentary gills and its surroundings. This appears to be incorrect in one or two particulars. In the first place the gill is figured as projecting freely at the surface. The examination of numerous sections has, however, convinced me that the epithelium is continued over the gill, being very high where continuous with the olfactory epithelium over the ganglion, but gradually getting lower, and passing into the ordinary epithelium, which lines the nuchal chamber. Consequently the rudimentary gill is beneath the surface, and moreover the sensory tract is partly extended over it, not being confined to the region immediately superjacent to the olfactory ganglion. Cunningham (Q.F.M.S., xxii.), calls attention to the true relations of the gill, but gives no figure.
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DAVIS, J. Note on the Rudimentary Gills, Etc., of the Common Limpet (Patella Vulgata) . Nature 34, 185 (1886). https://doi.org/10.1038/034185a0
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DOI: https://doi.org/10.1038/034185a0