Abstract
RECENTLY, Raghbir Singh*, director of fisheries, Madras, sent me a specimen of Echeneis naucrates for study. Having suggested1,2 the presence of a pump at the hind end of the sucker, I dissected it under the binocular microscope and discovered two pairs of longitudinal pigmented canals one of which is broader and overlaps the basal plates on their ventral side towards their outer margins. The other is still further towards the outside, closely bordering the outer tips of the lamellar bars. Having no other specimens for study, I recently re-examined the two specimens sent to me by Dr. Mees, of the Western Australian Museum, Perth, and found that they had not been transferred to the preservative fluid after I had examined them last, so that they had become dried up. But on examining them now I noticed that grooves had formed on the disk in the position in which the outer pigmented canals are present internally.
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