A history of the British sessile-eyed Crustacea . hat the Bopyrus may crawl again into the branchialcavity. I shall send you a Porcellana, the integumentsof which are so soft that it must have moulted veryrecently, and notwithstanding it has a very large Bopyrusin its branchial cavity. Moreover, it seems to be im-possible that the considerable deformation of the carapaceof the crab produced by the Bopyrus could disappear byexuviation; but I never found a deformed carapace with-out the Bopyrus, although I have examined, more than ahundred Porcellanae bearing the parasite.— I may hereobserve, in
A history of the British sessile-eyed Crustacea . hat the Bopyrus may crawl again into the branchialcavity. I shall send you a Porcellana, the integumentsof which are so soft that it must have moulted veryrecently, and notwithstanding it has a very large Bopyrusin its branchial cavity. Moreover, it seems to be im-possible that the considerable deformation of the carapaceof the crab produced by the Bopyrus could disappear byexuviation; but I never found a deformed carapace with-out the Bopyrus, although I have examined, more than ahundred Porcellanae bearing the parasite.— I may hereobserve, in Bopyrus Porcellance the right side is moredeveloped than the left when the parasite dwells in theright branchial cavity, whereas the left side is the largerwhen the Bopyrus dwells in the left branchial Bopyrus being fixed with its head directed backwardsnaturally in the right branchial cavity, the right side ofthe parasite can freely extend downwards, and thereforebecomes larger. I PHRYXUS HYNDMANNT. •^SRYX^ HYNDMANNl. Female. Flattened above, ovate in outline, but slightly equally developed on both sides of the pereion. Pleon havingsix segments, the segments being but little narrower than the hindersegments of the pereion, each furnished at each side with a flattened,rounded-oval scale or lobe, the two attached to the posterior segment beingrather more pointed; on the underside are two rows of elongate, conical,fleshy lobes, obtuse at their tips, and slightly wrinkled transversely. Length, about one-third of an inch. We are only acquainted with a single female individualof this species, found attached to a Pagurus obtained atGroomsport, Ireland, from ten fathoms depth, by C. Hyndman, on the 24th of May, 1851, and by himpresented to the late Mr. W. Thompson, in whose col-lection it is still preserved. From Phryxus Paguri it isat once distinguished by the rounded flat scales at thesides of the segmen
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Keywords: ., bookauthor, bookcentury1800, bookdecade1860, booksubjectcrustacea
