A history of the British sessile-eyed Crustacea . d at the extremity,which is furnished with a pair of biramose biarticulatedfiliform appendages, slightly hairy at the extremity ofthe joints. The first specimen of this species that we obtainedwe dredged in Plymouth Sound. It was very small, andpossessed but six segments to the pereion, and conse-quently wanted one pair of legs. We therefore as-sumed it to have been that of a very young have since, from our valued correspondent , of Banff, obtained two others of larger size,and with the normal complement of limbs, all the oth
A history of the British sessile-eyed Crustacea . d at the extremity,which is furnished with a pair of biramose biarticulatedfiliform appendages, slightly hairy at the extremity ofthe joints. The first specimen of this species that we obtainedwe dredged in Plymouth Sound. It was very small, andpossessed but six segments to the pereion, and conse-quently wanted one pair of legs. We therefore as-sumed it to have been that of a very young have since, from our valued correspondent , of Banff, obtained two others of larger size,and with the normal complement of limbs, all the otherfeatures being persistent, a circumstance that induces usto believe that our description represents the character ofan adult animal. We are compelled to adopt this conclusion, from itsdifference from Tanais, its nearest ally, both in the formof the second pair of gnathopoda, the number ofplcopoda developed as swimming appendages, and thebiramose condition of the posterior pair of pleopoda. PARATANATS RIGIDUS. JSOPODA. ABERRANTIA. 141 PARATANATS RIGIDUS. Spedfic character.—Body narrow. Margins of the pereion and pleonparallel, pleon terminating in a central point. Antennae not longer than thecephalon. Posterior j)leopoda having both rami uniarticulate, the outerbeing half tlic length of the inner. Length ^th of an inch. The form of this species is slender and cylindrical,the sides running parallel with each other from the outerangle of the anterior margin of the head almost to theposterior pair of pleopoda. The cephalon is confluentwith the first segment of the pereion, and both togetherform a segment that is scarcely longer than broad. Thesecond segment of the pereion is very short; the third isabout three times as long as the second, and both togetherabout as long as the cephalon; the fourth segment isquadrate, and as long as the two preceding; the fifth is a > y-u cv^>—<»-*-*-^ft- ^
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Keywords: ., bookauthor, bookcentury1800, bookdecade1860, booksubjectcrustacea
