An Account of the Crustacea of Norway; With Short Descriptions and Figures of All the Species Volume . 2-3
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...to differ very markedly in certain points, and may thus undoubtedly be regarded as specifically distinct. The peculiar form of the side-plates of the 1st segment of the mesosome is an especially marked character, and the caudal segment also differs essentially in its form. Occurrence.--I have myself only met with this species in a single locality near Christiania, viz., close to the shore on the outermost point of the Ladegaardso, where it was found occasionally below stones together with Porcellio pictus. Mr. Ellingsen has, however, collected it in 3 different places, viz., at Kragero, Grimstad and Boro, and some few specimens in our Univ. Museum were also found among A. pictum, and were collected at Langesund by the late Dr. Jensen. In habits it exactly resembles A. pictum. Dstributioh.--Northern and Central Europe, in the same places as A. pictum. Tribe 6. EPICARIDA. The Isopoda belonging to this tribe are all parasitic forms, and their hosts are invariably other Crustacea of different orders; hence the above name of the tribe. They are the most degradated forms of Isopoda, and in some instances the fully-grown female represents merely a simple sac filled with ova, and without any trace of segmentation or of limbs, so that the idea of its being a crustacean animal would hardly suggest itself, if the development were not known. In all the forms a more or less pronounced regressive metamorphosis has been observed, comprising at least two distinct larval stages, very dissimilar both in their general appearance and in the structure of the several appendages, and equally different from the adult animal. As will be shown further below, there is in all probability in most of the forms even a 3rd intermediate larval stage, the Microniscus stage, ..
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