. Cuvier's animal kingdom : arranged according to its organization. Animals. BRANCHIOPODA. 439. ately beneath, are shorter than the body, setaceous, and 8 or 9-jointed; the terminal joints short, and pencilled with long- hairs, form a kind of oar. The mouth is composed of a ridged labium ; two large dentate and palpi- gerous mandibles, the basal joint of the palpi being furnished with a 5-branched branchia ; two pairs of maxillae, the anterior pair also bearing branchial appendages, and the posterior palpigerous. The office of the lower lip is performed by a compressed sternum. The legs are 5-
. Cuvier's animal kingdom : arranged according to its organization. Animals. BRANCHIOPODA. 439. ately beneath, are shorter than the body, setaceous, and 8 or 9-jointed; the terminal joints short, and pencilled with long- hairs, form a kind of oar. The mouth is composed of a ridged labium ; two large dentate and palpi- gerous mandibles, the basal joint of the palpi being furnished with a 5-branched branchia ; two pairs of maxillae, the anterior pair also bearing branchial appendages, and the posterior palpigerous. The office of the lower lip is performed by a compressed sternum. The legs are 5-jointed ; the two anterior much larger than the others ; affixed beneath the antenna;, and directed forwards. The two following legs are directed backwards, and are situated in the middle of the under-side of the body ; but the posterior pair never appear out of the shell, but are bent upwards to give support to the ovaries. The body presents no distinct articulation, and is terminated behind in a tail folded beneath the breast, with two setaceous or conical fila- ments. The eggs are spherical. The laying of the eggs and the casting of the skins of these Crustacea are not less numerous than those of Cyclops and other Entoniostraca, and their mode of life is similar. No recent author has been able to detect their sexual organs. Strauss, indeed, discovered the insertion of a great conical vessel, which he considered to be a testicle ; but the individuals which he examined were furnished with ovaries, whence it would seem that the Ci/prides are hermaphrodites. He, however, observed, in disproof of this opinion, that tlie males may probably exist at a certain period of the year, and that the vessel he describes may belong to the digestive system. According to Jurine, the antennœ are real fins or paddles, the animals having the power of extending the threads at will, and according to the rapidity with which they are anxious to swim. We also are of opinion that these filaments may m
Size: 1482px × 1686px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookpublishe, booksubjectanimals
