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.
1854 Excerpt: ...repeat that these venous canah are only lacunae
excavated in the muscular walls of the body, and are without proper
wall., as Meckel (Syst. d. vergleich. Anut. V. p. 12S) ha pretended
is the case with those of Aplyxia. ToK; convinced of their
wall-less structure it is only nee Riiry to examine microscopically
a longitudhialtr incised Arion. They will be found composed wh-ily
of muscular fibres interlaced in every direction, and some of which
surround, sphincter-like, the venom orifices, thus showing that
these last arc not closed by valves, but by the contraction of
these fibres. Souleyet himself could not deny this wall-less
structure in the veins or the Gasterop.xia, although it i in
contradiction with his statements against Phfebentemmus. He
declares (G#mpt. Rend. XX. p. 81, note 3) u que le syflteme vcineux
des Mollusques n'est pas toujours forme par des vaisseux distinct,
mais qu'il, se comitosc en grande partie de ces canaux excuses dans
Ptpnisseur oo dans l'interstice des organes." See also below 216,
note 1. i Kespiratry organs appear to be wholly absent in Saitta,
and Phyllirrhot. /. Branchiae. 220. With nearly all the
Cephalophora, excepting the Pulmonata, there is a Branchial
apparatus; this is usually very contractile, and always covered
with very lively cilia.(1) It is composed either of lamellae, or of
filaments arranged in rows or in bundles, or of plumose or
pectinate ramified prolongations. With some, the branchiae are
situated, uncovered, on the back or on the sides of the body; with
others, they are more or less covered by the mantle; but with the
majority, they are contained in a special cavity of this last. This
Branchial cavity communicates externally by the Siphon, which is
simply a canaliculated, contractile prolong...
|Country of origin:
Carl Theodore Ernst Siebold
||246 x 189 x 16mm (L x W x T)
||Paperback - Trade
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