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 Excerpt: ...They open freely to the outside, no operculum being developed. The gills are attached their whole length to the interbranchial septum. Usually a spiracle OC-FlG-235-Relations of gill clefts in the elas, ... mobranchs. //, hyoid arch; m. mandible; s, curs, and this may bear spiracIe a pseudobranch (p. 23). The ...
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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 Excerpt: ...They open freely to the outside, no operculum being developed. The gills are attached their whole length to the interbranchial septum. Usually a spiracle OC-FlG-235-Relations of gill clefts in the elas, ... mobranchs. //, hyoid arch; m. mandible; s, curs, and this may bear spiracIe a pseudobranch (p. 23). The hemispheres of the brain are united, and the olfactory lobes are separated from the cerebrum by an elongate olfactory tract. The twixt brain is short, and an optic chiasma occurs. The lateral line system is well developed, and in the skates becomes greatly branched. On the head are numerous sensory ampullae filled with jelly. The skeleton is cartilaginous; but in many cases it is rendered more dense by the deposition of lime, which, however, never takes the shape of bone corpuscles, there being a sharp line between calcified cartilage and bone. Membrane bones are absent in all recent forms, but in some fossils the dermal scales united to form an extensive armor. In some the vertebral centra are entirely of cartilage. When lime is deposited in them it may take two shapes, either laid down in concentric Fig. 236. Diagrams of cyclospondylous (A) areas (cyclospondyandasterospondylous (.5) vertebra: . Calcifications lous tVPC") or in a raof cartilage black..'"" y' dial manner (astero spondylous). In the diplospondyli and in the tail of some skates an embolomerous condition occurs. In all recent forms the neural arch is converted into a closed canal by the insertion of intercalary pieces betweeen the neural processes and spine. The cranium is a solid box without sutures. In its roof there may be one or two gaps (fontanelles) closed by membrane. The pterygoquadrate is never firmly united to the cranium, but either articulates directly with it (am...
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Add this copy of Text Book of Vertebrate Zoology (Hardback Or Cased Book to cart. $43.17, new condition, Sold by BargainBookStores rated 3.0 out of 5 stars, ships from Grand Rapids, MI, UNITED STATES, published 2019 by Wentworth Press.
Add this copy of Text Book of Vertebrate Zoology: -1899 to cart. $51.23, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by Cornell University Library.
