Description of the Lepidosiren annectens / by Richard Owen.

  • Owen, Richard, Sir, 1804-1892.
Date:
[1839]
Catalogue details

Licence: Public Domain Mark

Credit: Description of the Lepidosiren annectens / by Richard Owen. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Tab. XXV. Fig-. ]. Abdominal cavity and pericardium of Lepidosiren annectens. a. Mylo-hyoideus. h. Sterno-hyoideus. c. Coraco-hyoideus. d. Fibrous membrane covering1 the pericardium e. f. Serous layer of the peritoneum reflected from the pericardiac septum, g. Right ova- rium. h. Liver, i. Gall-bladder, h. Intestine. /. Mediastinal fold of the serous layer of the peritoneum, m. A bristle passed through the peritoneal outlet, n. The same through the anal orifice, o. The same through the uro-genital outlet. (The common cloacal passage is removed with the skin.) 2. Digestive organs of Lepidosiren annectens. a. (Esophagus, h. Stomach, laid open. c. Pyloric valve, d. Spiral valve of intestine, e. Rectum, f. Liver, g. Gall-bladder, h. Val- vular termination of ductus choledochus. i. Vena cava hepatica. 3. Heart, gills, and lungs in situ, of Lepidosiren annectens. a. Auricle; the letter is placed on the right appendix, h. Ventricle. c. Bulbus arteriosus, d. The pericardium, e. The abdominal vena cava. f. The muscular stratum dissected off, to showg. the mucous membrane of the branchial chamber of the right side. Both are removed on the left side, to expose the gills and branchial arches: bristles are represented as passing from the mouth through the five interspaces of the branchial arches, h. The hyoid arch. i.i. The lungs: that on the right side is laid open to show its cel- lular structure, x. The left coracoid turned outwards, to show the heart: the right coracoid is in situ, with the pericardium at- tached to it. 4. Front view of the jaws and teeth of Lepidosiren annectens. 5. View of the upper or working surface of the dental plates of the lower jaw. All the figures in this plate are of the natural size. 3 B VOL. XVIII.