Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . e the termination of the rectum,to the left of this the orifice of the oviduct, and on each side at theroots of the anterior branchiae there is a small mamillary eminencewith a transverse slit, which conducts from the branchial cavity toone of the compartments of the pericardium containing two clustersof venous glands. There are also two similar, but smaller, slits con-tiguous to one another, near the root of the posterior branchia on 588 LECTURE XXIII. each side, which
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . e the termination of the rectum,to the left of this the orifice of the oviduct, and on each side at theroots of the anterior branchiae there is a small mamillary eminencewith a transverse slit, which conducts from the branchial cavity toone of the compartments of the pericardium containing two clustersof venous glands. There are also two similar, but smaller, slits con-tiguous to one another, near the root of the posterior branchia on 588 LECTURE XXIII. each side, which lead to, and may admit sea-water into, the compart-ments containing the posterior clusters of the venous follicles. The venous branches, from the labial and digital tentacles, andadjacent parts of the head and mouth, terminate, with those from thefunnel, in the sinus, partly excavated in the body of the cartilaginousskeleton, and in part continued round the oesophagus. From thissinus, the great vena cava {Jig. 217, «) is continued, running in theinterspace of the shell-muscles on the ventral aspect of the abdominal217. Nautilus Pompilius. cavity, and terminating within the pericardium by a slight dilatation(c), which receives by two veins {d) the blood from the differentviscera. The vena cava is separated by a layer of decussating mus-cular fibres from the abdominal cavity, which closely adheres to theparietes of the vein. There are several small intervals left betweenthe muscular fibres and corresponding round apertures {h) in themembrane of the vein and peritoneum. This communication withthe diffused sinuses occupying the general abdominal cavity, is similarto that already noticed in the Aplysia *: M. Valenciennes detectedthe same structure in the specimen of the Nautilus dissected by branchial circulation may be considered to commence, whenthe blood again begins to move from trunks to branches, four ofwhich trunks are continued from the terminal venous sinus to co
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
