. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 252 Annals of the South African Museum. This is the reno-pericardial canal. It is rather long, but its lumen and terminal opening are very narrow, and it might perhaps be mis- taken for one of the folds which project into the cavity of the kidney, an error which Joyeux-Laffuie probably made when he failed to find a reno-pericardial canal in the adult form of Onchidella celtica (Cuv.).* It will be seen from the description just given that the pericardium of these slugs communicates with the exterior b
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 252 Annals of the South African Museum. This is the reno-pericardial canal. It is rather long, but its lumen and terminal opening are very narrow, and it might perhaps be mis- taken for one of the folds which project into the cavity of the kidney, an error which Joyeux-Laffuie probably made when he failed to find a reno-pericardial canal in the adult form of Onchidella celtica (Cuv.).* It will be seen from the description just given that the pericardium of these slugs communicates with the exterior by way of the kidney, the ureter, and the terminal portion of the rectum. The kidney of. ureter rectvLm Diagram showing the relations of the kidney with the pericardium and the rectum. Onchidella may therefore be correctly regarded as an unpaired renal coelomoduct, which arises from the pericardium, extends throughout the whole length of the mantle-cavity, but discharges into the rectum by means of a short ureter. Possibly the mutual relations of these organs may be made clearer by the accompanying simplified diagram. Vascular System. Heart.—When viewed from the body-cavity, the ventricle of the heart can be seen through the thin inner wall of the anterior half of the pericardium, within which the ventricle lies (Plate XXVII, fig. 7 ; Plate XXIXc, fig. 44). The auricle, on the other hand, is hidden by the anterior part of the diaphragm, as it is situated towards the * Op. cit, pp. 259, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
