If a similar examination be made of the allied genus Fissurella (fig.
The heart in Patella consists of a single auricle (not two as in Haliotis and Fissurella) and a ventricle; the former receives the blood from the branchial vein, the latter distributes it through a large aorta which soon leads into irregular blood-lacunae.
Fissurella, mantle and shell perforated at apex, British.
17.-Dorsal aspect of a specimen of Fissurella from which the shell has been removed, whilst the anterior area of the mantle-skirt has been longitudinally slit and its sides reflected.
C, Of Fissurella: letters as in A.