Can anyone identify orange feature 12 on this female Ocenbera erinaceus? The image showing feature 12 is of the animal removed from the shell with the mantle left intact over the features. In the other image the mantle has been mostly removed. Confirmation/correction of other features is welcome.
1: translucent mantle (other features seen through it).
2: thickened mantle edge.
3: mantle extension forming respiratory siphon (unrolled).
4: osphradium at base of siphon.
5: ctenidium.
6: hypobranchial gland containing greenish hypobranchial mucus.
7: rectum.
8: black rectal gland.
9: heart.
10: kidney.
11: visceral lump containing digestive gland and, in breeding season, ovary.
12: ?
13: afferent vessel of ctenidium.
13 should be 'efferent' not 'afferent' as it takes oxygenated haemolymph away from the ctenidium.
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