Abstract
1. 1. Methanol and acetone extracts of the hypobranchial gland (dye-secreting area) of the two gasteropod molluscs Thais haemastoma and Thais haemastoma floridana contain large amounts of dihydromurexine (up to 12–17 mg. per g. fresh tissue) and senecioylcholine (up to 15–18 mg. per g.), small amounts of murexine, and variable amounts of choline (up to 5 mg. per g.), urocanic acid, imidazolepropionic acid, methylurocanate, and methylimidazolepropionate. 2. 2. Whereas the choline esters are already present in the living tissue, the other compounds must be considered, at least to great extent, as artifacts due to post-mortal hydrolysis and transesterification processes.
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