[Production of an anticoagulant substance by the cephalothoracic exocrine glands of the oestroides Cymothoidae Meinertia (Risso, 1826) and Anilocra physodes (L., 1758)].

An anti-clotting substance active on the blood of host-fish has been isolated in the two cymothoids Anilocra physodes and Meinertia oestroides. Experiments carried out with different tissue extracts have shown that this activity occurs in the cephalon, more exactly in the laterooesophageal glands. The intestine or caecum extracts have non anti-clotting power but on the other hand, show a strong hemolytic action.