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From time to time, in connexion with work on the metabolism of parasitic nemaodes, attention has been drawn to the presence of haemoglobin in a number of species. Aducco (1889) observed that the red colour ofDioctophyme renale is due to a pigment resembling vertebrate haemoglobin. More recently haemoglobin has been recorded inAscaris lumbricoides andParascaris equorum (Keilin 1925), inNematodirus, Ostertagia and otherTrichostrongylidae of sheep (Davey 1938) and inCamallanus (Wharton 1938). Among tissue parasites the pigment was demonstrated y Stannard, McCoy &amp; Latchford (1938) inTrichinella larvae and by v. Brand (1937) in a larvalEustrongylides from the mesentery ofFundulus. The presence of haemoglobins in parasitic worms has been suggested as evidence that they were essential to supply oxygen to the oxidative systems (Davey 1938; Brand 1938). But not all authors presented evidence that the haemoglobins they observed were different from the haemoglobin of the host. Keilin (1925), however, observed thatAscaris lumbricoides contains two haemoglobins which could be distinguished spectroscopically from each other and from the host haemo­globin. These pigments were re-examined by Davenport (1949) and were found to have extremely high oxygen affinities, the consequence of a very low deoxygenation velocity. The oxygen equilibrium relations of the haemoglobins could not be determined directly but it was shown thatAscaris is capable of bringing about deoxygenation of the body-wall haemoglobin when kept under anaerobic con­ditions. Similarly Aducco (1889) observed that the haemoglobin ofDioctophyme is extremely resistant to deoxygenationin vacuo .

The haemoglobins of Nippostrongylus muris (Yokagawa) and Strongylus spp