Two nematodes, a male and a female, were found in the stomach of a haddock, Gadus aeglefinus Linn.; they were lying close together and protruding from the wall of the stomach into its cavity. They were sent to Mr Stephen Prudhoe of the British Museum (N.H.), who identified them as probably Ascarophis morrhuae van Beneden. The worms were the only two nematodes found in this fish, and on account of their proximity, and the fact that they both belong to the genus Ascarophis, it is assumed that they are a pair. As the male of this species has not apparently been described so far, an account of the single specimen is given below.