A Rare Species of Mysid from the Plymouth Area

WHEN my husband, the late Prof. W. M. Tattersall, was examining material collected in the Plymouth area for his work on "The Seasonal Occurrence of Mysids off Plymouth"1, he found a single adult male specimen from St. L.4 belonging to the genus Heteromysis. At that time only one species of this genus had been recorded from British waters, namely, Heteromysis formosa S. I. Smith. This species, though rare, had been recorded occasionally from Plymouth2, the Channel Islands and from Scottish and Irish waters. As the male from Plymouth was undoubtedly a Heteromysis, it was not examined in detail but was recorded as H. formosa.