It has been shown in a recent paper by Russell (1940) that in addition to Podocoryne cornea M. Sars, 1846, and the so-called P. areolata , two other Podocoryne medusae, viz. P. hartlaubi Neppi & Stiasny, 1913, and P. minima (Trinci), also occur in the plankton in British waters. The identity of both hydroid and medusa of the European P. cornea is well established arid the medusa has never been known to mature with more than 8 tentacles (Kramp, 1927; Russell, 1940). P. minima is a small medusa with only 4 tentacles and need not be considered further in this paper.
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W. J. Rees (1941) studied this question.