Abstract
Two years ago I read a paper before the Society in which I gave the results which I had obtained by crossing the two species of sea-urchin Echinus esculentus and Echinocardium cordatum . The first of these is a regular urchin, the second an enocyclic urchin belonging to the order Spatangoidea. The results recorded in that paper were briefly these:—The egg of Echinocardium fertilised by the sperm of Echinus gives rise to a hybrid which exhibits a mixture of maternal and paternal characters, but only a small proportion of the hybridised eggs develop. The egg of Echinus fertilised by the sperm of Echinocardium develops a fertilisation membrane, but then breaks up into a heap of globules by the process known as cytolysis, and dies. Since writing that paper my experiments were repeated at Plymouth by Fuchs, now my colleague at the Imperial College, and he obtained different results. According to him the eggs of Echinus fertilised by the sperm of Echinocardium gave rise to hybrid larvae which were maternal in character, whilst the eggs of Echinocardium fertilised by the sperm of Echinus gave rise to hybrids of two kinds, some purely maternal in type and some resembling those which I had obtained.
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