British Echinoderms.

A survey of the literature shows that there are some 61 British echinoderms about which we have sufficient information to be able to deduce with a fair degree of certainty the type of development which they follow. This is a larger proportion of the entire fauna than holds in other regions, and is attributable to the fact that most British species are found over a large part of the northern European seas, where most research work on the subject has been done. Taking first those species whose development is either known to be shortened, or which may be regarded as fairly certain to be so, we have the following list:—

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