Abstract
Comparative studies are described of the life histories and gonadal development of three sand-dwelling cumaceans from Kames Bay, Isle of Cumbrae, Scotland. Cumopsis goodsiri, an intertidal species, and Iphinöe trispinosa, a sublittoral species, produce two generations per year. An overwintering generation produces young during May and June which mature rapidly and produce young forming the next overwintering generation in August. Pseudocuma longicornis, also a sublittoral species, breeds continuously throughout the year.
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