Abstract
Twenty six spp. of unarmored Dinophyceae from shallow embayments on the s. shore of Cape Cod were described. Twelve of these were considered as new species and 9 of the remainder showed extensions of range from Europe. Eight genera were represented in this study, Oxyrrhis, Amphidinium with 2 new spp., Gymnodinium with 3 new spp., Massartia, Gyrodinium with 8 new spp., Warnowia, Nematodinium, Polykrikos. The genus with the greatest number of [image] spp. was Gyrodinium, which was represented by 9 spp.

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