The discovery of Codium fragile subsp. tomentosoides in the shallow sounds of North Carolina marks a 450 km southward extension of the range of this weedy alga which first appeared in the western Atlantic in 1957. Codium taylorii, a tropical western Atlantic species, is reported from 33 m deep water 60 km offshore from Cape Fear. Since this locality is less well sampled than shallow water habitats, C. taylorii is not necessarily a recent introduction. The nearest previous records of this species were 600 km to the south in Florida and 1200 km to the east in Bermuda. © 1984, Walter de Gruyter. All rights reserved.