is cut in two : — and Mrs. Wyatt has only met with it once. This 

 is, however, not to be wondered at, if we consider the extremely 

 local nature of many species of Ectocarpus, and that Salcombe, 

 the habitat of our novelty, is a considerable distance from the 

 discoverer's ordinary abode. In appearance E. fenestrates is 

 not unlike many specimens of E. siliculosus, but the form of the 

 silicule is very different ; and in this character there is a much 

 nearer approach to E. tomentosus, a species, which in all other 

 respects, is widely different from E.fenestratus. 



Fig. 1. Ectocarpus fenestratus ; a tuft : — the natural size.. 2. Portion of a 

 filament: — magnified. 3. Small part of the same, with two ripe silicules. 

 4. Apex, with two young silicules : — both highly magnified. 



