Marine Plants on the N. E. United States. 29 



are also found along with these in all stages of growth. The Sea 

 Colander or Ar/arum Turneri is here, too, a well known plant. It 

 grows sometimes to the size of from ten to twelve feet. For the 

 most part it is a deep water plant, but it yet frequently appears on 

 the shore among the Laminaria. Only dwarf specimens are how- 

 ever found here, showing that this is not its natural home. I 

 picked lip a small plant of this species which had an anomalous 

 peculiarity in the shape of a trilaminate frond. " From the cen- 

 " tre of its laminae along its whole length there projects a wing 

 " or additional lamina, making with the two halves of the true 

 " leaf a third lamina" This peculiarity has evidently arisen from 

 the splitting up of one of the laminae of the frond. I would infer 

 this from the fact that the lamina to which the third one is in- 

 clined, and to which it is united at the midrib, is thinner than the 

 lamina on the other side of the midrib. The perforations also on 

 the two associated laminae correspond in many respects, although 

 the mother lamina seems to have grown considerably since the 

 separation of one half of its substance took place. I am parti' 

 cular in noting this, as I find in Harvey's Nereis Borealis a Lam- 

 inaria described as L. trUaminata on account of a peculiarity of 

 identically the same kind as that which I have noted. The des- 

 cription of that species is taken from Olney's hst of the Rhode 

 Island plants, published in the proceedings of the Providence 

 Franklin Society. Harvey is doubtful about it, and had he seen a 

 good specimen of the so called plant, he would at once have detected 

 its origin, and refused it a place as a distinct species. It can be 

 considered as nothing more than an anomalous form. The most 

 interesting and curious of the plants that are found in this belt is 

 the Alaria escidenta. It is found on the Atlantic shores of Ame- 

 rica, from Newfoundland to Cape Cod, and is abundant on the 

 west coast of Scotland and Ireland. " It has a root of many 

 grasping fibres, a stem naked at the base and cylindrical, from two 

 to four lines in diameter, and from eight to ten inches in length. 

 On its lower half there are numerous stemless leaflets, above which 

 the stem is winged on each side, and passes gradually into the 

 midrib of a foliaceous frond which is from one to twenty feet or 

 more in length." — Harv. It is of a bright olive colour, and cover- 

 ed over with a very adhesive mucous. Unlike most others of 

 the order to which it belongs it adheres closely to paper. Its 

 natural home seems to be about low water mark, among the rocks 

 of the shore. It is in many respects a beautiful plant, and its 



