THE MARINE BOTANIST. 129 



low water-mark, and at a greater depth. Annual. 

 June to September. Sunderland. Yarmouth Beach. 

 Cromer. Torquay, Torpoint, Falmouth, Scilly 

 Islands, Jersey. Kilkee, Malbay, Bantry Bay, 

 Donaghadee, Belfast Bay, Howth, Malahide, 

 Carrickfergus, Saltcoats, Ardrossan, var. ^ teres. 

 At Wicklow and Kingstown Harbour, Dublin. 



LAURENCIA. 



Named in honour of M. de la Laurencie, a French Naturalist. 



Frond cylindrical or compressed, linear pinnately 

 branched; the apices obtuse; structure cellular, 

 solid. Fructification of two kinds, on distinct 

 individuals : 1. Ceramidia^ containing a tuft of pear- 

 shaped spores ; 2. Triparted tetraspores imbedded 

 in the ramuli. 



LAURENCIA PINNATIFIDA.— PINNA- 

 TIFID LAURENCIA. 



A variable plant with tufted fronds from one 



K 



