413 



are precisely similar to those of the latter. For the rest I must 

 refer to the accompanying ligure. 



Ectocarpus Hincksiæ occurs both in the littoral zone and in 



Fig. 72. Ectocarpus Hincksiæ Harv. a, b. c and d var. irrcgularis nov. var. a, b and c different parts of 



the plant with plurilocular sporangia ; cl cells with chromatophores. e var. tgpica. Plurilocular sporangia 



with involucre. n, b and c ltiO : 1 ; d and e 200 : 1. 



the sublittoral down to a depth of about 10 fathoms. It is most 

 commonly found on exposed coasts as an epiphyte on different 

 algæ; between tide-marks especially on, e. g. old Himanthalia lorea, 

 Alaria esculenta and Laminaria digitata. It has hitherto been found 

 with plurilocular sporangia only, these being observed in May, 

 June, July and October. 



