40 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



about a fortnight during the last Easter vacation. 

 Primarily I was engaged in collecting material and notes 

 for a L.M.B.C. Memoir on Gigartina mamilJosa. This 

 alga is extremely common along the coast of the district. 

 It usually occurs in company with Chondrus crispus, from 

 which plant it is readily distinguished by its infolded 

 margins, if the cystocarps are absent. A few specimens 

 of G. mamilJosa so closely resembled G. pistillata that at 

 first I took them for representatives of that species. I 

 will refer to this point again in my Memoir. At this 

 time of the year G. mamilJosa was well in fruit. The 

 cystocarps were nearly mature, or in many cases even 

 shedding the spores. In this respect G. mamilJosa 

 resembles most Phyllophora species, and many other 

 Floridea?, the i flowering ' of which takes place during 

 December and January, the fruit maturing during the 

 spring. I hope still to be able to find the tetraspores of 

 G. mamilJosa — unknown as yet — which should also occur 

 during the two months just mentioned. 



" Species of Delesseria, Laurencia, &c, were ' in 

 flower ' at Easter — Antherids, Procarps and Tetraspores 

 being frequently met with. 



" I collected about 150 different species of marine 

 algse from Port Erin Bay, Port St. Mary and the Calf 

 Sound, Miss E. Jordan adding a few from Dalby. Chorda 

 tomentosa is the only new record. It occurs, at low-tide 

 mark, at the southern end of the sandy shore of Port Erin 

 Bay, in pools and on rocks. It is often considered only a 

 young form of Ch. fihim. It differs, however, in the 

 structure of the hairs. These, always present in Ch. 

 tomentosa, contain numerous brown plastids, and are the 

 chief organs of assimilation in this plant. In Ch. filum 

 these hairs are always colourless, assimilation being car- 

 ried on by the cells of the main axis of the plant* 



