387 



cies which is a West Indian representative of this genus, but, 

 having had so very little and quite sterile material at my disposal, 

 I prefer to leave it unnamed. 



The plant was dredged in deep sea at a depht of about 15 

 fathoms. 



St. Jan: off Annaberg. 



Subfam. 2. Rhodymenieae. 

 Rhodymenia Grev., J. Ag. 



1. Rhodymenia occidentalis nov. sp. 



Frons plana, membranacea, 25 cm longa et ultra, crebre 

 dichotomo-furcata, subflabellata, furcationibus angustioribus, la- 

 ciniis ca. 4 mm latis, margine nuda, interdum prolifera, summis 

 late rotundatis, basi sub- 

 terete-stipitata. 



Frons ex duobus 

 stratis composita, cellulis 

 exterioribus corticalibus 

 minutis, interioribus ad 

 medium versus gradatim 

 majoribus, rotundatis- 

 polygonatis. 



Organa fructificatio- 

 nis ignota. 



The plant is fastened 

 to the substratum by 

 means of a disc from 

 which proliferations often 

 arise. The thallus is flat, 

 membranaceous. It is 

 narrow near the base, but 

 scarcely quite terete ; up- 

 wards it is evenly broad- 

 ened out until it reaches 

 its normal breadth, about 

 4 mm. The thallus is re- 

 peatedly forked; in the 



25* 



Fig. 371. Rhodymenia occidentalis nov. spec. 

 Part of a plant. (About - 3). 



