F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



255 



they are very like those found in the genus Herpochondria; com- 

 pare Falkenberg, Rhodomelaceen, p. 218. 



The filaments are about 300 — 400// thick. How far the thallus 

 is terete in my plant I have not been able to state, as all my 

 endeavours to make it reassume its original 

 form have been fruitless. The thallus in 

 Collin's plant is cylindrical. Compared 

 with the specimen in Phycotheca, my plant 

 is somewhat larger and seems to be more 

 loosely built, more flabby and on the 

 whole of a less firm consistency; the co- 

 lour, too, is lighter, more rosy red. 



My specimen is sterile. 



The plant was dredged in rather deep 

 water, about 15 fathoms. 



Fig. 247. Chondria poly- 



rhiza ColHns et Hervey. 



Part of the thallus with 



a bundle of rhizoids. 



(About 90:1). 



St. Jan.: Off Cruz Bay. 

 Geogr. Distr.: Bermudas. 



2. Chondria atropurpurea Harv. 



Harvey, W. H., Nereis Boreali-Americana, Part II, 1862, p. 22, pi. 18E. 



Chondriopsis atropurpurea J. Ag., Spec. Alg., vol. II, p. 801; Analecta 

 Algol., 1892, p. 150. Farlow, The marine Algæ of New England, Washington 

 1881, p. 167. 



Of this species I have found a single specimen only. 



This plant is especially characterized by its dark brown-red 

 colour and by its inordinate ramification. The secondary branches 

 are constricted at their base and tapering upwards. The ramuli 

 have nearly the same shape: fusiform. 



The specimen found is a male plant. The antheridial stands 

 are placed as usual at the upper end of the ramuli. 



It was gathered in the month of January in shallow water 

 in a sheltered locality. 



St. Croix: Casavagarden. 



Geogr. Distrib.: West Indies, Atlantic shore of the United States, 

 Brazil? Japan? 



3. Chondria littoralis Harv. 



Harvey, W. H., Nereis Bor.-Am., Part. II, p. 22. Falkenberg, P., 

 Rhodomelaceen, p. 197. 



Chondriopsis littoralis J. Ag., Spec. Alg., vol. II, pars III, p. 800; Ana- 

 lecta algologica, p. 160. 



