252 PROCEEDINGS OF THE AMERICAN ACADEMY. 



L. decussata Mont. Washed ashore, Hope Bay, July, 1891, and Aug., 

 1894, P. & B. Very abundant in 1894. P. B.-A., No. 89. The finest 

 species of the genus, with fronds in shape of a fir tree, sometimes over a 

 meter in length. Apparently confined to the islands on the two sides of 

 the Atlantic. 



L. elongata Zan. Hope Bay, July, 1891 ; Montego Bay, July, 1900, 

 P. & B. 



L. pulverulenta Ag. Washed ashore, Manchioneal, July, 1900, P. 

 & B. 



L. valida Harv. In large tufts, Port Maria, March 17, 1893, No. 

 283; Port Antonio, March 10, 1893, No. 240, H. Hope Bay, Orange 

 Bay, Montego Bay, 1891 and 1900, P. & B. Under No. 687, P. B.-A., 

 a form was distributed as L. tenuis, which it now seems better to regard 

 as L. valida. It is difficult to see how the two species can be distin- 

 guished, when one has a large number of specimens. Harvey's name, 

 being the older, must be maintained. 



Galaxaura cylindrica (Sol.) Decsne. Port Antonio, Morant Bay 

 Manchioneal and elsewhere, common, P. & B. Near Kingston, Duerden. 

 Sloane. Chitty. P. B.-A., No. 134. 



G. lapidescens (Sol.) Lamour. In large tufts, Port Antonio, March 

 10, 1893, No. 239, H. Annotto Bay, Port Antonio, July, 1891 ; Mon- 

 tego Bay, on rocks, June, 1900, P. & B. Chitty. Not so common as 

 other species of the genus. 



G. marginata (Ell. & Sol.) Lamour. On stones at tide-mark. Port An- 

 tonio, March 10, No. 145 ; March 21, No. 241, H. Port Antonio, An- 

 notto Bay, Montego Bay, Manchioneal, 1900, P. & B. Common, 

 growing very densely on rocks. 



G. obtusata (Ell. & Sol.) Lamour. Port Antonio, July, 1891 ; Port 

 Maria, July, 1900, P. & B., in company with other species of the genus. 



G. rugosa (Sol.) Lamour. In large tufts. Port Antonio, March, 1893, 

 No. 131, H. Port Antonio, July, 1891 ; Rio Novo, Rio Bono, Montego 

 Bay, 1900, P. & B. Near Kingston, Duerden. P. B.-A., No. 133. 

 P. U., No. 510. Sloane. Usually washed ashore on beaches. 



Wrangelia Argus Mont. Montego Bay, June, 1900, forming soft 

 mats on rocks, P. & B. Specimen without locality, H. 



Gelidium coerulescens Crouan. Port Antonio, July, 1891 ; July, 

 1900, P. & B. P. B.-A., No. 783. 



By the kindness of Dr. Bornet this plant has been compared with 

 authentic specimens from Guadeloupe, and it is the plant referred to by 

 Maze & Schramm, Algues de Guadeloupe, p. 199. Whether it is the 



