COLLINS. — THE ALGAE OF JAMAICA. 245 



C. plumaris forma brevipes (J. Ag.) Weber. Port Antonio, July, 

 1891; Montego Bay, July, 1900, among eel-grass at about one meter 

 depth, P. & B. P. B.-A., No. 7 06. P. U., No. 672. Near King- 

 ston, Duerden. 



C. prolifera (Forsk.) Lamour. Washed ashore, not common, Port 

 Morant, July, 1900, P. & B. 



C. racemosa var. clavifera (Turn.) Ag. Port Antonio; Port Morant, 

 at about one meter depth, July, 1900, P. & B. In tufts on rocks, 

 Kingston, April 8, 1893. No. 370, H. P. B.-A., No. 767. 



C. racemosa var. clavifera forma macrophysa (Kuetz.) Weber. On 

 coral reef, Port Antonio, 1894 & 1900, P. & B. Near Kingston, 

 Duerden, passing insensibly into var. clavifera. P. B.-A., No. 870. 



C. taxifolia (Vahl) Ag. Washed ashore. Port Morant, July, 1900. 

 Annotto Bay, 1894, P. & B. Chitty. P. B.-A., No. 768. 



C. verticillata J. Ag. In tufts on coral rocks. Port Antonio, Feb. 27, 

 1893, No. 181, H. Near Kingston, Duerden. 



C. verticillata forma charoides (Elarv.) Weber. Kingston, June, 

 1900, P. & B. Forming fine moss-like mats in soft mud near Man- 

 grove swamp, at depth of about one meter. Near Kingston, Duerden. 



Peuicillus capitatus Lam. Port Antonio, Montego Bay, Mancliioneal, 

 nearly buried in coral sand, 1900, P. & B. Port Maria, No. 294, H. 

 Sloane. P. B.-A., No. 271. P. U., No. 523. Near Kingston, 

 Duerden. 



P. dumetosus (Lamour.) Decsne. Annotto Bay, washed ashore, 

 Manchioneal, July, 1900, P. & B. Specimen without locality, H. 

 P. B.-A., No. 769. 



"■ Penicillus dumetosus grew in some abundance in a pool near Man- 

 chioneal. The pool was narrow, with precipitous tufa walls, which 

 towards the sea closed over the pool in an arch, through which the waves 

 broke heavily. The Penicillus grew among eel-grass, in muddy soil, 

 covered by a coating of powdered shell and coral. With it were P. 

 capitatus, Avrainvillea longicaulis, and Halimedas. The P. dumetosus 

 looked like miniature groves of carefully trimmed evergreen trees, gray 

 green in color." 



Rhipocephalus Phoenix (Ell. & Sol.) Kuetz. Port Morant, a single 

 specimen washed ashore, July, 1900, P. & B. 



Avrainvillea longicaulis (Kuetz.) Murray & Boodle. Montego Bay, 

 June, Manchioneal, July, 1900, P. & B. P. B.-A., No. 770. 



Avrainvillea nigricans Decsne. Singly in shallows, Port Maria, 

 March 17, 1893, No. 270, H. Manchioneal, July, 1900, P. & B. 

 P. B.-A., No. 771. 



