250 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Dictyota Bartayresiana Lamour. Washed ashore in mats, Port Anto- 

 nio, March, 1893, Nos. 154, 194, 229, H. Port Antonio, July, 1891 ; 

 on rocks in shallow water, Kingston, Montego Bay, Manchioneal, 1900, 

 P. & B. Near Kingston, Duerden. P. B.-A., No. 579. Found in both 

 broad and narrow forms, at nearly all the localities, often appearing like 

 two distinct species. 



D. cervicornis Kuetz. Washed ashore, Port Antonio, Aug., 1894, P. 

 & B. Near Kingston, Duerden. 



D. ciliata Ag. In tufts on rocks. Port Maria, March 16, 1893, Nos. 

 246 and 287; Port Antonio, March 10, 1893, No. 230, H. Washed 

 ashore, Montego Bay, Ora Cabessa, Manchioneal, 1900, P. & B. P. B.-A., 

 No. 779. All three kinds of fruit are represented in the specimens dis- 

 tributed in the Phycotheca Boreali- Americana, the plants being collected 

 at the same time. All are similarly arranged, occupying the whole of 

 the fertile segments, except a narrow strip at the margin. The male 

 plants are mostly old and battered, as if the antheridia were produced 

 somewhat earlier in the season than the other kinds of fruit. 



" Dictyota ciliata at Montego Bay, June 23, 1900, grew on boulders 

 near a precipitous rocky shore in water more than waist deep. It formed 

 large round clumps. The water being very clear here, the hairs on the 

 edge of the frond were so conspicuous as to easily distinguish in the water 

 this form from other Dictyotas. The rocks in this locality were beauti- 

 fully draped with the Dictyota, robust plants of Turbinaria in large thick 

 masses, a Sargassum with rounded leaves, and Stypopodium in magnifi- 

 cent clumps." 



D. dentata Lamour. Washed ashore, Port Maria, March 17, 1893, 

 No. 265, H. Port Antonio, July, 1891, P. & B. On rocks in rough 

 water, one meter or more deep. P. U., No. 669. Some specimens have 

 the tips of the branches so finely divided as to seem ciliate. 



D. dichotoma (Huds. ) Lamour. Kingston Harbor, July, 1891, R. P. 

 Bigelow. On rocks, Port Antonio, July, 1891 ; Montego Bay, June, 

 1900, P. & B. Chitty. 



D. divaricata Lamour. In various places, 1900, P. & B. Near Kings- 

 ton, Duerden. Connected by intermediate forms with D. Bartayresiana. 



D. fasciola (Roth) Lamour. Washed ashore, Port Antonio, July, 

 1891 ; Rio Novo, June, 1900, P. & B. 



Dilophus alternans J. Ag. Port Antonio, July, 1894, P. & B. 



D. Guineensis (Kuetz.) J. Ag. On flat rocks washed by the waves, 

 in company with Gelidium rigidum, Montego Bay, Rio Novo, June, 1900, 

 P. & B. 



