246 PROCEEDINGS OF THE AMERICAN ACADEMY. 



" Avrainvillea longicaulis at Montego Bay grew imbedded in mud 

 among eel-grass in shallow water, near a small island consisting of man- 

 grove swamp. It was discovered by the sense of feeling as we were 

 dredging in the mud among the eel-grass roots for Caulerpa. We were 

 continually feeling through the thick soles of our rubber boots a sensa- 

 tion as of stepping on drowned kittens. It proved to be the curious 

 fleshy fronds of Avrainvillea, somewhat resembling a downy, dirty, 

 swollen Udotea, often full of worms and other small animals. Avrain- 

 villea grew also at Manchioneal, in an enclosed salt water pool, in eel- 

 grass with Penicillus dumetosus, rooted in a clean bottom of powdered 

 shells and coral ; but on the rocks bordering the pool was another species, 

 A. nigricans, with short stems, and tops not so flabellate, resembling in 

 shape our stemmed puff-balls." 



Udotea conglutinata (Sol.) Lamour. Closely set on bottom, Port 

 Maria, March 17, 1893, No. 269, H. 



U. flabellata Lamour. On sandy bottom, Port Antonio, March 3, 

 1893, No. 202 ; Port Maria, March 17, 1893, No. 268, H. On muddy 

 bottom, Port Antonio, July, 1894; washed ashore, Moraut Bay, P. & B. 



Halimeda Opuntia (L.) Lamour. In dense tufts, Port Maria, March, 

 1893, II. Port Antonio, July, 1891, P. & B. Near Kingston, Duerden. 

 Sloane. Growing similarly to the preceding species. 



H. tridens (Ell. & Sol.) Lamour. In tufts, St. Ann's Bay, March 23, 

 1893; Port Maria, March 17, 1893, II. Port Antonio, July, 1891, 

 growing in shallow water, in soil composed of broken shells and coral. 

 Near Kingston, Duerden. 



It is impossible to distinguish II. incrassata (Ell.) Lamour from H. 

 tridens. In any considerable collection typical forms of each and a 

 series of intermediate forms are to be found. 



II. Tuna (Ell. & Sol.) Lamour. In dense tufts, shallows, Port An- 

 tonio, March 10, 1893, No. 235, H. 



Codium adhaerens (Cabr.) Ag. Port Antonio, Aug., 1894, P. & B. 

 Specimen without locality, No. 293, H. 



C. tomentosum (Huds.) Stack. In immense tufts, Port Maria, March 

 17, 1893, No. 266, H. Port Antonio, July, 1891 ; Kingston, July, 

 1900, P. & B. Near Kingston, Duerden. Washed ashore in large 

 quantities, nearly everywhere. P. B.-A., No. 168. 



Valonia aegagropila Ag. On rocks in shallows, Port Maria, March 

 20, 1893, No. 296, H. Montego Bay, July, 1900, on rocks in shallow 

 water, P. & B. P. B.-A., No. 772. 



V. ventricosa J. Ag. On rocks in shallows, Port Antonio, March 11, 



