ULVACE^. 57 



1. Enteromorpiia intestinalis, Link ; fronds jjerfectly simple, elongated, becoming 

 inflated, obtuse, tapering extremely to the base. Link, Hor. Fhys. Ber. p. 5. Grev. 

 Alg. Brit. p. 179- Harv. Phyc. Brit. t. 154. Wyatt, Alg. Damn. No. 80. E. Bot. 

 Sup. p. 2756. Kutz. Sp. Alg. p. 478. Ulva intestinalis, Linn. 



Hab. Whalefish Islands, Davis's Straits, L>r. Lyall. Boston Bay, Dr. Gray. Provi- 

 dence, Khode Island, Mr. Olney. New York Bay, Mr. Walters, ^-c. Beesley's Point, 

 Mr. Ashmead. Sullivan's Island, Mr. Ravenel. (v. v.) 



Very variable in the length and breadth of the frond. Old specimens are often much 

 inflated and bag-like ; tlie frond being 1-2 inches in diameter. Others, often from the 

 same locality, are not more than quarter of an inch in breadth. 



2. Enteromorpha compressa, Grev. ; fronds elongated, branched, cylindrical or sub- 

 compressed ; the branches simple or nearly so, long, obtuse, much attenuated at the 

 base. Grev. Alg. Brit. p. 180 t. 18. Harv. Phyc. Brit. tab. 335. Wyatt, Alg. 

 Danm. No. 168. Kutz. Sp. Alg. p. 480. 



Hab. Sea shores, extremely common, (v. v.) 



Under one or other of its many forms this species is found on all parts of the American 

 coast extending also up the estuaries of tidal rivers. Our most northern specimens 

 were collected in Lat. 75° 42' by Dr. Sutherland. 



3. ENTEROMORPHAcZa^Amto, Grev. ; frond tubular, tesselated, cylindrical, slender, very 

 much branched ; branches erect or spreading, sometimes squarrose, more or less beset 

 with slender tapering subulate ramuli. Grev. Alg. Brit. p. ISl. E. clathrata, erecta 

 et ramidosa, Hooh. Harv. Phyc. Brit. t. 340, t. 43, and t. 245. Wyatt, Alg. 

 Danm. Nos. 34, 166, and 208. E. clathrata, ramulosa, paradoxa, ^c. Kutz. Sp. Alg. 

 p. 479. 



Hab. Eock pools, &c. Rhode Island, Mr. Olney. Staten Island, New York, Professor 

 Bailey. Red Hook, &c., Messrs. Hooper and Calverley. Boston Bay, Captain Pike. 

 Beesley's Point, Mr. Ashmead. (v. v.) 



Very variable in appearance, but generally more slender and filiform than E. com- 

 pressa, and also more cylindrical. It is usually densely tufted, capillary, or setaceous, 

 soft to the touch and very much branched ; the branches either erecto-patent or patent ; 

 sometimes horizontal or squarrose, repeatedly decompound, and their ultimate divisions 

 furnished Avith slender ramuli that taper to a fine point, and are not constricted at base. 

 These ramuli are sometimes very numerous, sometimes few, and either short and spine- 

 like or elongated and filiform. When short, horizontally spreading, numerous and 



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