PREFACE. vii 



Enteromorpha intestinalis, Lyngb.-Harv. Ner. Bor<- Am. 3. 56. Providence to Newport. 



Enteromorpha compressa, Grev.-Harv. Ner. Bor. Am. 3. 56. Southern Rhode Island. 



Enteromorpha dlathrata, Grev.-Harv. Ner. Bov. Am. 3. 56. Newport. 



TJlva latissima, L.-Harv. Ner. Bor. Am. 3. 59. Providence. 



Ulva lactuca, L.-Harv. Ner. Bor. Am. 3. 60. Providence. 



Tetrasporalacunosa,CB.AVY.-RAViY. Ner. Bor. Am. 3. 61. T. perforata, Bailey Ms8. Providence. 



Tetraspora lubrica, Ag. Providence. 



Batrachospermum pulcherrimum, Hass. Providence. 



Batrachospermum moniliforme, Roth.-Harv. Ner. Bor. Am. 3. 63. Providence. 



Chmtophora endivsefolia, Ag.-Harv. Ner. Bor. Am. 3. 69. Pro.vidence. 



Draparnldia glomerata, Ag.-Harv. Ner. Bor. Am. 8. '72. Providence. 



Stigeoclonium minutum, Kutz. Providence. 



Gladophora rupestris, L.-Harv. Ner. Bor. Am. 3. 74. Newport. 



Gladophora glaucexcens, Griff.-Harv. Ner. Bor. Am. 3. 11. Rhode Island. 



Cladophora refracta, Roth.-Harv. Ner. Bor. Am. 3. 79. Southern Rhode Island. 



Gladophora Budolphiana, Ag.-Harv. Ner. Bor. Am. 3. 80. Providence. 



Gladophora gracilis, Griff.-Harv. Ker. Bor. Am. 3. 81. Little Compton. 



Gladophora fracta, Harv. Ner. Bor. Am. 3. 82. Rhode Island, Bailey. 



Ghsdomorpha aerea, Dillw.-Har. Ner. Bor. Am. 3. 86. Newport, etc. 



Ghastomorpha Olneyi, Harv. Ner. Bor. Am. 3, 86. Little Compton. 



Ghaetomorpha longiarticulata, Harv. Ner. Bor. Am. 3. 86. Little Compton. 



var. crassior, Harv. Ner. Bor. Am. 3. 86. Little Compton. 

 Ghaetomorpha sutoria, Berk.-Harv. Ner. Bor. Am. 3. 87. Newport. 

 Zygnema malformatum, Hass. 1. 147. Providence. 

 Zygnema catenasforme, Hass. 1. 147. Providence. 

 Zygnema Thwaitesii, Olnet, n. s. Near Z. subventricosum. Providence. 

 Zygnema longatum, Hass. 1. 151. Providence. 



Zygnema striata, Olney, n. s. " Cells evidently striated," Thwaites. Providence. 

 Tyndaridea bicornis'^ TS.ASS. 1. 162. Providence. 

 Tyndaridea insignis ? 'H.ASS. 1. 163. Providence. 

 Mesocarpus parvulus, Hass. 1. 169. Providence. 

 Mougeotia genufiexa, Ag.-Hass. 1. 173. Providence. 

 Vesiculifera concatenata, Hass. 1. 201. Providence. 

 Vesiculifera aequalis, Hass. 1. 205. Providence. 

 Vesiculifera bombycina, Hass. 1. 208. Providence. 

 Vesiculifera Gandollii, Hass. 1. 208. Providence. 

 Bulbocheete Thwaitesii, Olney, n. s. Providence. 

 Lyngbya majuscula, Harv. Bor. Am. 3. 101. Providence. 

 Sphaeroplea virescens. Berk. Providence. 

 Sphaeroplea punctalis. Berk. Providence. 

 Tolypothrix distorta, Kutz.-Hass. 1. 240. 



Galothrix confervicola, Ag -Harv. Ner. Bor. Am. 3. 105. Providence. 

 Galothrix scopulorum, Ag.-Harv. Ner. Bor. Am. 3. 105. Providence. 

 Hyalotheca dissiliens, Brev.-Ralfs. Des. 51. (Gloeoprium.) Providence. 

 Hyalotheca mucosa, Ehrh.-Ralfs. Des. 53. Providence. 

 Didymoprium Grevillii, Kutz.-Ralfs. Des. 61. Rhode Island, Bailey. 

 Bidymoprium Borreri, Ralfs. Des. 58. Rhode Island, Bailey. 

 Desmidium Swartzii, Ag. -Ralfs. Des. 61. Throughout United States, Bailey. 

 Aptogonum Baileyi, Ralfs Des. 209. Worden's Pond, Rhode Island, Bailey. 

 Micrasterias rotata, Ralfs. Des. 71. Providence. 

 Micrasterias radiosa, Aq.-Ralfs. Des. 72. Maine to Virginia, Bailey. 

 Micrasterias furcata, Ralfs. Des. 73. Worden's Pond, Rhode Island, Bailey. 

 Micrasterias Grux-Melitensis, Ralfs. Des. 73. Maine to Virginia, Bailey. 

 Micrasterias truncata, Breb. -Ralfs. Des. 75. United States, Bailey. 



