132 
Rhodora ` [AvausT 
Navicula var. dactylus (Ehrenb.) VH. (N. dactylus Kütz.) Abun- 
[11 
dant everywhere. 
gigas (Ehrenb.) Kütz. Common. 
major Kütz. Abundant everywhere. 
viridis (Nitzsch) Kütz. Abundant everywhere. 
cardinalis Ehrenb. Frequent, local, Bristol. 
yarrensis Grun. Occasional. 
divergens (W. Sm.) Ralfs. Frequent, local, Bristol. 
longa (Greg.) Ralfs. Frequent. 
lata Bréb. Frequent. 
borealis (Ehrenb.) Kütz. Frequent, local, Bristol. 
directa Ralfs. Occasional. 
Brebissonii Kütz. Frequent, local, Bristol. 
Tabellaria Kütz. Frequent, local. 
gibba (Ehrenb.) Kütz. Frequent, local, Bristol. 
Legumen Ehrenb. Occasional. 
polyonca Bréb. Frequent. 
peregrina (Ehrenb.) Kütz. Common. 
semen Ehrenb. Frequent, local, Bristol. 
zostereti Grun. Rare, Morris Creek. 
rhyncocephala Kütz. Occasional. 
cancellata Donk. Frequent, local, Fort Hale. 
fortis (Greg.) Grun. Occasional. 
digito-radiata (Greg.) Ralfs. Occasional. 
distans (W. Sm.) Ralfs. Occasional. 
brasiliensis Grun. Frequent. 
crabro (Ehrenb.) Kütz. Frequent. 
interrupta (Bail.) Kütz. Frequent. 
didyma Ehrenb. Common. 
bombus (Ehrenb.) Kütz. Occasional. 
Smithii Bréb. Frequent. 
fusca (Greg.) Ralfs. Frequent. 
advena A. Schm. Occasional. 
elliptica Kütz. Occasional. 
“ var. oblongella (Nàg.) VH. (N. oblongella Näg.) 
Occasional. 
lyra Ehrenb. Locally abundant. 
pygmaea Kütz. Local. 
Jorcipata Grev. Occasional, New Haven Harbor. 
caribaea Cleve. Occasional, New Haven Harbor. 
approximata Grey. Occasional, New Haven Harbor. 
irrorata Grev. Occasional. 
praetexta Ehrenb. Occasional. 
Hennedyi W. Sm. Occasional, Leete’s Island. 
clavata Greg. Occasional. 
polysticta Grev. Occasional, New Haven Harbor. 
hibernica O'M. Occasional. 
