138 Rhodora [AvavsT 
Dimerogramma minus (Greg.) Ralfs. 
Surirella (Ehrenb.) Grun. (Raphoneis Surirella 
Grev.) Occasional. 
Plagiogramma staurophorum (Greg.) Heib. (P. Gregorianum Grev.) 
Occasional, Quinnipiac. 
T validum Grev. Occasional, Leete’s Island. 
Licmophora flabellata (Carm.) Ag. Frequent. 
Juergensii Ag. Frequent. 
d tincta (Ag.) Grun. Frequent. 
Tabellaria fenestrata (Lyngb.) Kütz. Common. 
i floceulosa (Roth) Kütz. Common. 
Grammatophora oceanica var. macilenta (W. Sm.) Grun. 
Rhabdonema arcuatum (Lyngb.) Kütz. Occasional. 
^ adriaticum Ixütz. Common. 
Epithemia turgida (Ehrenb.) Kütz. Frequent. 
gibba (Ehrenb.) Kütz. Occasional. 
" “ — var. ventricosa (Ehrenb.) Grun. Frequent. 
E argus (Ehrenb.) Kütz. Frequent. 
- zebra (Ehrenb.) Kütz. Frequent. 
musculus Kütz. Frequent. 
Eunotia major (W. Sm.) Rab. Frequent. 
* praerupta Ehrenb. | Frequent. 
i “ var. bidens Grun. Frequent. 
“ gracilis (Ehrenb.) Rab. Frequent. 
“ — robusta Ralfs, including E. Diadema Ralfs. Frequent. 
“ elongata Rab. Frequent. 
Pseudoeunotia lunaris (Ehrenb.) Grun. (Eunotia lunaris Grun.) 
Locally abundant. 
: flexuosa (Bréb.) Grun. (Eunotia flexuosa Bréb.) 
Locally abundant. 
E flexuosa var. bicapitata Grun. Locally abundant. 
Actinella punctata Lewis. Common. 
Rhizosolenia styliformis Brightw. | Leete's Island. 
Isthmia nervosa Kütz. Frequent. 
Hemiaulus affinis Grun. South Haven. 
E tubulosus Brun. Occasional. 
Odontella aurita (Lyng.) Ag. (Biddulphia aurita Bréb.) Frequent. 
i turgida (W. Sm.) VH. Frequent. 
Biddulphia pulchella Gray. Frequent. 
Tuomeyi (Bail.) Roper. Occasional. 
Denticella mobiliensis (Bail.) Grev. (Biddulphia Baileyi W. Sm.) 
Rare. 
di rhombus Ehrenb.  (Biddulphia rhombus W. Sm.) Fre- 
quent. 
Eunotogramma laeve Grun. Occasional. 
Terpsinoe musica Ehrenb. | Occasional. 
i americana (Bail.) Ralfs. Occasional. 
