134 Rhodora [AvausT 
Navicula *theta Cleve. Local, Quinnipiac. 
E *tubulosa Brun. Occasional. 
Caloneis *Wardii Cleve. Occasional. 
Diploneis *didyma var. obliqua Brun. Occasional. 
Libellus rhombicus (Greg.) De Toni. (Navicula rhombica Greg.) 
Rhovconers trinodis (W. Sm.) Grev. (Navicula trinodis W. Sm.) 
Rare, Bristol. 
Stauroneis phoenicenteron (Nitzsch) Ehrenb. Abundant everywhere. 
gracilis W. Sm. Frequent. 
Gregoryi Ralfs. Occasional. 
spicula Hickie. Rare, Quinnipiac. 
salina W. Sm. Common along shore. 
^ Stodderi Lewis. Rare, Bristol. 
*nova britannica Terry. Rare; only in New Britain. 
i *Terryi Ward. Exceedingly rare; only in Bristol. 
Pleurostauron acutum (W. Sm.) Ralfs. (Stauroneis acuta W. Sm.) 
Common. 
Pleurosigma angulatum (Quek.) W. Sm. Frequent, local. 
var. aestuarii (Bréb.) VH. Occasional. 
elongatum W. Sm. Frequent. 
H " var. gracile Grun. Occasional. 
strigosum W. Sm. Rare, Clinton. 
naviculaceum Bréb. Rare. 
intermedium W.Sm. Rare, Clinton. 
nubecula W. Sm. Rare, Clinton, 
" latum Cleve. Rare. 
jormosum W. Sm. Occasional. 
hypocampus W.Sm. Frequent, local. 
decorum W. Sm. Locally abundant. 
E littorale W. Sm. Rather rare. 
balticum (Ehrenb.) W. Sm. Frequent, local. 
simile Grun. Rare, Leete’s Island. 
attenuatum W.Sm. Frequent, local. 
Wansbecki? Donk. Frequent. 
acuminatum (Kütz.) Grun. Rather rare. 
strigile W. Sm. Occasional. 
: affine Grun. & Cleve. Common all along the shore. 
*paradoxum Per. Occasional, Morris Creek. 
5 Brebissonii Grun. & Cleve. Frequent. 
*Terryanum Per. Local, Quinnipiac, Leete’s Island. 
Spencerüi (Quek.) W. Sm. Frequent, local. 
var. curvulum (Kütz.) Grun. Rare, Quinni- 
[11 
piac. 
jasciola W. Sm. Frequent. 
scalproides Rab. Rare. 
eximium (Thw.) Grun. & Cleve. Occasional. 
*americanum Per. Abundant, Morris Creek, New Haven. 
