1907] Terry,— Partial List of Connecticut Diatoms 139 
Amphitetras antediluvianus Ehrenb. Frequent. 
Triceratium alternans Bail. Occasional. 
É flavum Ehrenb. Frequent. 
Lithodesmium undulatum Ehrenb. Leete’s Island. 
Syndendrium diadema Ehrenb. Occasional. 
Periptera tetracladia Ehrenb. Occasional. 
Pyxilla baltica Grun. Frequent; locally abundant, Leete's Island. 
Ditylium Brightwellii (West) Grun. including D. inaequale Bail., 
D. tetragonum Bail., and D. trigonum Bail. Very rare, 
Branford only. 
intricatum (West) Grun. Very rare, Branford. 
Auliscus pruinosus Bail. Frequent. 
s sculptus (W. Sm.) Ralfs. Common. 
T caelatus Bail. Occasional. 
Macraéanus Grev. Occasional. 
Pseudoauliscus radiatus (Bail.) Rattray. Rare, Leete’s Island. 
Cerataulus levis (Ehrenb.) Ralfs. (C. polymorphus VH. Biddulphia 
levis Ehrenb.) Frequent. 
Eupodiscus Rodgersii Ehrenb. Rare, Leete's Island. 
argus Ehrenb. Frequent. 
Stephanop yxis turris (Grev.) Ralfs. Occasional, New Haven. 
* var. intermedia Grun. (S. appendiculata var. inter- 
media Grun.) Occasional. 
» jerox (Grev.) Ralfs. Occasional, Milford. 
p corona (Ehrenb.) Grun. Occasional. 
Stephanodiscus niagarae Ehrenb. Rare. 
Actinocyclus crassus VH. Frequent. 
Raljsii (W. Sm.) Ralfs. Frequent. 
“ Barkleyi (Ehrenb.) Grun. Abundant, Morris Cove. 
" Ehrenbergit Ralfs. Frequent. 
tenuissimus Cleve. Rare, Morris Cove. 
[ subtilis (Greg.) Ralfs. Rare, Morris Cove. 
triradiatus Roper. Rare, Leete's Island. 
Coscinodiscus excentricus Ehrenb. | Frequent. 
3 nitidus Greg. Frequent. 
symbolophor us Grun. Occasional. 
subtilis Ehrenb. Rare, local. 
marginatus Ehrenb. Occasional. 
radiatus Ehrenb. Frequent. 
concinnus W. Sm. Frequent. 
gigas Ehrenb. Rare, Leete’s Island. 
asteromphalus Ehrenb. Frequent. 
oculus-iridis Ehrenb. Frequent. 
apiculatus Ehrenb. Frequent. 
Lysigonium moniliforme (Mull. Link. (Melosira  Borreri Grev.) 
Locally abundant. 
varians (Ag.) De Toni. (Melosira varians Ag.) Abun- 
dant. 
sé 
ce 
[2j 
