118 PLANTS OF RHODE ISLAND. 
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MELOSIRBRA, Ag. 
nummuloides, Dillw. Newport, S. A. Briggs; common 
elsewhere. 
moniliformis, Ag. Mark Rock, S. A. Briggs. 
sulcata, Ehrb. Newport, S. A. Briggs. 
granulata, Ehrb. Newport, S. A. Briggs. 
STEHEPHANODISCUS, Ebrb. 
, Sp. Eaton Farm (fossil), Mr. Carr. 
STHPHANOPYXIS, Ehrb. 
ferax, Grev. Newport, S. A. Briggs. 
COSCINODISCUS, Ehrb. 
lineatus, Ehrb. Rocky Point, S. A. Briggs. 
ACTINOPTYCHUS, Ehrb. 
undulatus, Ehrb. Newport, S. A. Briggs. 
BIDDULPHIA, Gray. 
pulchella, Gray. Rocky Point, S. A. Briggs, J. L. B. 
ISTHMIA, Ag. 
nervosa, Kutz. Newport, &c. 
CHATOCEROS, Ebrb. 
n. sp., Briggs. . Newport, S. A. Briggs. 
SYNDENDRIUM, Ebrb. 
Diadema, Ehrb. Newport, S. A. Briggs. 
. COCCONEIS, Ehbrb. 
dirupta, Greg. Rocky Point, S. A. Briggs. 
scutellum, Ehrb. Newport, S. A. Briggs. 
ACHNANTHES, Bory. 
longipes, Ag. Newport, S. A. Briggs. 
brevipes, Ag. Rocky Point, Newport, &c., S. A. Briggs. 
subsessilis, Kutz. Rocky Point, S. A. Briggs. 
CYMBELLA, (Ag.) Kutz. 
gastroides, (Kutz.) Providence, &c. 
COCCONEMA, Ehbrb. 
lanceolatum, Ehrb. Providence, Olney. No. 181. 
cymbiforme, Ehrb. Providence, Olney. No. 182. 
