THE AMERICAN MIDLAND NATURALIST. 



OCHROMONADACEAE. 



Dinobnjon sp. 1st lake, C. S. H. — L. N. J. 

 Uroglena volvox Ehrb., 2nd lake, C. S. H.— L. N. J. 



IV.— DINOFLAGELLATAE.* 



GYMNODINIACEAE. 



*Gy m nodi/i/ mu gracile (Bergh.) — C. J. Fish. 

 Gym nodi mum sp. C. S. H. — N. M. G. 



PERIDINIACEAE. 



Ceratium tripos Nitzsch. C. S. H. — D. S. J. 



*Ceratium long i pes (Nitzsch) Bail. — H. B. Bigelow and C. 



J. Fish. 

 *Cera£ium fusus (Nitzsch) Duj. — H. B. Bigelow and C. J. 



Fish. 

 *Ceratium macroceras (Nitzsch) Ehrb. — H. B. Bigelow and 



C. J. Fish. 

 ^Ceratium bucephalum (Nitzsch) CI. — H. B. Bigelow and 



C. J. Fish. 

 *Ceratium heteroeamptum (Nitzsch) — H. B. Bigelow and C. 



J. Fish. 

 Dinophysis caudata Kent, C. S. H. — N. M. G. 

 *Glenodi iiium compressa Calkins — C. J. Fish. 

 *Gonymdax tricantha Jorg. — C. J. Fish. 

 *Peridinium depressum Bailey — C. J. Fish. 

 *Peridinium oceamcum var. oblongum Aurivillus — C. J. Fish. 

 Peridininm sp.— C. S. H.— N. M. G. 



SILICOFLAGELLATAE. 



Distephamis speculum Haeckel — C. J. Fish. 

 Dictyoeha fibula Ehrb. — C. J. Fish. 



* Species starred are those normally a part of the plankton of the 

 adjoining regions, and under varying conditions may be found in Cold 

 Spring Harbor. I am indebted to Dr. C. J. Fish of the U. S. Bureau 

 of Fisheries, Woods Hole, Mass., and Dr. H. B. Bigelow, Museum of 

 Comparative Zoology, Harvard College, Cambridge, Mass., for the data 

 they have supplied. 



* Nomenclature revised provisionally by Professor C. A. Kofoid, 

 University of California for whose cooperation the writer desires to- 

 express his appreciation. 



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