1893.] MICROSCOPICAL JOURNAL. 289 



A Preliminary List of the Microscopical Animals 

 found in the Ridgewood Water-Supply. 



By SMITH ELY JElvLIFFE, M. D. 



BROOKLYN, N. Y. 



In the Bulletin of the Torrey Botanical Club for the month of 

 .Tune, 1893, there waspublisheJ a preliminary list of the micro- 

 scopical plants found in the Brooklyn water supply ; this pres- 

 ent list covers the same period of time from November 1st, 1892, 

 to Ma}' 1st, 1893, and presents the findings of weekly filtrates 

 taken from the water tap in the writer's house; these filtrates 

 were examined daily and the remainder of the filtrate was pre- 

 served for future work. 



The number of forms thus far encountered is very small when 

 compared to those found in the Cleveland water supply by 

 Mr. C. M. Vorce; there are, however, a few of interest and the fol- 

 lowing list includes only such forms about whose identity the 

 the writer feels fairly confident. 



EHIZOPODS. 



Amoeba proteus, (Rosel) Leidy, Found during Dec, and Feb. 



A. radiosa, Ehr. With the preceeding. 



Arcella vulgaris, Ehr. During April. 



Euglypha alveolata, Duj. During Feb., and April. 



INFUSORIA. 



Pleuromonas jaculans, Pty. Frequent. 

 Dinobryon sertularia. Ehr. Common. 

 Euglena viridis, Ehr. Not common. 

 E. ncus, Ehr. Scarce. 



Trachelomonas volvocina, Ehr. During the latter part of April. 

 T. cylindrica, Ehr. With the preceeding. 

 T. piscatoris, (Fisher) Stokes. April 9th, what seemed to be 

 this infusorium. 



Mallamonas plosslii, Pty, Quite frequent. 

 Paramonas globifera, From. Not infrequent. 

 Astasia trichophora, (Ehr.) Clap. April 23rd. 

 Heteromiia lens, (Mull.) S. K. Not frequent. 

 Synura uvella, Ehr. Infrequent. 

 Peridinium tabuhtum, (Ehr.) S. K. Not infrequent. 

 Crymnodinium fuscum, Ehr. Scarce. 

 Paramecium bursaria, (Ehr.) Focke. Scarce. 



