1893.] MICROSCOnCAL JOURNAL. 289 



A Preliminary List of the Microscopical Animals 

 found in the Ridj^ewood Water-Supply. 



By SMITH KLY JELLII-FU, M. D. 

 BB(»()KLyN, N. Y. 



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

 June, 1893, there \vasi»ublishe] a preliminary list of the micro- 

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

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

 to May 1st, 1893, and presents the findings of weekly filtrates 

 taken from the water ta]> in the writer's house; these filtrates 

 were examined daily and the remainder of the filtrate wa.s pre- 

 served for future work. 



The number of forms thus far encountered is very small when 

 com])ared 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. 



RHIZOPODS. 



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



A. radiosd, Ehr. With the preceeding. 



Arcella vulgaris, Ehr. During April. 



Euf/lypha alveolata, Duj. During Feb., and April. 



INFUSORIA. 



Pleuromuna.:i jaculans, Pty. Frequent. 

 Dinobryon sertularia. Ehr. Common. 

 Euglena viridia, Ehr. Not common. 

 E. acus, Ehr. Scarce. 



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

 T. cylindrica, EiiV. With the preceeding. 

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

 this infusorium. 



Mallamonas plosslii, Pty. Quite frequent. 

 Paramcriias globifera, From. Not infrequent. 

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

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

 Synura uvella, Ehr. Infrequent. 

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

 Gymnodinium fuscum, Ehr. Scarce. 

 Paramecium hursaria, (Ehr.) Focke. Scarce. 



