A FRESH WATER JELEY FESH FROM 

 DELAWARE COUNTY, PENNA. 



RV KDWARD POTT.'^. • 



The well-known M(diis(r, or Jelly Fish, are of course fam- 

 iliar objects to all who visit our sea coast and its estuaries ; 

 but many persons are possibly ignorant of the fact that similar 

 forms have been found inhabiting fresh waters. 



At the present date but three of these have been reported. 

 The first was discovered in the warm-water tanks in which the 

 giant water lily ( Mctoria rcgia) was grown, in the Regent's 

 Park Gardens, of London, England. The second was found 

 living under purely natural conditions in Lake Tanganyika, 

 Central Africa. The third and last disclosed itself to the 

 writer in his own culture-jars in the neighborhood of Wawa, 

 Delaware County, Penna. 



To bring this interesting group briefly and not too techni- 

 cally to the attention of our readers, the editors have copied a 

 few^ of the plates used in illustration of an article upon this 

 subject, published by the " Quarterly Journal of Microscopic 

 Science," of London, England, in November, 1906, page 623, 

 etc., as follows : — 



Figure i. IJmiiocodiiou smcerbii, of Allman and Lankes- 

 ter ; discovered by Dr. Sowerby in 1880 in the 

 I'ictoria regia tanks, as above; described by 

 above in "Nature," 1 880, pages 147 and 178, etc. 

 Figure 2. IJinuooiida taiiga?iyic(f. Dr. R. Bohm ; first 

 seen by him in Lake Tanganyika in 1S83 ; 

 described from preserved specimens by R. T. 

 Ouenther, A. B., in "Annals and Magazine of 

 Natural History," 1893, P^g^ 269, etc. 

 Figure 3. A lateral view of the medusa of Miovhvdra 

 rvdi'ii : its development from which was first 

 seen at Wawa, Delaware Count^^ in small cul- 

 ture-jars, August r, 1897 ; discovery announced 

 in "American Naturalist," 1897, page 1032, etc. 



