306 chas. w. hargitt. 



during succeeding days, but no trace of a hydroid was found. 

 The material was kept in my laboratory, which has a fairly con- 

 stant temperature, for several weeks, indeed months, and repeated 

 examinations made from time to time, but no trace of any hydroid 

 form appeared, though species of Protozoa and rotifers continued 

 to live and thrive quite normally. Such are the facts as to locality 

 and conditions under which the medusae were found. Their 

 similarity to those concerned in the appearance of the same 

 medusa in London many years ago is quite striking. Its 

 occurrence later at several places on the continent has been 

 recorded by several observers. The most recent is that of its 

 appearance at the botanical garden at Munich in the basin con- 

 taining the giant water lily, Victoria regia. Boecker's account, 

 which appeared in the Biologisches Centralblatt (Bd. XXV., p. 

 605, 1905), agrees in most respects with the earlier records, and 

 with the foregoing as well. He regards the Munich species as 

 probably identical with Limnocodium sozverbii, the occurrence of 

 which in the Victoria tanks of Regents Park, London, had been 

 variously described by Lankester (Quar.Jour. Mic. Set., Vol. XX., 

 1880), Allman (Jour. Linn. Soc, Vol. XV., 1881), and Gunther 

 (Quar. Jour. Mic. Sci., Vol. XXXV.). Some further notice will 

 be taken of Boecker's records in a later connection. 



General Features and Relations. 

 The Washington species agree in most respects quite closely 

 with the original descriptions and figures of Limnocodium sowerbii, 



of Allman and Lankester. As 

 compared with the verbal de- 

 scription of Boecker (op. cit.), 

 there are some slight differences. 

 For example, he says that the 

 Munich species are characterized 

 by a rather high-arched bell. 

 In my species the bell is rather 

 F t ^ low, often disc-like. Figs. 1, 2, 



3, 4, drawn from life in different 

 aspects, will make this point more evident and striking. How- 

 ever, this difference I do not consider of very great importance. 



