AND LIMSETIS BRACHYURA (o.F.M.). G5> 



Almost all the individuals seen carried eggs in the brood- 

 cavity. These eggs are of a most remarkable form (Figs, e 

 and /). Each egg is globular, with a diameter of 0-13 mm., 

 and its surface is covered with oblique and pretty deep furrows. 

 In addition to this it is clasped by two semicircular girdles, 

 having a breadth of 0*8 mm., and standing at light angles to 

 one another. 



The male of Limnadia lenticularis is unknown, and propagation 

 takes place parthenogenetically. 



In the same pond with Limnadia lenticularis the following 

 animals were found : 



Littoral. Pelac4ic. 



Planorbis albus. Volvox ylobator (in great num- 



„ nitidus. bers). 



( '//clops fuscus. A nabaena flosaq uae. 



,, serridatus. Daphnia longispina. 



Polyphemus pediculus. ,, penaata. 



Sida crystallina. Diaptomus gracilis. 



Diaphanosoma brachyurum. Corethra plumicornis (larvae). 



Scapholeberis mucronata. 

 Eurycercus lamellatus. 

 ( 'hydorus sphaericus. 

 Ciirvipes rufus 



,, conglobatus The Hydrachnidae were determined 



Xeiiniaiiia sjnnipes I by Dr. K. Thon. 



P rioaocercus uncinatus J 

 Rhipidodendron splendidu ni . 



In similar small ponds near Wittingau Apus prod act us is also 

 found, sometimes in great quantities in the spring, for these 

 ponds are dried up during the greater part of the year. 



Everywhere Limnadia lenticularis appears to be a very rare 

 form. Linne obtained it from Finland; after 114 years it was 

 found there again, near Helsingfors, by Sahlberg. It has 

 also been recorded from Sweden, Norway, and Denmark ; from 

 C4ermany (Berlin, Breslau, Mainz, Trier, Landshut, Worms, 

 Xeustadt in Mecklenburg, Strasburg, and last year near Walldorf 

 in Baden) ; and from France (near Fontainebleau). 



Jourx. Q. M. C, Series II.— No. 54. 5 



