11 



Paramoecium bursaria Ehrbg. 

 Body of medium size or large, length 110 — 140//, breadth 60— 110 /^ 

 The species were typical. One small specimen was found, but it is 

 not of sufficient importance to warrant the changing of the measure- 

 limits, it measured 85 f.t in length and 55 /< in breadth. 



Habitat: Lehen (Oct., Nov.), Hugstettin Freiburg (Nov.), Kandel 

 (Nov.), Zoological Garden (Oct., Jan.). 



Paramoecium putrinum 01. et L. 



Body of medium size or large, length 120—140;», breadth 50— 70/<. 



This species was found on two occasions only. I am able to corro- 

 borate Claparède et Lachmann as to the presence of a single con- 

 tractile vacuole. They say, «En outre, nous n'avons observé chez cette 

 espèce qu'une seule vésicule contractile, placée dans la moitié antérieure 

 de l'animal», and not, «dans la moitié postérieure» as quoted by Roux. 

 The presence of one contractile vacuole held good for about 50 per cent 

 of the specimens found by me. 



Habitat: Universitätswiese (Nov.), Brunnen Herdern (Dec). 



Uro centrum Nitzsch. 

 Of this genus, the species Urocentrum turbo was found. 



Urocentrum turbo 0. F. Müll. 

 Body of medium size, length 80 — 110 <<, breadth 64 — 90 /.i. 

 The specimens did not differ from the type. They were abundant. 

 Habitat: Lehen (Oct., Dec), Lochmatten (Dec), Waldsee Upper 

 (Dec). 



Pleuronema Duj. 

 Of this genus, the single species Pleuronema chri/salis was found. 



Pleuronema chrysalis 0. F. Müll. 

 Body small or of medium size, length 64 — 83 ft, breadth 32 — 42 /<. 

 The specimens were typical. I agree with Bütschli and Boux 

 who say that the contractile vacuole is posterior and dorsal, and is not 

 anteriorly located as stated by Saville Kent. 

 Habitat: Lochmatten (Dec). 



Lembadion Perty. 

 Of this genus, the single species Lembadion bulUnum was found. 



Lembadion bullinum 0. F. Müll. 



Body small or of medium size, length 58 — 110/(, breadth 36 — 65/<. 



The specimens were typical, the largest measuring 83 /t in length 



and having a maximum diameter of 52 //. Two aquaria in which this 



species was abundant were kept for a considerable time in order to see 



