13 



-cv 



Fig. 1. Blepharisma 

 imisodus (Bütschli). 



C.V, Contractile Vacuole; 



N, Nucleus; pli^ Pharynx. 



Uroleptes musculus of Ehrenberg, which Bütschli identifies with his 

 Blepiiarisma musciihis. Other specimens were found Avhich were un- 

 doubtedly the Uroleptus musculus of Ehr en- 

 berg, but they were different. The specimens 

 placed here were flat and greatly compressed 

 with the anterior end bluntly rounded and 

 the posterior produced into a pointed tail-like 

 portion. The undulating membrane was well 

 developed. The macronucleus was moniliform 

 and consisted of from 6 — 8 nodes. The con- 

 tractile vacuole single and posterior. The co- 

 lour is a beautiful faint pink. It is fairly me- 

 tabolic and is very rare being found only in 

 one locality. 



Habitat: Kandel (Nov.). 



Spirostomum Ehrbg. 



Of this genus, only one species Spirosto- 

 mum ambiguum was found. 



Spirostomwn amhigimm Ehrbg. 



Body very variable, the length may vary from 2 — 4 mm. 



The specimens were typical. The body is thread-like and may be 

 slightly flattened. The macronucleus is moniliform. The micronucleus, 

 I have failed fo find, although I have examined many specimens and 

 also studied many sections, which I have treated with several different 

 stains e. g., Picro-carmine, Alum-carmine, Haematoxylin and Eosin, 

 and Borax-carmine. 



Habitat: Lehen (Oct., Nov.). Zoological Garden. In the tank in 

 the Zoological Garden it is found in great abundance all the year round. 



Bursaria 0. F. Müll. 



Of this genus, the single species Bursaria truncatella was found. 

 Bursaria truncatella 0. F. Müll. 



Body very large, length 700 f.i — 1,5 mm. 



The specimens were typical or differed little from the type. This 

 species is purse shaped, with the anterior end truncated and the posterior 

 end rounded. The macronucleus is band-like and flexuose. The con- 

 tractile vacuoles are very minute and distributed throughout the plasma. 



The species is very rare, being found only twice. 



Habitat: Lehen (Nov.), Zoological Garden (Jan.). 



Thylakidium Schew. 

 Of this genus, the species Thylakidium truncatum was found. 



