15 



and to have a breadth of 0,19 mm across the frontal field. The body 

 is colourless or grayish yellow, and when fully expanded assumes a 

 beautiful trumjiet-shape. The frontal field of this species shows the 

 highest development of any Stentor. The macronucleus may be cord- 

 like or moniliform, and previous to or after division may be partly mo- 

 niliform partly cord-like. I agree with Johnson in the view that the 

 sheath is not due to a mucilaginous secretion, but is wholly composed 

 of the slime among which the animal usually anchors itself. 



Habitat: Lehen (Oct., Nov.), Hugstettin (Nov.), Universitätswiese 

 (Nov., Dec), Waldsee Upper (Dec), Zoological Garden (Oct., Jan.). 



Stentor igneus Ehrbg. 

 Body large or very large, length 200 — 400 i^i. 

 The specimens Avere typical, but very faintly coloured, and possess- 

 ing not a single macronucleus, but usually from 2 — 5. 

 Habitat: Lehen (Nov.). 



Stentor niger Ehrbg. 

 Body very large, length 270 — 400 ^<. 



The specimens did not differ in any marked degree from the type. 

 Habitat : Lehen (Nov.). 



Stentor multiformis 0. F. Müll. 



Body of medium size, length 80 — 105 //. 



This species I took at first for a small Stentor coerideiis. It has 

 been described as a dwarf Stentor coeruleus by Grub er, and as Stentor 

 multiformis by Stein. It was first described by 0. F. Müller as 

 Vorticella multiformis. 



Habitat: Lehen (Oct.), Zoological Garden (Dec, Jan.). 



Caenomorpha Perty. 

 Of this genus, the single species Caenomorpha medusula was found. 



Caenomorpha medusula Perty. 

 Body small or of medium size length 80 — 110 /<, breadth 50 — 60^«. 

 The specimens agreed very closely with the description of Perty, 

 not differing in any essential point. 



Habitat: Lehen (Nov.), Moosewald (Oct.). 



Olig'otricha. 



This order is represented by members of the two families Halterina 

 and Tintinnoïna. 



Stromhilidium Schew. 

 Of this genus the single species, Strombilidium ggrans was found. 



