LEPTOTKICHE^E AND CLADOTRICHEJE. 



707 



growth and binary division of those lying deeper, or by their own motility 

 "swarm stage"; they may emerge from the sheath either solitary or in 

 chains of several elements. Sometimes the cocci-like forms germinate 

 within the common sheath and grow out through its walls into filaments. 

 Fragments of the filaments are sometimes seen to exhibit peculiar gliding 

 movements; again they may exhibit very active movements as a result of 

 the development of terminal flagella. The filaments are sometimes straight 

 and sometimes twisted in spiral form, the spiral turns being sometimes quite 

 flat and at others well-developed corkscrew-like convolutions. When the 

 spiral filaments break up into motile fragments provided with flagella they 



FIG. 857. Cladothrix dichotoma; A, branching plant with wavy (a) or spiral (6) filaments; B, 

 spiral filament more highly magnified; C, long spirochsete-like filament; D, fragment with one 

 extremity spiral; E, spiral filaments segmenting into rods (7>) and cocci (c); F, spirocheete form, 

 a undivided, 6 dividing into long rods, c into short rods, d into cocci-like elements. (Zopf..) 



resemble genuine spirilla. According to Zopf, the so-called zoogloea rami- 

 gera is one form of development of Cladothrix dichotoma. 

 Biological Characters not determined. 



438. CLADOTHRIX FOERSTERI. 



Synonym. Streptothrix Foersteri (Cohn). 



Found by Grafe in the lachrymal ducts of the human eye. 



Morphology. Forms cocci-like masses, rods, and leptotiirix filaments, 

 which may be spirally curved. According to Zopf, this species closely re- 

 sembles Cladothrix dichotoma. 



Biological Characters not determined. 



