512 



PROTOZOOLOGY 



flask-shaped; more or less extensible, with drawn-out anterior 

 end; without rinp;-furrow which n)arks 'head' of Lacrijmaria, and 

 when contracted pellicular striae not spiral and no neck as is the 

 case with Chaenea; salt water. Many species. 



T. phoenicopterus Cohn (Fig. 235, d, e). Elongate; extensible 

 and contractile; neck and tail distinct when contracted; cyto- 



FiG. 235. a, Rhopalophrya salma, X870 (Kirby); b, Ileonema dispar, 

 Xl60 (Stokes); c, /. ciliata, X670 (Roux); d, e, Trachelocerca phaeni- 

 copteriis (d, XlOO; e, anterior end, X220) (Kahl); f, g, T. suhviridis 

 (f, X130; g, nucleus, X400) (Noland); h, Parachaenia myae, X670 

 (Kofoid and Bush). 



stome at anterior end, surrounded by a ridge containing indis- 

 tinctly visible short trichocysts; cytopharynx with trichocysts; 

 macronuclei made up of 4 radially arranged endosomes suspended 

 in nucleoplasm (Gruber, Kahl); micronucleus difficult to make 

 out; contractile vacuoles apparently in chain, rarely seen; salt 

 water; Woods Hole (Calkins). 



T. suhviridis Sauerbrey (Fig. 235,/, g). Highly extensible and 

 contractile; nucleus contains pecvdiar crystal-like bodies; size 



