1884.] 



MICROSCOPICAL JOURNAL. 



123 



represents the animal- 

 cule magnified 170 di- 

 ameters. 



Ti'a ch elop h ylhi i7i ta - 

 chyblashini^ sp. nov. ^ 

 (Greek, tachyblastos : 

 sprouting quickly.) 



Body elongate, flat- 

 tened, flask-shape ^vhen 

 contracted, clavate 

 when extended, eight 

 to ten times as long as 

 broad ; neck slender, 

 equalling about one- 

 third of the length of the 

 entire body, the annu- 

 lar apical constriction 

 obtusel}^ rounded ; pha- 

 ryngeal passage indis- 

 tinct, narro'w, longi- 

 tudinally striate ; cutic- 

 ular s u r f a c e thinly 

 clothed with cilia which 

 vibrate somewhat inde- 

 pendently and irregu- 

 larly ; contractile vesi- 

 cle single, near the pos- 

 terior extremity, form- 

 ing quickly after systole 

 by the coalescence of 

 small vacuoles ; nuclei 

 two, spheroidal, sub- 

 central ; anal aperture 

 postero-terminal. Length of extend- 

 ed body y|^Y to o-^inch. Habitat. — 

 Among the decaying detritus at the 

 bottom of shallow^ pools. 



This little creature swims evenly 

 and smoothly, like the other members 

 of the genus, without revolving, but 

 rapidly and in a headlong way. Its 

 hasty movements were the cause of 

 an accident the result of which sug- 

 gested the specific name. A collision 

 occurred between it and a large Oxy- 

 tricha plaiy stoma ^ Ehr., followed 

 by a whirl and a dash that momenta- 

 rily carried both out of the field. In 



cyz^ 



New Fresh-water Infusoria.* 



less than a second the Trachelophyl- 

 lum was again under the lens, but it 

 seemed bewildei'ed, floating appa- 

 rently without effort, having con- 

 tracted itself. It was bleeding copi- 

 ously, for the whole apical constric- 

 tion and the entire pharyngeal tract 

 had been snapped off, and the endo- 

 plasm was streaming from the wound 

 in threads and globules and granular 

 particles. Almost immediately, how- 

 ever, the exudation of protoplasm 

 ceased ; in less than two minutes an- 

 other constricted apical ring was 

 formed, in less than fifteen minutes a 



* Explanation of Figures. 



c. v., contractile vesicle ; n., nucleus; ph., pharynx ; 



ir , trichocysts. 

 Fig. 1. Hynienostoma hyjiienophora, X 600. 

 Fig. 2. Trachelophylluvi vestilzitn, X 170. 

 Fig. 3. Trachelophyllutn tachyblastum , X 170. 

 Fig. 4. Litonotui pleurosigvia.. Left-hand side, X 180. 



Fig. 5. LitonoUis pleurosigma. Ventral aspect, X 180. 

 Fig. 6. " " In conjugation. 



Fig. 7. Petalomonas disoitiata. Ventral aspect, X 1,000. 

 Fig. 8. Litonotus helus. Ventral optical section, X 300. 

 Fig. 9. Petalomonas disomata. Transverse optical 

 section. Diagram. 



