1884.] 



MICROSCOPICAL JOURNAL. 



123 



represents the animal- 

 cule magnified 170 di- 

 ameters. 



Trachclophylhd m ta- 

 c/iydlastum, sp. nov. 

 ( G reek . tachyhlastos : 

 sprouting quickly.) 



Body elongate, flat- 

 tened, flask-shape when 

 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 

 obtusely rounded ; pha- 

 rjngeal passage indis- 

 tinct, narrow, longi- 

 tudinally striate ; cutic- 

 ular surface 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 jT^^ 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- 

 trlcha pi aty stoma ^ Ehr., followed 

 by a whirl and a dash that momenta- 

 rily carried both out of the field. In 



'bS;.,;: 



New Fresh-watkr Infusoria.* 



I less than a second the Trachelophyl- 

 lum was again under the lens, but it 

 seemed bewildered, floating appa- 

 rently without eftbrt, having con- 

 tracted itself. It was bleeding copi- 

 ously, for the whole apical constric- 

 tion and the entire pharyngeal tract 

 had been snapped oiF. and the endo- 

 plasm was stream ini;- 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; «., nucleus; ph., pharynx; 



tr , trichocysts. 

 Fig. I. Hymenostotna hymenophora, X 600. 

 Fig. 2. Traehflophyllunt vestitum,y, 170. 

 Fig. 3. Trachelophyllum tachyblastutn, X 170. 

 Fig. 4. Litonotui pUurosig^na. Left-hand side, X 180. 



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

 Fig. 6. " " In conjugation. 



Fig. 7. Peta/omonas disomaia. Ventral aspect, X 1,000. 

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

 Fig. 9. Petalomonns dUomata. Transverse optical 

 section. Diagram. 



