1885.] 



MICKOSCOPICAL JOURNAL. 



125 



body, ^^ inch. Habitat. — Stagnant 

 pond water. 



This readily recognized form is 

 only the second fresh-water species 

 hitherto observ'ed, the first being L. 

 truncata^ which was obtained by the 

 writer in a habitat similar to that of 

 L. vertens. The body is very flex- 

 ible, insinuating itself with ease 

 among and between tangled threads 

 of fungi and heaps of debris. The 

 anterior extremity seems to be the 

 most extensile portion, the region 

 also retracting itself until the smooth 

 apical hemisphere, which is pierced 

 centrally by the oral aperture, is ap- 

 parently sunken and surrounded by a 

 deep circumvallation, the character- 

 istic constriction of the body then 

 being lost by the dilation of the part. 

 The movements are by rapid revolu- 

 tions on the longitudinal axis. 



Ldgynus Idsius, sp. nov. (Fig. 6.) 



Body normally flask-shaped, about 

 three times as long as wide, longi- 

 tudinally furrowed, the ventral surface 

 flattened ; contractile to an ovate form 

 and extensile until elongate-clavate 

 or subcylindrical ; anterior extremity 

 rounded, oral aperture terminal ; oral 

 cilia conspicuous, those of the general 

 surface long, numerovis, vibrating 

 somewhat irregularly and independ- 

 ently, and confined chiefly to the body 

 back of the anterior neck-like pro- 

 longation, the latter being rather 

 sparingly ciliate and bearing numer- 

 ous, immotile, hispid setae, a series 

 also continued down the dorsal sur- 

 face to near the posterior extremity ; 

 pharynx conspicuous, longitudinally 

 plicate ; nucleus subcentral ; contrac- 

 tile vesicle single, postero-terminal. 

 Length of body ^-^ inch. Habitat. — 

 Fresh water. 



A noteworthy feature of this little 

 bottle-shaped creature is that the neck 

 is abundantly clothed with short, stift' 

 bristles with a great decrease in the 

 number of the vibratile cilia, which in 

 equal abundance are borne on the re- 

 maining body surface. At first glance 

 the appearance of this roughened 

 neck is such as to lead the observer to 



at once imagine that the infusorian 

 has recently taken part in a fierce bat- 

 tle, and has had the anterior cilia 

 broken or in some way incompletely 

 removed ; but the perfect condition 

 of the oral circle, and the continua- 

 tion of a row of the seta? down the 

 median line of the dorsum show that 

 the condition is normal and the infuso- 

 rian vminjured. 



The movements vary with its form. 

 When flask-shaped progression is 

 evenly forward on the flattened ventral 

 surface ; when contracted to the broad 

 egg-shape, or extended to the sub- 

 cylindrical form, it rotates on its long 

 diameter. 



Cothurnia plectostyla^ sp. nov. 



(Fig. ;•) 



Lorica elongate-urceolate, two and 

 one-half times as long as broad, hya- 

 line, slightly compressed, inflated, 

 and somewhat gibbous subcentrally, 

 thence tapering posteriorly to the 

 pedicel and anteriorly to a short, sub- 

 cylindrical neck, the margin truncate, 

 not everted ; pedicel conspicuous, 

 transversely plicate, often sinuose, 

 continued through and filling the 

 tapering posterior extremity of the 

 lorica, and prolonged as a short inter- 

 nal footstalk which is entirely invag- 

 inated by the posterior extremity of 

 the conti"acted animalcule ; enclosed 

 zooid transversely striate, when ex- 

 tended pi'ojecting very slightly beyond 

 the orifice of the lorica ; nucleus 

 broadly ovate, conspicuous, subcen- 

 tral. Length of lorica ^^y inch. 

 Habitat. — Fresh water, on Cantho- 

 camptus tnimitus. 



This was very abundant on the 

 entomostracan mentioned, as were 

 what were supposed to be the imma- 

 ture pedicellate zooids which were 

 still without a trace of a lorica. The 

 pedicel of these was long, tortuous, 

 and conspicuously plicate, the ovoid 

 bodies also exhibiting transverse stri- 

 ations. The mature forms are readily 

 distinguished from allied species not 

 only by the shape of the lorica and 

 the very short distance to which the 

 body extends beyond the sheath, but 



