GENUS COTHURNI A. 723 



truding for half their length beyond the aperture of the lorica. Length of 

 lorica 1-450". HAB. Fresh water, on Confervas. 



Cothurnia elongata, From. 



Lorica subcylindrical, slightly widest posteriorly, twice as long as broad, 

 rugose or granular, colour yellow ; pedicle exceedingly short, inconspicuous. 

 Animalcule elongate, subcylindrical, possessing two contractile vesicles, both 

 of which are situated towards the centre of the body, in the rear of the 

 pharyngeal cleft, not protruding far beyond the aperture of the lorica. 

 Length of lorica 1-400". HAB. Fresh water. 



The two contractile vesicles reported by De Fromentel,* if persistent though 

 their number and position indicated is so abnormal that the author is inclined to 

 regard them as simple parenchymal vacuoles distinguish this form in a marked 

 manner from all the ordinary members of the Vaginicolina. A more important and 

 reliable character of distinction is, perhaps, aiforded by the granular consistence of 

 the lorica. 



Cothurnia spissa, From. 



Lorica tumbler-shaped, slightly narrower and rounded posteriorly, the 

 anterior margin nearly as wide as the lorica is long, the sides straight, not 

 everted at the anterior margin ; pedicle short and stout ; animalcule vase- 

 shaped ; the peristomal region much constricted, not protruding when 

 extended beyond the margin of the lorica. Length of lorica 1-400". 



HAB. Fresh water, on Conferva. 



The lorica in this species closely resembles that of C. patula, but may be dis- 

 tinguished from that variety by its straight lateral borders, as also by the small 

 capacity of extension possessed by the contained animalcule. 



Cothurnia irregularis, S. K. 



Lorica transparent, subcylindrical, one and a half times as long as 

 broad, the anterior margin not everted, the posterior region slightly inflated, 

 irregularly notched ; pedicle curved, produced a short distance within the 

 lorica ; animalcule obconical, narrowest posteriorly, very wide at the 

 anterior margin, protruding when extended but little beyond the aperture 

 of the lorica. Length 1-450". HAB. Fresh water. 



This form in no way agreeing with the C. nodosa of Claparede and Lachmann, to 

 which De Fromentel has with doubt referred it, it has become incumbent on the 

 author to propose a new specific title for its distinction. 



Cothurnia Cohnii, S. K. PL. XL. FIG. 22. 



Lorica elongate-ovate, subcylindrical, about three times as long as 

 broad, rounded and inflated posteriorly, narrowest and attenuate towards 

 the anterior extremity, the frontal margin abruptly truncate, the aperture 

 circular, the posterior third ornamented with four or five conspicuous 

 annular furrows, the remaining portion perfectly smooth ; pedicle short 

 and stout, not exceeding one-quarter the length of the lorica; enclosed 

 * ' Etudes sur les Microzoaires,' 1876. 



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