730 ORDER PERITRICHA. 



total length ; animalcule subcylindrical, projecting but little beyond the 

 orifice of the lorica ; fleshy operculum thick and tumid, enclosing, in common 

 with the body sarcode, numerous refringent corpuscles. Length of lorica 

 1-500". HAB. Pond water. 



This remarkable type was obtained by the author in June 1880 attached to leaves 

 of Myriophyllum taken from the lake in Kew Gardens. The singular swelling 

 beneath the peristome which occupies the place of the horny operculum in Pyxicola, 

 and acts as effectually as a cork or plug to bar the aperture of the lorica from intru- 

 sion when the animalcule is retracted, may be appropriately compared to that 

 abnormally swollen condition of the human throat known as goitre. Excepting for 

 its perfect transparency, the lorica of this species corresponds essentially in both size 

 and contour with that of Pyxicola pusilla. 



GENUS XVII. STYLOCOLA, De Fromentel. 



Loricae and enclosed animalcules as in Vaginicola, but the zooids 

 attached to the bottom of their loricae through the medium of numerous 

 stylate processes. 



Two representatives of this genus only have so far been recorded, both of which 

 inhabit fresh water. It is desirable that the nature of the posterior attachment of 

 the animalcules to their loricse should be further investigated, as the brief description 

 and figures given by De Fromentel,* leave room for a doubt whether or not these so- 

 called stylate processes may not prove to be the longitudinal striation of an internal 

 pedicle, or the rays of an adhesive organ as in Spirochona, Should De Fromentel's 

 interpretation prove correct, the posterior stylate appendages would appear to 

 correspond with the posterior setae of Astylozoon rather than with the short pedicle 

 of many ordinary Vaginicolince. 



Stylocola striata, From. PL. XL. FIG. 2. 



Lorica short, vase-shaped, the breadth almost equalling the length, 

 slightly inflated posteriorly, the anterior margin slightly everted, united 

 with its basis of support by a boss or button-like protuberance ; animalcule 

 attenuate, cylindrical, very elastic, protruding when expanded beyond the 

 margin of the lorica to a distance equal to one-half of its total length, 

 attached to the bottom of the lorica by a fan-shaped expansion of numerous 

 long, stout, stylate processes ; the cuticular surface coarsely striate trans- 

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



Stylocola ampulla, From. 



Lorica transparent, sessile, subcylindrical, attenuate, rather over twice 

 as long as broad, slightly inflated posteriorly, contracted towards the 

 anterior end ; animalcule cylindrical, attached to the bottom of the lorica 

 by a few short, stout, stylate processes, not protruding far beyond the 

 aperture of the lorica ; surface smooth. Length of lorica 1-400". 



HAB. Fresh water. 



* ' Etudes sur les Microzoaires,' 1876. 



