600 ORDER HETEROTRICHA. 



Folliculina stylifer, Str. Wright sp. Pl. XXIX. Figs. 19 and 20. 



Lobes of the peristome even, spatulate, about three times as long as 

 broad, the left-hand lobe bearing at its apical extremity a single, straight, 

 rigid, rod-like style, which equals in length the lobe to which it is attached, 

 and projects beyond and guards the aperture of the lorica when the 

 animalcule is contracted ; body of lorica usually concealed from view, the 

 exposed anterior portion straight, cylindrical, its margin even, not expanded. 



Hab. — Salt water. 



The anterior region of the lorica, with the projecting peristome, as here re- 

 produced, is alone depicted in Dr. Strethill Wright's delineation of this species. 

 The stylate appendage projecting from the left-hand peristome lobe, which acts as 

 efficiently as the valvular apparatus of FolUculavia ekgans in protecting the retracted 

 animalcule from intrusion from without, serves, notwithstanding our imperfect 

 knowledge of the remaining characteristics, to distinguish this type from all other 

 known representatives of the genus. 



FoUicuUna hirundo, S. K. Pl. XXIX. Fig. 39. 



Lorica flask-shaped, pale sea-green when young, dark bottle-green 

 when old ; attached posteriorly ; constricted centrally and again dilated 

 before narrowing off to form the short, circular, and slightly everted distal 

 aperture. Animalcule bottle-green ; peristomal lobes very long and narrow, 

 uniform in size, eight or ten times as long as broad, or equal in length when 

 extended to that of the entire body ; endoplast ovate, subcentral ; contractile 

 vesicle posteriorly located. Length of lorica 1-200". 



Hab. — Salt water : Channel Islands. 



This species was obtained by the author, at Guernsey, in the autumn of the year 

 1870 and on subsequent occasions, attached in some abundance to various marine 

 Polyzoa and seaweeds, the swallowtail-hke aspect presented by the peristomal 

 lobes when seen from the dorsal or ventral aspect in their fully extended state, 

 suggesting the title conferred upon it. The alternately constricted and inflated 

 anterior portion of the lorica of this species, in addition to the slender and attenuate 

 contour of the peristomal lobes, distinguishes it readily from the forms previously 

 described. The basis of attachment of the lorica in FoUicuUna hirundo occupies a 

 very small area of the surface, being limited entirely to the posterior region. 



Folliculina Boltoni, S. K. Pl. XXIX. Fig. 36. 



Lorica flask-shaped, attached laterally, transparent when young, chest- 

 nut-brown when old ; neck bent upwards, very short, its margin even, 

 circular, not everted. Animalcule transparent ; peristomal lobes rounded, 

 of unequal size, one of these, usually the left, attaining twice the dimen- 

 sions of the other. Length of lorica, 1-200". 



Hab. — Fresh water, on Anacharis and other aquatic plants. 



This species is named after its first discoverer, Mr. Thomas Bolton, to whom the 

 author is indebted for the opportunity of examining examples of this and many other 

 interesting infusorial fomis described in this volume. So far it would appear to be 

 the only representative of the genus Fo/UcuUna yet obtained in fresh water, and may 

 be otherwise distinguished from its several marine congeners by the unequal size of its 



