420 INFUSORIA. 
lari only in the diminished development of their vibratile or- 
gans(1). The 
VacinicoLta, Lam. 
Seem to be Trichocerce with a diaphanous envelope; but we may 
be allowed to fear there has been some optical illusion(2). 
Tupicotaria, Lam. 
The Tubicolarie only differ from the Furculariz, by secreting 
themselves in little tubes which they construct of foreign molecules, 
but which do not form any portion of their body, like those of the 
Coralliferi (polypiers). Their rotatory organ however shows itself 
out of the tube, nearly in the manner of the head of Polypi. 
There is a species in France common on the Conferve of 
the marshes—Vorticella tetrapetala, Blumenb.; Dutrochet, Ann. 
du Mus., XIX, xviii, 1—10—whose rotatory organ is divided 
into four lobes. 
Bracuionus, Mull. 
The Brachioni, with rotatory organs and a tail nearly similar to 
those of the Furculariz, have a sort of membranous or squamous 
shield, which covers their back like that of certain Monocuili. 
y 
ORDER II. 
HOMOGENEA. 
The body of the Homogenea presents neither viscera nor 
(1) Trichoda paxillum, Miill., XXIX, 9—12; Encyc., XV, 1S, 20;—TZrich. lon- 
gicauda, Miill., XXXI, 10. 
(3) Trich. innata;—Tr. ingenitas—T'r. inquilina, M li. 
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