G AMATHIA. 
67 
TULIP-FORME Do 
1. Pasithea tulipifera . Articulations in the form 
of clubs ; cells three in number* united on one pedicle. 
—Plate 3. fig. 7. A. 
American seas* principally on the J amaica coast. 
FOUR-TOOTHED. 
2. Pasithea quadridentata • Rampant* cells ver- 
ticillated* four and four* with an odd one ; that in the 
centre frequently proliferous.— -Plate 3. fig. 8. a. B. 
On the fucus natans. 
AMATHIA. 
Branching Polypidom ; cells long and cylindri- 
cal, united in one or many groups. 
The Amathias, by their numerous cells* their horny 
and hollow stem* filled in a living state with a gelati- 
nous and irritable substance* show the general cha- 
racter of the Order ; they differ* however* from their 
neighbouring genera, by their aspect* their ramifica- 
tions, and also the form and respective situation of 
their cells. In some species the cells are united in 
isolated groups, resembling Pan’s flute with cylindri- 
cal reeds varying in their length ; in others all the 
groups touch* but can easily be distinguished by the 
unequal length of their cells : some of them have 
their polypous cavities united at the sides* forming 
spiral and projecting lines round the stems* to which 
