SOME OBSERVATIONS ON ACINETARIA. 643 
drop makes its appearance on the free apical surface. The 
cytoplasm of the vermiform individual may be crowded 'with the 
nematocysts and “Tinctin-kérper” which have been previously 
mentioned in the account of the proboscidiform individual. 
The macronucleus is usually a more or less dumbbell-shaped 
structure lying generally rather to one side in the posterior 
half of the animal. 
The vermiform individuals of Ophryodendron sertu- 
larie and Ophryodendron multicapitatum (vide 
Saville Kent, p. 855) closely resemble in shape and move- 
TEXxT-FIGURE 2 a.—Oblique longitudinal section through the 
basal portion of a vermiform individual of Ophryodendron 
abietinum, showing the stalk (St), macronucleus (Ma), and 
long vacuole (Va). (2 Searcher, comp. oc.+2 mm. apochro- 
mat.) 
2 b.—Transverse section through a yermiform individual, 
showing macronucleus (Ma), and vacuole (Va). (6 comp. oc.+ 
2 mm. apochromat.) 
ments the vermiform individuals of Ophryodendron abie- 
tinum, from which the vermiform individual of O. sertu- 
lariz only differs in the fact that the internal end of the 
stalk may end in short hooks (vide Robin). 
The vermiform individual of Ophryodendron trina- 
cria seems, however, in the case of the few individuals which 
I examined, to possess a rather peculiar method of movement, 
by which the animal becomes contracted into a short spiral, 
and then slowly elongated again. 
There is one curious feature in Milne’s account of the 
vermiform individual of O. trinacria, the presence of a 
series of “sete or cilia” at the anterior end of the vermi- 
VOL, 53, PART 3.—NEW SERIES. 4+ 
