638 C. H. MARTIN. 
through. I have also examined Ophryodendron tri- 
nacria, which I found on a copepod (Tisbe) at Naples, and 
I am indebted to Mr. Grosvenor, of New College, Oxford, for 
some preparations of Ophryodendron multicapitatum 
from an Idotea found at Plymouth, with some notes on the 
living animal. 
The Ophryodendron were usually fixed with Flemming, which 
was washed out by H,O, in 70 per cent. alcohol, or in corro- 
sive acetic. ‘he whole preparations were stained either with 
alum carmine or by borax carmine, followed in some cases, 
according to Hertwig’s method, by picric acid. The last 
method was the only one by which the nematocysts could 
readily be demonstrated in whole preparations. 
The sections were stained with hematoxylin followed by 
eosin to show the structure of the proboscis and the nemato- 
cysts. 
General. 
For convenience sake I have decided to divide my observa- 
tions under the tollowing headings : 
(4) The structure of the proboscidiform individual. 
(5) The structure of the vermiform individual. 
(6) The feeding of the Ophryodendron, with notes on 
nematocysts in some other protozoa. 
(7) The external budding of Ophryodendron. 
(8) The ciliated buds. 
In the following pages, unless definite reference is made to 
another species, the observations deal with Ophryoden- 
dron abietinum (Clap. and Lach). 
4, THe SrructurRe oF THE PRoposcrpirorRM INDIVIDUAL. 
The Proboscidiform individual of Ophryodendron abie- 
tinum is roughly pyriform in shape, the basal portion of 
the animal in the neighbourhood of its attachment being small 
(Pl. 15, fig. 6). In a section at right angles to the longest 
axis of the animal it will be seen that the animal is much 
