72 Ware 
of the shrub mentioned, together with the fact of the barren state 
of the adjoining shrubs, point to a general depression of power. 
As bearing on this, two conditions should be mentioned. The 
shrubs were isolated and far removed from others of their species, 
and probably therefore from the advantages of cross-fertilization. 
Then.a high hedge, backed by a growth of trees on the other side 
of the ditch, cut off the shrubs from the direct ray of the sun, 
except in the very early morning on the N.E. and late evening 
on the N.W. It should be noted also that the waste fruit that 
falls by reason of an excessive crop has the endocarp naturally 
developed. 
VEL. 
ON TRICHODINA AS AN ENDOPARASITE, 
BY 
T. B. ROSSELER, F.R.M.S. 
Read FEBRUARY 10, 1887. 
(Read before the Royal Microscopical Society, 138th October, 1886, and 
reprinted by permission of the Council). 
I was led to the discovery of this Infusorian as an endoparasite 
by a fortunate accident. Being anxious to find the habitat of an 
endoparasite I had observed attached to the muscles of the larva of 
Oorethra plumicornis, whose life-history I was working out, 
I selected the smooth water-newt as my subject, knowing from 
observation of its habits that the newt feeds largely on these and 
similar larve ; but whilst dragging for them, I captured some 
specimens of Zriton cristatus, which I therefore included in my 
investigations. 
Previous to experimenting with the larve it was necessary to 
ascertain what parasitic life the newt gave shelter to in its alimen- 
tary canal, so that in tracing out the life-history of the endoparasite 
of which the larva of Corethra is the host, the metamorphoses of 
one parasite might not be confounded with those of another. 
It was during the dissection of one of the newts so obtained 
that I observed in the fluid in which the viscera were placed, a 
species of TZrichodina, resembling, but not, I think, identical 
with 7. pediculus, which is so frequently found as an ectoparasite 
on Hydra vulgaris in company with Kerona polyporum. | The 
creature was .so named by Ehrenberg, a name which it still 
retains with English naturalists, although it is known to Con- 
tinental investigators under other names. Dujardin* places it 
as the second genus in his family of Urceolarieew, naming it 
Urceolaria stellina, but all writers agree in the'fact of its being 
ectoparasitic only, and free-smimming in its habits. Dujardin 
says, ‘‘ La face opposée garnie d’une couronne complete de cils, au 
* «Histoire Naturelle des Zoophytes,’ 1841, p. 527. 
