604 
Proceedings of the Royal Society 
sentatives generally met with between tide-marks. Aplidiumfallax 
occurs occasionally in masses fully an inch across. On touching 
living specimens, the large aperture in the common test leading into 
the internal cavity was sharply contracted. A group of curious ani- 
mals {Amouroucium f), elevated on long, clavate, hyaline peduncles, 
and arranged round a common centre, were also got under a stone. 
The truncated tips of the masses were carunculated, and the polyps 
of a bright orange hue during life. Numerous specimens of several 
species of bright orange and reddish orange Leptoclini abounded on 
the stones and fuci; and both Botryllus and Botrylloides were well 
represented, many having tadpoles in their masses. A curious thin, 
greyish-brown species, and a bright ochre-yellow one, occurred at 
the extreme verge of low water, both having glistening (as if var- 
nished) surfaces, covered with soft spiniform papillae. A Clavelina 
(fig. 2) was got between tide-marks, of a clavated outline, and 
with a hyaline test. At the upper part of the animal a dull grey- 
ish, muddy mass capped the viscera; below this was a somewhat 
fusiform, flesh-coloured thorax, irregularly streaked with yellow 
lines ; a swollen bright reddish orange stomach succeeded, marked 
by regular yellow bands, which on both sides presented a similar 
appearance, viz,, two lateral lines corresponding with the curve of 
