26 
MARINE FAUNA OF ST. ANDREWS. 
Genus Cuspidella, Hincks. 
Cuspidella humilis , Hincks, Brit. H. Z. vol. i. p. 209. 
Not uncommon on the tests of Ascidia sordida , and on the 
valves of Psammobia and other shells, from deep water. The 
tests of Ascidians are the seat of a reticulated growth with 
numerous minute club-shaped processes risingfrom the creeping 
stem which is associated with C. humilis. 
Genus Filellum, Hincks. 
Filellum serjpens, Hassall; Hincks, Brit. H. Z. vol. i. p. 214. 
Abundant on the stems of Sertularia dbietina and H. falcata 
from deep water. 
Fam. 6. Coppiniidae. 
Genus Coppinia, Hassall. 
Coppinia arcta , Dalyell; Hincks, Brit. H. Z. vol. i. p. 218. 
Common on the stems and branches of Sertularia abietina 
and Hy dr allmania falcata. 
Fam. 7. Haleciidas. 
Genus Halecium, Oken. 
Halecium halecinum , L.; Hincks, Brit. H. Z. vol. i. p. 221. 
Plentiful in deep water, though somewhat less common than 
the next species. Young specimens under an inch in height 
sometimes occur, which in spirit quite agree with the Rev. A. 
M. Norman’s description of H. sessile (Hincks, l. c. p. 229, 
pi. xliv. fig. 2), with, of course, the exception of the polyps. 
In these cases the hydrothecse do not seem to be fully developed; 
but they show the row of dots below the margin. Specimens 
are also seen in which one or two of the hydrothecae are better 
developed at the base of the stem, while all the rest are in the 
condition described by Mr. Norman. It would appear to be 
doubtful if the mere elongation of the polyps would constitute 
specific distinction, any more than the fact that the branches 
are not in the same plane. Some are slightly ringed. 
Halecium muricatum , Ellis and Solander; Hincks, Brit. H. Z. 
vol. i. p. 223. 
This is the common Halecium from the deep water of the 
