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 sordtda, and on the 

 valves of Psavimohta 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 serpens, Hassall; Hincks, Brit. H. Z. vol. i. p. 214. 

 Abundant on the stems oi Sertularia abietina and H.falcata 

 fi-om deep water. 



Fam. 6. Coppiniidse. 

 Genus CoppiNiA, Hassall. 

 C'oppim'a arcta, Dalyell ; Hincks, Brit. H. Z. vol. i. p. 218. 

 Common on the stems and branches of Sertularia abietina 

 and Hydrallviania falcata. 



Fam. 7. Haleciidae. 



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, I. c. p. 229, 

 pi. xliv. fig. 2), with, of course, the exception of the polyps. 

 In these cases the hydi-othecje 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 hydrothecaj are better 

 developed at the base of the stem, wliile 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. 22.3. 



This is the common Haleciuiu from the deep water of the 



