26 MARINE FAUNA OF ST. ANDREWS. 



Genus Cuspidella, Hincks. 

 Cuspidelhi /lumih's, Hunks, Brit. II. 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. 

 FileUum serpens, Hassall ; Hincks, Brit. II. Z. vol. i. p. 214. 

 Abundant on the stems of Serf ularia abietina and Il.falcata 

 from deep water. 



Fain. 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 Hydrallman in falcata. 



Fam. 7. Haleciids. 



Genus Halecium, Oken. 



Halecium halecinum, L. ; Hincks, Brit. II. 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 77. sessile (Hincks, I. e. p. 229, 

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

 In these cases the hydrothcese do not seem to be fully developed; 

 but they show the row of dots below the margin. Specimens 

 an also seen in which one or two of the hydrothecae are better 

 developed at the base of the stem, while all the test 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 brandies 

 are not in the same plane. Some are slightly ringed. 



Halecium muricatum, Ellis and Solander; Hincks, Brit. II. Z. 

 vol. i. p. 223. 

 This is the common Halecium from the deep water of the 



