466 Mr. J. Macgillivray on Marine Zoophytes 



deep water in great abundance by the fishing-lines, the baits em- 

 ployed being greedily swallowed by the Actinia. Individuals of a 

 uniform bright scarlet colour are not unfrequently met with, but in 

 general the specimens I have seen are only irregularly blotched with 

 that colour upon a ground of dirty yellow. 



Actinia Dianthus. This " Actiniarum pulcherrima " I have met 

 with only twice, adhering to dead valves of Cypriiia Islandica, a fa- 

 vourite attachment of the precechng species. 



Crisia eburnea. On various corallines ; apparently not very com- 

 mon. 



C. luxata. Although one of the characteristics of this species is 

 the black colour of the internodes, these are no darker than the rest 

 of the polypidom in a specimen before me, in which I have in vain 

 looked for other distinctions. A common parasite upon Flustrafo- 

 liacea and many other corallines. 



C. ternata. One of Dr. Skene's discoveries, which does not seem 

 to have occurred since, except to Dr. Fleming, who well charac- 

 terized it from his Zetland specimens. Cells elongated, gradually 

 increasing in breadth towards the top, for the most part with a la- 

 teral projection ending above in a slightly acute angle ; aperture ter- 

 minal, large and oval, level with the surface, and furnished above with 

 from two to four short spines. Vesicles cylindrical, inversely conical, 

 arising from the tops of the cells, very sparingly produced. Nume- 

 rous very long tubular bodies arising from the cells, give the whole 

 polypidom a ver}' characteristic appearance. The joints are amber- 

 coloured, the remainder being white and pellucid. I have seen no 

 true opercula upon this species, although the persistent polype-sac 

 might be mistaken for such. 



Notamia loriculata. Very abundant. 



Tubulipora Patina. Usually attached to Plumidaria falcata and 

 Sertularia Abietina ; plentiful. 



T. serpens. Extremely abundant upon coraUines ; few specimens 

 oi Plumidaria falcata are without this parasite. 



Discopora hispida ? About two lines in diameter, calcareous, 

 white, subcircular, revoluted at the margin, which is free, the crust 

 being adherent at the centre only. The surface is closely studded 

 with vertical tubular cells of various lengths, which do not aj^pear to 

 be arranged in any definite order ; some are level with the surface, 

 while others project in a slightly inclined manner to a height of 

 twice their diameter. The longer cells are coalescent throughout, 

 the shorter at the base only. Such of the cells as are prominent 

 are obliquely truncated, with the apex bifid, or presenting two 

 sharp spines. Often there is but a single spine, sometimes an ad- 

 ditional smaller one arising lower down. The polypidom bears a 

 considerable resemblance to Tubulipora Patina, with which it is ge- 

 nerically associated by Dr. Fleming : while I say this, I of course 

 assume the specific identity of my specimen with Discopora hispida, 

 of which I am by no means certain. It may be observed that Dr. 

 Fleming gives as one of the characters of the genus Discopora, 

 " crust adhering in the middle ;" while the author of the ' History of 

 British Zoophytes ' mentions that the crust is " adherent through- 



