372 MR. LISTER ON THE STRUCTURE AND FUNCTIONS 



which adhered generally to one side of the tube, had the look of a slimy matter, in- 

 clining to granular, and held together by greater tenacity at its outside. Nothing 

 like muscular contraction was seen in the pulp of this or any other species. 

 . As a little globular animalcule was driving rapidly past one of the expanded polypi, 

 it instantaneously seized it, and brought it to its mouth by contracting its arms. 

 They gradually opened again, except one, that remained a while doubled, with its end 

 on the animalcule. The mouth indistinctly seemed filled with hairs or tentacula, 

 that closed over the prey; and after a few seconds it was carried slowly down, in the 

 manner of the Actinioe, the mouth contracting and the neck enlarging, into the 

 stomach : here it was uncertainly seen, and soon disappeared. Agitation of particles 

 in the stomach followed the swallowing, and then the currents between the stomach 

 and the branch went on again as usual. 



One polypus was supported on a stalk that, probably owing to injury, was entirely 

 empty of pulp ; yet it was still open and vigorbus. 



The minute and delicate species, Plate VIII. fig. 5, found at Brighton July 1833, 

 resembled Campanularia in having its cells placed on footstalks, and in the branch- 

 ing of its stem, but was differently jointed, and the cells and polypi were nearer to 

 Sertularia pluma. The polypi had sixteen arms. The currents, which generally 

 extended into the stomach of each, set more strongly into the side appendage, which 

 they all possessed, ending in two small ears, and looking like a continuation of the 

 footstalk. All the shell of the cells, when dry, gave the colours of thin plates, owing 

 to its extreme tenuity. 



The only ovary, a, in the specimen was enormously large compared with the cells, 

 depressed at the end, and transparent. It had an opake ovate substance within, of 

 a dirty yellow colour, that was connected with the base and with the extremity of 

 the ovary by a column of soft matter running nearly in the axis. Within this, be- 

 tween the base and the ovate body, currents were seen like those in the stem, and 

 sometimes a motion of particles was observed in the adhesion to the shell at h. No 

 separate ova, like those to be noticed in Campanularia, were .visible. 



Several species of Campanularice that were observed agreed very nearly in the 

 form of their bell-shaped cells ; with a distinct septum, and a thin column of soft 

 matter between it and the base of the cell. The branches also of all had annular 

 indentations round them, more or less numerous, which form a simple and beautiful 

 provision for giving flexibility combined with strength. 



The specimen figured in Plate IX., or that in Plate X. fig. 1, may equally serve, I 

 believe, as an example of Ser^tularia dichotoma, (taking that to be the name of Ellis's 

 species, pi. xii. a, c, C. and xxxviii. 3, B.) ; but the former of the two was much the 

 stouter in its growth. Its cells were from '018 to '02 inch in length, and the arms 

 of its polypi commonly thirty ; the other had about twenty-six arms and cells not 

 exceeding -014 inch. 



