374 MR. LISTER ON THE STRUCTURE AND FUNCTIONS 



After being left for a night, the incomplete cell had grown, in twelve hours from its 

 beginning, to the appearance c 4. The soft matter of the branch was now wholly 

 detached from the shell on the left side, but lay close along it on the right : the 

 currents in that part were become scarcely perceptible, very slight dilatation and 

 shrinking being sometimes the only indications of them. The two tracings c 5 give 

 alternations in the soft matter of the cell three hours later : the striae indicative of 

 the forming process, smaller than those seen during the growth of the branch, still 

 remained near the end : when viewed as an opake object, the part /was a brownish 

 orange, and g milky. In a short time rudiments of arms appeared ; and c 6 repre- 

 sents them when the cell seemed completed after sixteen hours' growth : its end, 

 however, was closed, and the polypus, by slow motions backwards, forwards, and 

 sidewise, was releasing the yet imperfect arms from their adhesion to the side. The 

 tracings c 7 and c 8 show their continued progress. 



At twenty-six hours from the commencement of the cell the arms, apparently 

 fully formed and folded over each other, had been pressing against the end of the 

 shell, which seemed still to inclose them but had something of a ragged look, when 

 at length several were slowly raised beyond the cell. On their being drawn in again, 

 a little transparent film was seen projecting, the remains, as appeared, of what had 

 covered the end. The arms were then again protruded as at c 9. The stomach 

 enlarged and contracted, but seemed coated with an orange-coloured matter in irre- 

 gular masses. 



In one hour more the branch was terminated by a fine perfect polypus, fully ex- 

 panded, with twenty-eight arms, which was discharging at the mouth the opake 

 orange-coloured matter that had lined the stomach. 



The mouth, when open, varied from the form of a saucer to that of an upright 

 cup ; no hairs were detected within it. 



The pulp in the stalk had now many fresh adhesions to the shell on the left (c 9), 

 and must therefore have swollen since the tracing c 4, and contracted again. 



For some time after this the polypi of b and c continued expanded and, to appear- 

 ance, healthy ; but that of a, which on the first day gave proof of its vigour by 

 seizing and swallowing an animalcule, shrivelled greatly during the night, and was 

 found in the morning to be evidently in the course of absorption. A downward flow 

 from it of particles that were mostly small and a few orange-coloured, took place 

 every eight or ten minutes, continuing for three or four : the influx in the intervals 

 was scarcely or not at all visible. The progress and completion of this absorption 

 are shown in the tracings a2, aS, a 4, a 5. 



Another Campanularia, resembling the above, after being kept some days, though 

 fresh sea-water was often supplied gave the following symptoms of decay. The 

 polypi which remained were all contracted, with great agitation of particles in their 

 interior, and increase of the currents. Next, the continuity of the soft matter which 

 had connected them with the stem became broken, and no further motion was seen 



