Fulliculina holtorii (S. Kent). 3 if 



however, one of these individuals (fig. 7) allowed of more interest- 

 ing observations ; the lobes expanded, and the animalcule remained 

 three days in perfect health ; on the fourth, the peristome began 

 to be reabsorbed, the animalcule retracted into an ovoid shape, 

 lengthened into a ciliate vermiform larva, and swam away. On 

 the following morning I found the animal at rest, with a half- 

 expanded peristome and a relatively strong, thick shell, but 

 abnormally constructed and without any neck. It lived four days 

 more, with fully expanded lobes. This particular individual, we 

 must observe, had only been swimming for a relativel}^ short time, 

 less than one night, and had been very quick in its ultimate 

 transformation. This fact seems to corroborate the suppositions 

 already made with regard to the production of a new shell. 



Division. 



Sahrlage devotes a long chapter to the phenomena of division, 

 which he was able to study at length and on a good many indi- 

 viduals. My own observations are few, and in fact have concerned 

 but two specimens ; but whilst confirming in all important 

 particulars those of the German observer, they are such as to 

 necessitate a few lines at least on the subject. Of the two specimens 

 observed, one in fact counts for very little : the whole process of 

 the division had been effected during the night, and in the morning 

 I found, inside the primitive envelope, a normal individual, but 

 smaller than it was the day before, and in the neigbourhood a 

 vermiform ciliate, identical with those vermiform larvse which have 

 just been spoken of. The second specimen proved more interest- 

 ing. On the 23rd of December, at 9 a.m., I met with a Folliculina 

 (fig. 17) whose shell contained two individuals ; it was clearly a 

 case of division already terminated. One of them, the old one, still 

 affixed to the bottom of the shell, was of a somewhat cylindrical 

 shape, recurved, very pale, and already provided with a newly 

 formed peristome in* its early stage, without as yet any indication 

 of lobes. The other, the young one, much darker in colour and into 

 which most of the green matter seemed to have emigrated, was oval 

 in shape, and already bore at its anterior end the characteristic 

 crown of pectinellse. At 11.30, it left the shell, with the typical 

 form of the vermiform larva, and swam about rapidly the whole 

 afternoon ; on the 24th, at 6 a.m., it was still moving, though very 

 slowly ; at 9 a.m. it came to rest. On the 25th, at 9 a.m., the 

 animalcule was found provided with a shell, and expanded its 

 lobes ; and in this state it remained up to the 28th of the month, 

 but died on the 29th. The old one, which had been left in the old 

 shell, remained living till the 31st of December. 



