60 VERMES. 
This portion B had separated on or about the 20th October ; there- 
fore 100 days had now elapsed. 
Although still more satisfied there were excretory rolls, three weeks 
later I introduced some mud into the vessel, though uncertain whether 
it was available in any shape. 
B continued augmenting, it was very vigorous when delineated for 
the last time with the newly generated part, on April 14.—Plate VII. 
fig. 14. 
After considerable agitation on April 50, B lost a portion then sepa- 
rating from the upper part, whereby it was greatly disfigured. The 
separating portions delineated May 3, as fig. 15. 
Minute fragments only remained, which were still surviving on the 
25th of June, fig. 16, but had disappeared on the 2d of July. 
Such is the history, as nearly as I could follow it, of the specimen 
represented. 
It had been obtained on the 2d of October, and the latest surviv- 
ance of a fragment was known to be on the 25th of June. 
Just about a year afterwards, namely, on the 5th of October, ano- 
ther specimen, broken into four portions, reached me, which had been 
taken the preceding evening, not far from the same place as the former. 
The largest portion was about six inches long, but it afterwards ex- 
tended to ten or eleven ; and I concluded that the specimen, if entire, 
must have been twice the dimensions of the other. 
As far as entire, it was the same in formation and in colour, grey 
above, the margin light, a portion of the edge of one of the parts reddish, 
as if from weather. The groove was conspicuous on the sides of the head, 
while the mouth, as a large slit, appeared in the under surface. 
The second largest portion ruptured in two while lifting it on the 
first day of acquisition, and another into several parts in the course of 
the same afternoon. 
The anterior division, which had extended ten or eleven inches, 
bending and curving with vigorous action, exhibited some undulatory 
motions, resembling those of the first specimen, and I entertained expec- 
tations of its survivance. 
