AMPHITRITE. 233 
functions of the branchix, physical and mechanical, may be combined in 
some manner unknown, notwithstanding the apparent design of Nature 
be frustrated in regard to the latter. 
It would be a problem of infinite curiosity and interest, investigat- 
ing the precise extent of the evolution of such a complication of organs 
as may subsist throughout the body. What are the spots,—where are 
the intervals by which they will be afforded ? Do their elements reside 
in each of the segments, or are they dispersed among a certain number of 
segments ? Can we obtain the materials allowing conjecture that many 
germs are ready to unfold similar generations when opportunity offers ? 
If the important privilege of reproducing what the animal employs 
for its own preservation subsists in many parts below, should we not infer 
that there may be some unknown means whereby a new tube can be con- 
structed, in order that the regeneration shall serve its original purpose ? 
After divulsion from the original site, the Amphitrite commonly 
fixes the extremity speedily again. But a fortnight elapsed before ad- 
hesion of that of the preceding specimen, mutilated of the fragment, 
possibly because the secretory organs had been lost along with it. In 
five weeks a slight sheath extended from the end of the tube along the 
glass. Its source may be probably sought in two terminal organs, doubt- 
less glandular below, besides which there must be much secretion from 
the rest of the body.—Figs. 10, 11, 0. 
During reproduction of an adult Amphitrite preserving its natural 
place, the disproportion between the renovating parts and the body is 
always diminishing ; that is, the dimensions of the body and the plume 
are approaching their mutual relation. But if there be no fallacy the 
reverse succeeds with a fragment. Here the disproportion is continually 
augmenting inversely. The body pines as the plume enlarges. The just 
proportion of a fine adult specimen in situ may be rated at the fourth of 
the length of the body, three inches, for example, if the latter be twelve. 
If half its length, the plume would be thought monstrous. But a new 
plume, generated from a fragment of the extremity, may become double 
the length of the body. The one pines as the other grows. Perhaps 
evolution of the lower parts of the animal depends chiefly on the func- 
26 
