SOME ABNORMAL ANNELIDS. 453 
When the animal was alive the dorsal terminal stood nearly 
vertical and the ventral nearly horizontal while swimming, but 
in crawling the ends were inclined at about 45° to the horizon 
and so at right angles to each other. After death the dorsal 
terminal projects horizontally nearly in the line of the main 
trunk, while the ventral one now stands nearly at right angles 
to the rest. The ventral terminal is of some use in crawling, 
since its parapodia perform regular, rhythmic crawling move- 
ments. The dorsal terminal is of no use in crawling, as it is 
raised above the surface, yet its parapodia at times move, but 
in an irregular manner. The dorsal terminal may move back 
and forth to vary its angle with the trunk, and at times it 
makes undulating movements from side to side, as does the 
trunk, in swimming. 
The colour of the animal is normal ; the dorsal side of each 
terminal is marked by the normal transverse bands of dark. 
As the animal swims, the anterior face of the dorsal terminal 
and the posterior face of the ventral terminal, being the dorsal 
aspects, are dark brown, while the posterior face of the first 
and the anterior face of the second, being the ventral aspect, 
are light coloured. 
As the colour bands of the dorsal terminal are somewhat 
lighter than those of the ventral, it has a new or grey appearance 
which does not harmonise with the anatomical conditions found 
upon sectioning. 
When stimulated by the touch of a needle to the head, 
antenne, or cirri, the anterior region shrinks back. When the 
end of the ventral terminal is so stimulated there results a 
forward movement of the whole body, there may be even a 
rapid swimming away. Stimuli applied to the dorsal terminal 
cause local movement, but no change in the anterior region 
unless the stimulus is strong, when the animal may crawl, but 
not swim. It thus appears that the dorsal terminal is not as 
perfect a medium for transmitting stimuli to the entire animal 
as is the ventral. 
Examination of the internal anatomy shows the same con- 
dition of affairs found in A, as seen in fig. 12, While the 
