454, BE, A. ANDREWS. 
digestive tract bifurcates to furnish an arm to each terminal 
with an anus at the tip of the ventral and, presumably, one at 
the tip of the dorsal when the tip was present, the nerve-cord 
does not bifurcate. 
The nerve-cord of the trunk runs down to the anus as what 
seems to be, judging from its histological appearance, a new 
nerve-cord along the median ventral line of the ventral terminal. 
The nerve-cord of the dorsal terminal ends abruptly where the 
ventral surface is continuous with the dorsal surface of the 
other terminal. It has no connection, so far as discovered, 
with the main nerve-cord. 
The sections also show that Y was a female with ovaries 
both in the trunk and in each terminal ; the ovaries are as yet 
only small masses of cells with large nuclei. , 
The last specimen, Z, was found amidst several hundred, 
August 6th. It differs from all the others in having the 
bifurcation far forward as a small lateral terminal upon the 
left, as seen in fig. 16. 
At rest upon the bottom of the aquarium the animal is 
straight or variously bent, generally so that the lateral process 
projects at acute or obtuse angles or at right angles with the 
straight or convex side of the body, rarely is the animal bent so 
that the process projects from a concave line. The curvature 
of the body may be uniform anterior to and posterior to the 
lateral process, or there may be a separate curvature on each 
side the region of the process; posterior to the process double 
curves, right and left, were observed. 
In swimming, the body is nearly straight and the process 
projects nearly at right angles. 
From the general coloration of the body, as indicated in 
fig. 16, the process makes an exception as regards the left or 
anterior side of its dorsal face. On this half the transverse 
colour bands are very imperfect, existing only upon the side 
between the parapodia and not extending up on to the dorsal 
surface. The posterior or right half has, however, the normal 
arrangement of bands. Along the lighter coloured left side 
there extends a clear streak, like a scar, reaching from near the 
