206 MOLLUSCA. 
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The stomach runs backward horizontally ; its fore-part 
had an inflated look when seen from the side, and, when 
from below, that of possessing two lateral lobes. The food 
after accumulating here was observed to be pressed onward 
to the hinder portion, leaving a narrow opake line of con- 
nexion with the oesophagus; the rest of the fore-part, of 
which the apparent volume was nearly as before, having an 
ochreous tint ; this was inferred to be the liver, enveloping 
the stomach above and on the sides, and accords with its 
place in other ascidiae and mollusca. The line is continu- 
ed by the intestinal canal that rises and then bends forward, 
taking the form of a reversed S, and terminates in an as- 
cending rectum and sphincter. The feces are considerable, 
as might be expected, where the food is taken with so little 
discrimination. Transparent vessels, that may be supposed 
lactaels, ramify along a part of the intestine and meet at a 
collection of globular bodies, from whence two flattish lobes 
‘extend backward ; in others these are wanting. From the 
meeting of the vessels two branches ran, one downwards 
and backwards, which was lost under the stomach, the other 
forwards ; and from the direction it took, I suppose it might 
communicate with a main stream of blood near the heart. 
Some individuals had not the projection above the vent 
observable in others. 
But the part that struck me as most remarkable in this 
creature was the circulation, of which a good view can be 
obtained through the transparent coat, for the particles of the 
blood are numerous, and, though not uniform in size or shape, 
are mostly between :00025 and -0002 inch in diameter, and 
approaching to globular. They are easily measured, as in 
the intervals between the spiracles, they pass mostly but one 
at a time. 
