on the Natural Group of 'Tunicata. — . 537 
Liver coating the stomach behind the right ovary, and running 
from the lower end of the body, as suspended, about half 
way up. It is divided into several granulated lobes, some 
of which are separated from the others, particularly towards 
the pharynx. 
Ovaries two, elongate, lobate, situated on each side of the body, 
and directed towards the anal orifice. Right ovary straight, 
claviform, lying close within the loop of the intestine. Left 
ovary larger and less lobate, but undulated and extending 
downwards behind the branchial vein. 
The body of this singular animal is kidney-shaped, suspended 
to a cylindrical pedicle, very narrow and very long. Both the 
body and pedicle are scabrose, or covered with a rough surface, 
which is formed by exceedingly short coarse hairs. The original 
colour I cannot ascertain ; but in spirits it is cinereous or dirty 
white, which may possibly be the true colour of the animal, as 
it is not unfrequently that of other Ascidie. ‘The external orifices 
are placed both on the same side of the body ; the branchial near 
the pedicle, and the anal near the opposite extremity, but both on 
the same line with the base of the pedicle: thereby differing from 
the Boltenia oviformis of Savigny, which has, as this naturalist 
says, the pedicle inserted, not precisely at the summit, but at its 
side. ‘These orifices are cleft in a cross of four rays, and are 
not very prominent. The entrance of the branchial cavity is 
provided with a circular range of tentacula, which are compo- 
site, or divided at the extremity into a number of minute slips, 
. or laciniæ of a regular form, which are attached to the edge of 
certain membranaceous folioles, into which the membrane form- 
ing the root as it were of the tentaculum, appears to branch. 
The dorsal sulcus very nearly resembles that of Ascidia momus, 
as figured by Savigny, Plate vi. fig. 1., except that the lateral 
cordons are not transversely striated. A 
e 
