= ra 
958 LIVERPOOL BIOLOGICAL SOCIETY. 
but short, unbranched and scattered over the rest of the 
surface (Pl. XIII., fig.4). There are a few small sparingly 
branched vessels with elongated slightly dilated ends 
(Pl. XIII, fig. 3, v.). The test in thin sections shows a 
clear slightly fibrillated matrix in which a few test cells are 
scattered. 
The Mantle is not adherent to the test except at the 
apertures. It is moderately thick. The interlacing muscle 
bands are slender, but numerous. On the left side of the 
body, over the viscera, they are very delicate. The siphons 
are rather large and muscular. 
The Branchial Sac has five folds on each side. They are 
all of the same size, and bear each three or four internal 
longitudinal bars on the surface. The stigmata are not 
very much curved, and in some places are quite straight 
(ells 2OUNL,. sree i, Gop)): 
The Dorsal Lanina is a plain, short, wide membrane 
with an irregular free edge. 
The Tentacles are eight large and eight smaller alter- 
nating, and a few very small ones placed irregularly. 
The Dorsal Tubercle has a simple circular or quadrangular 
opening (Pl. XIII., fig. 6, d. ¢.). 
A single specimen of this new species, which I name 
in honour of Albany Hancock, who was a distinguished 
investigator of the British Tunicata, was dredged from 
a depth of twenty fathoms, at about twenty miles 8.K. 
of the Isle of Man, in the ‘‘ Weathercock”’ expedition 
of September, 1886. It may have been attached by the 
matted fibres at the posterior end of the test. Most of the- 
adhering sand grains are behind the middle of the body. 
At first sight it seems as if there were no hair-like 
processes, and that the sand was attached directly to the 
test, but on scraping away some of the encrusting grains 
it is seen (see Pl. XIII., fig. 4) that a comparatively small 

