358 Mr. A. Hancock on new Species 
i Ascidia robusta, Hancock. 
: Body elongated, irregularly ovate, produced in front, very 
coarse, with a tinge of red, particularly towards the apertures; 
adhering by the whole side; but sometimes much distorted, 
and with adherent root-like prolongations. Apertures tubular, 
much produced, the branchial one terminal, the anal more 
than halfway down and inclining backwards; ocelli red. 
Test extremely thick, tough, hard, and cartilaginous, usually 
with root-like prolongations, semitransparent, very coarsé and 
rough, irregularly furrowed and pitted, and frequently much 
overgrown with zoophytes. Mantle tinged with red, deepened 
towards the apertures; tubes long, the anal one much pro- 
duced and turned backwards.  Tentacular filaments rather 
slender, not crowded, alternately large and small. Branchial 
sac extending a little behind the visceral mass, minutely pli- 
cated, with well-developed papilla, alternately large and small. 
entral plait transversely and strongly pectinated near the 
mouth. Length 4 or 5 inches. 
Several of this large coarse species were obtained, in 1865, 
at the island of Herm, during spring-tides, by the Rev. A. M 
Norman. They were mostly so firmly inserted amidst the 
roots of Laminaria digitata, that they were with difficulty re- 
moved. It is closely related to A. mentula and A. rubicunda ; 
the extreme hardness and thickness of the test, however, and 
the great length of the respiratory tubes, sufticiently distin- 
guish it from both. From the former it is likewise distin- 
guished by its colour and other minor characters. 
Ascidia mollis, Alder & Hancock. 
. Body ovate, lobated, of a rosy flesh-colour, attached by a 
limited portion of the side. Branchial aperture terminal; anal 
from half to two-thirds down, rather inconspicuous. 
thick, semitransparent, smooth and soft to the touch, rather 
shining, obtusely lobed, of a rosy flesh-colour, showing minute 
punctures and veinings of crimson. Mantle rather large in 
proportion to the test, of a pale flesh-colour, with a few rosy 
streaks ; the apertures crimson. Tentacular filaments nume- 
paratively slender intermediate ones. Ventral plait very 
. Three or four specimens of this distinct species were dredged 
in 1865, in Bertraghbuy Bay, Connemara, Ireland, by Mr. G. 
S. Brady. And we have recently examined two more speci- 
