202 CATALOGUE OF THE MOLLUSCA 
attached through its whole length by a rather inconspicuous dise. 
Branchial aperture not quite terminal, at the anterior end, pa- 
pillose, very little elevated, and divided into eight tubercular seg- 
ments. Anal aperture situated a little below the branchial one 
on the left side, not prominent, with six tubercles. Outer tunic 
tough, sub-opake, nearly smooth but rather coarse ; inner tunic 
opake white or flesh-coloured with a few spots of red between 
the apertures. The red ocelli of the apertures, which are scarce- 
ly visible outside, are distinct in the inner tunic. Branchial 
sac reticulated, with slender papille at the intersections of the 
larger meshes. Length three-quarters of an inch; breadth 
about one-third less. 
Attached to the underside of stones, within tide-marks, Culler- 
coats, not common.—aA. HZ. 
Professor E. Forbes has referred our drawings of this species 
to Ascidia prunum of Miller, but in this opinion we cannot 
agree. A. prunum is described as rounded, lax, hyaline, and very 
pellucid, and is a free or slightly attached species dwelling in mud. 
It consequently does not belong to this division of the genus. 
8. A. peLLuorpA, Ald. and Hane. 
Body depressed, hyaline, subtriangular, attached laterally by a 
broad disc. Branchial aperture terminal, wide and tubular, divided 
into eight segments with red ocelli. Anal aperture situated a 
little below it on the left side, tubular and curved inwards 
towards the upper surface, with six ocellated segments. Outer 
tunic smooth, coriaceous, colourless and perfectly transparent. 
Inner tunic not above one-half the size of the outer one, opake 
yellowish white, inclined to red on the lower part. Length half 
an inch. 
Under stones within tide-marks, Cullercoats, rare,—A. H. 
OrpEer.—(Lxs Ascrprus socraLes, Milne Hdwards.) 
Famity. CLAVELLINIDZ, Forbes. 
126. CLAVELLINA, Savigny. 
1. C. pepapiFormis, Jill. 
Clavellina lepadiformis, Forb. and Hanl. Brit. Moll. i. 26, t. 
EH, f. 1. 
