356 Mr. A. Hancock on new Species 
. papilla, and the character of the vascular ramifications of the 
test. 
Ascidia Alderi, Hancock. 
Body irregular ovate or pyriform, produced towards the 
upper end, of a yellow colour, inclining to flesh-tint, with a 
few small scattered tubercles, attached diagonally by the base, 
and about halfway up the side. Apertures produced, distant, 
with longitudinal tuberculated ridges; the branchial aperture 
terminal; the anal about two-thirds down the body, and in- 
elining towards the left side; ocelli red. Test moderately 
thick, firm, transparent, with the terminal twigs of the blood- 
channels na ates at the surface of a crimson colour, much 
enlarged and widely fusiform. Mantle rather delicate, with 
the apertures well produced. Tentacular filaments slender, 
distant, not numerous. Branchial sac minutely plicated, nar- 
rower than the visceral mass, with papille at the intersections 
of the meshes, and smaller ones on the bars between them, all 
having on each side a tubercular swelling. Ventral plait 
MT ribbed and pectinated. Length upwards of two 
inches. 
We are indebted to the Rev. A. M. Norman for the acquisi- 
tion of this interesting species. Only one specimen was ob- 
tained; it was found between tide-marks at Herm, in 1865., 
A. Alderi is distinguished from A. plana, to which it 1s 
closely related, by the arrangement of the tentacular filaments, 
the form of the branchial papilla, by the colour and pecu- 
liar character of the blood-channels of the test, and by several 
other minor features. This species is dedicated to the memory 
of my late coadjutor. I do this, with great satisfaction, at the 
request of its discoverer, the Rev. A. M. Norman.: 
Ascidia rubro-tincta, Hancock. 
than halfway down the side: ocelli red. Test rather thin, 
cartilaginous, evum of a reddish flesh-colour, smooth, 
ed longitudinally. Mantle rather delicate, 
