at TETT: ah GT om, 
of Simple Ascidians. 357 
A. rubro-tincta is a near ally to A. mentula, from which, - 
however, it is distinguished not only by its colour, but also 
by several points of detail. The test is thinner and less coarse 
than it is in that species ; and the tubes are more conspicuous, 
particularly the branchial one; the ventral plait, too, differs in 
some particulars, as well as the reproductive organs. 
e have seen only one individual of this somewhat critical 
species; it was taken between tide-marks at Guernsey, by 
the Rev. A. M. Norman, in 1865. 
Ascidia rubicunda, Hancock. 
taken abundantly by the same gentleman on the stems and 
roots of Halidrys siliquosa, and procured at extreme low tides 
at Portaferry, Strangford Lough, 1869. More recently we have 
ad a few specimens sent to us by Mr. A. G. More, of Dublin, 
who collected them in Bertraghbuy Bay, Connemara. 
A. rubicunda is related to A. mentula, on the one hand, and 
to A. robusta, to be immediately described, on the other, but 
is distinguished from both by many characters. It is always 
more extensively attached, and is more elongated and de- 
pressed than the former, from which it likewise differs in 
colour. From A. robusta it is also distinguished by its great 
brillianey of colour, as well as by its general form, its shorter 
tubes, and the less robust character of the test. 
