360 MOLLUSCA, 
A. parallelogramma, Miill. 
X have taken this beautiful species (which is admirably represented in 
the work of Muller, Z. D. vol. ii. p. 11) on different occasions when 
dredging in Strangford Lough ; it was attached to Algce. 
A. canina, Miill. 
Strangford Lough ; Clew Bay (Co. Mayo), W. T. 
A. aspersa, Miill. 
Strangford Lough. 
A. scabra, Miill. 
As last. Possibly not distinct from it. 
A. ecliinata , Linn. 
Of this well-marked and pretty species, I obtained an individual para- 
sitic on one of the larger Ascidia dredged in Strangford Lough. 
A. orbicularis , Miill. 
Obtained on Zostera marina , in Strangford Lough. 
A. mammillaris, Della Chiaie. 
Found attached to Laminaria digitata , &c., in Belfast and Strangford 
Loughs. The spinous tubercles in my specimens are not so regularly 
disposed over the body as represented in Chiaie’s work ; they are most 
developed about the orifices. 
A. gemina, Templeton. 
Mag. Nat. Hist., vii. p. 129. Entrance of Strangford Lough, adhering to 
submerged rocks. 
A. tubulosa, Miill. 
One of this species, about twice the size of that represented in the 
Zoologia Danica, was dredged from pure sand, at about six fathoms’ 
depth, in Ballyhome Bay, Co. Down, in July, 1846 (Mr. Hyndman and 
"W. T). Professor E. Forbes, to whom the species was previously known, 
says that it is common in the Hebrides. 
A. grossularia , Van Beneden. 
This species, defined as having the “ test corne, presque lisse, de couleur 
rouge,” and being always known by its bright red colour, was found in 
abundance on oysters at Brightlingsea by its describer. What I consider 
to be the same species is likewise abundant on shells, stones, and occa- 
sionally on Laminar ice, dredged from a few fathoms’ depth, on the 
North-east coast of Ireland. It seems to me identical with what is repre- 
sented in the Zoologia Danica, vol. i. p. 15, t. 15, f. 3, as the young 
state of Asc. rustica (previously noticed by me in the Annals, vol. v. p. 
94). No allusion, however, is made by Van Beneden to the A . grossularia 
resembling any other Ascidia : but I agree with him in considering it a 
perfectly developed species, and consequently am of opinion that what 
Muller considered its adult state is another species. 
A. virginea, Forb. and Hanl. 
I have observed a few individuals of this species on the North-East 
