360 MOLLUSCA. 



A. parallelogramma, Miill. 

 I 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 Avas attached to Algcs. 



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. echinata, 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 Zustera marina, in Strangford Lough. 



A. mammillaris, DeUa Chiaie. 

 Found attached to Laminaria dic/itata, &c., in Belfast and Strangford 

 Loughs. The spinous tubercles in my specimens ai'e not so regularly 

 disposed over the body as represented in Chiaie's work ; they are most 

 developed about the orifices. 



A. gcmina, Templeton. 



Mag. Nat. Hist., vii. p. 129. Entrance of Strangford Lough, adhering to 

 submerged rocks. 



A. tubidosa, 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. HjTidman 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 Laminarice., cbedged 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. \o, f. 3, as the young 

 state of Asc. rustica (pi'eviously 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 Hani. 



I have observed a few individuals of this species on the North-East 



