LAMELLIBRANCHIATA. 
339 
Common on the back of the violet crab at Yougnal, Miss M. Ball. 
Dredged in Killery Bay, and found among oysters from the western 
coast, W. T. 
Birterbuy Bay, Mr. Barlee. 
Nov., 1839. Having taken quantities of this Modiola from Ascidice ,* 
and many within the last four weeks, I can state confidently that they 
were generally, and of all sizes, destitute of a byssus. The specimens I 
allude to were taken from very coriaceous Ascidice, in which they would 
of course less require to cast anchor than in those of a lighter and more 
tender substance. I remarked one individual, however, and with surprise, 
as having a rich yellow-coloured byssus. In masses of Botrylloides 
(large and small), on Halidrys siliquosa dredged from 5 fathoms ; Belfast 
Bay, April 3rd, 1848. 
M. vestita, Philippi. 
This Modiola is included in my Report on the Invertebrata of Ireland, 
but without any specific name being applied to it. A reference to the 
above work, as soon as it appeared, showed that the Irish shell is the M. 
vestita known to Philippi only as found on the shore at Malta. 
In a letter from Mr. Alder, written on the first of April, 1844, it was 
mentioned that among shells lately sent from the Mediterranean to Mr. 
King, Curator of the Newcastle Museum, were two specimens similar to 
the Irish shell : they “ were embedded in sponge, and one inch and a 
quarter respectively in length, and a little thicker from being older shells, 
but in all other respects the same.” In May last, I saw Modiolce of this 
species from the Mediterranean in Mr. Cuming’s unrivalled collection. 
The only Irish specimen of this shell yet known was procured, some 
years ago, at Youghal, by Miss M. Ball. 
It is described and figured in the second edition of Brown’s Illustra- 
tions, p. 132, pi. 37, fig. 36, under the name of Modiola Ballii. 
Genus Pinna. 
P. ingens , Mont. 
One 10 inches long and 5 broad found at Skerries, Rutty’s Nat. Hist. 
Dublin. “ A very fine specimen was found at Portrush, Co. of Antrim, 
by Mrs. Clewlow of Belfast.” Bantry Bay, Mr. Samuel Wright of Cork. 
Brown, Irish Test. “ Cove in Ireland,” Turt. C. D. To the Annals of 
Nat. Hist., vol. v. p. 13, I communicated the following note : 
Pinna fragilis, Turt. Brit. Biv. 
— papyracea — 
— pectin ata — 
• — muricata — 
The three first-named, together with P. ingens , noted in a letter to me 
from Mr. John D. Humphreys as found at Cove ; the two first and P. 
muricata by Dr. R. Ball, as obtained in the same locality (and at 
Youghal). Miss M. Ball informs me that P. ingens is very common on the 
* I find them in many species. Savigny has, in his Mem., made the same 
remark : all they seem to look for in the Ascidice is sufficient consistence ; yet I 
found one embedded in Ascidia orbicularis , Muller. I also find them, as Flem- 
ming has somewhere (Edin. Phil. Jour., April, 1823, p. 301) remarked, in Bo- 
tryllus Schlosseri I obtained at Lambay island. 
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