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 Ascidi<^* 

 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 Ascidics, 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 JBotrylhndes 

 (large and small), on Hcdidrys siliquosa dredged from 5 fathoms ; Belfast 

 Bay, April 3rd, 1848. 



J/, 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 31. 

 vestita known to Philippi only as found on the shore at Malta. 



In a letter from 'Sir. 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 3iodioJce of this 

 species from the Mediterranean in Mr. Cuming's unrivalled collection. 

 The only Irish specimen of this shell yet knoAvn 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 3Iodiola 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," Tuit. C. D. To the Annals of 

 Nat. Hist., vol. v. p. 13, I communicated the following note : 



Pinna frayilis, Turt. Brit. Biv. 



— fopyyacea — 



— pectitiata — 

 - — 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. li. 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, hi his Mem., made the same 

 remark : all they seem to look for in the Ascidiw is sufficient consistence ; yet I 

 found one embedded in Ascidia orbindaris, Mullcr. I also find them, as Flem- 

 ming has somewhere (Edin. Phil. .lour., April, 1^23, p. 301) remarked, in Bo- 

 tryllus Schlosseri I obtained at Lambay island. 



