174 Mr, W. Thompson's Additions to the Fauna of Ireland. 



Rissoa proxima, Alder MSS. {JH.vitrea of my Report). 



Mr. Alder having lately obtained what he considers the true 

 R. vitrea, Mont., separates this species from it by the name quoted. 

 I leave to him the description of R. proxima. The shell is found at 

 Magilligan (W. T.) ; Portmarnock (W. T) ; Bundoran (Mrs. Han- 

 cock) ; Bantry bay. 



Pleurotoma coarctata, Forbes, Ann. Nat. Hist. vol. v. p. 107. 

 pi. 2. f. 15. 



Several specimens were dredged on the south-west coast about 

 Bantry bay in 1846 by Mr. M' Andrew. 



Nucula decussata, Sowerby. 



Specimens of this large but not very distinctly marked Nucula 

 from the Dublin coast, have been for some time in my possession, 

 through the kindness of Mr. Warren and Dr. Farren — the latter 

 gentleman noted them as from the deep sea, Howth. 



Notes. 



The two following species, though hitherto unnoticed in the Irish 

 Catalogue, are separated from the preceding, which are strictly 

 indigenous, in consequence of the one being introduced, and the other 

 perhaps not found living in our seas. 



Testacellus Maugei, Ferussac. 



Professor Allman informs me that he has found several of this 

 species in a garden at Bandon (co. Cork), and has obtained it in one 

 of the greenhouses at the College Botanic Garden, Dublin : — in the 

 open ground here, it has been met with by Mr. Bain, foreman. It 

 has doubtless been introduced to both localities along with plants. 



Teredo malleolus, Turton, Brit. Bival. p. 255. pi. 2. f. 19. 



I found numbers of this comparatively small species together with 

 a few of T. navalis, Turt., in the timbers of a ship on her return to 

 Belfast from a foreign voyage in 1846. Portions of the timbers were 

 quite honeycombed by T. malleolus, so that the vessel had in con- 

 sequence to undergo great repair. Turton described the species from 

 specimens found in drifted timber at Torbay*. 



* He describes the shell as one-fourth of an inch in diameter. My spe- 

 cimens are only one-sixth of an inch, or 2 lines, and the largest borings 

 very little exceed that in diameter. In length, they extend to 2| inches, 

 and are both straight and diagonal. They generally exhibit only a very 

 thin whitish coating of testaceous matter, but in a few instances this is so 

 thick as to form a tube. The borings are as close together as possible in the 

 piece of plank (black birch ?) under examination, which is 2\ inches in 

 thickness. They are formed like those of the Xylophaga, against the grain 

 of the wood. The outer perforation is round or roundish, instead of being 

 " rather elongated," as described by Turton. 



