Mr. Thompson on the Mollusca of Ireland. 99 



As one individual only has been obtained, I named it, 

 doubtfully as new, C. carinatum; but according to the better 

 judgment of Mr. Harvey, it is only a variety of C. reticulatum; 

 the shell was found by this gentleman at Miltown Malbay. 



Naiica. 



A shell belonging to this genus, obtained at Youghal by 

 Miss M. Ball, presents the following characters. It is in 

 length 12, in breadth 9 lines, of a tawny colour, withoat 

 bands or markings of any kind ; in form it is similar to JV. 

 Alderi, but is a larger species ; umbilicus divided by a spiral 

 ridge. 



To my friend Mr. E. Forbes, who has attentively studied 

 the British Naticce, I submitted this shell, but he had not 

 seen any like it. Until more specimens are examined, (more, 

 I understand, have been procured,) I am unwilling to desig- 

 nate it as a new species ; but should it prove to be so, I would 

 propose N.fulva as an appropriate name. 



The N. castanea, Lam., is stated by M. Reclus, who has 

 examined the original specimens, to be identical with N. 

 monilifera. Lam. t. viii. p. 625, 2nd edit. M. Deshayes 

 sets it down as the young of this species. Id. p. 639*. 



ECHINODERMATA. 



Ophiocoma Ballii, mihi. '^(TAM^^9^r. l^'J^.JT^-rtjMx^.^.?^^. 



Disk round or pentangular, covered with imbricated scales, two 

 diverging broadly wedge-shaped scales at the base of each ray. 



Largest specimen — disk 2^ lines broad, rays in length nearly 

 equal to four times its breadth ; rays above with fan-shaped scales, 

 beneath with rudely heart-shaped plates; spines four in each row, 

 rough, as long or longer than the breadth of ray. Colour pink. 



* In a MS. sent me by my friend Robert Templeton, Esq., Roy. Art., 

 before his departure for Ceylon, are the following descriptions of what he 

 considered to be two new species : 



♦• Nautilus pulchella, mihi. Size xV inch, opake white, exteriorly cre- 

 nated, becoming toothed towards the inner volutions ; chambers about 20, 

 marked externally by a depression, adjoining which the shell is minutely 

 tuberculated, or crenato-tuberculated. 



" Among some minute shells from Bangor, county Down, presented me by 

 Mr. G. C. Hyndman. 



Nautilus dentatus, mihi. Sizci^j inch, opake white, chambers of the last 

 whorl about 12, broad, crenato-tuberculate exteriorly, the margin toothed, 

 the teeth less acute towards the mouth. With last." 



