Royal Irish Academy, 



349 



son to believe had not before been noticed. He then exhibited spe- 

 cimens of 



1. Sepia officinalis, Dublin bay. 



2. Sepia Rupellaria} A dorsal plate, being one of three specimens 

 found by G. Hyndman, Esq., at Magilligan. See Ferussac and D'Or- 

 bigny's Cephalopoda, plate 3 of Sepia. 



3. Loligo sagittata. Leith. Obtained by W. Thompson, Esq., of 

 Belfast. 



4. Loligo sagittata, var. ? This was in the former paper consi- 

 dered as a variety, but on comparison with the true sagittata, No. 3, 

 it seems to be a distinct species. It was obtained by G. Allman, Esq., 

 on the coast of Cork. 



5. Loligo subulata, var. ? Was obtained by John Montgomery, 

 Esq. of Locust Lodge, on the coast of the county Down. 



6. Loligo subulata, var. No. 2. Somewhat shorter than No. 5. 

 Youghal, 1832. 



7. Loligo media. Youghal, 1819. 



8. Loligo media, var. It approaches the form of sagittata in the 

 termination of its visceral sac. 



9. Loligo Eblance. Of the former paper.. Obtained by T. W. 

 Warren, Esq., in 1836 ; and other specimens of greater beauty and 

 larger size obtained in the bays of Belfast and Dublin by W. Thomp- 

 son, Esq., and Mr. Ball. As it now appears that the animal pos- 

 sesses both eyelids and a lacrymal sinus, characters not ascribed to 

 the genus Loligo, it may require to be placed in another genus. 



10. Eledone ventricosa. Youghal, 1820, and Dublin. A very fine 

 specimen was found by Mrs. Lyle at Kingstown. 



11. Octopus vulgaris. Plymouth, 1841. Mr. Ball. 



12. Sepiola Rondeletii. Youghal, 1819. Dublin, 1829. Mr. Ball. 



13. Rossia Owenii. Was obtained in 1839 by Mr. Ball, from a 

 fishwoman who had found it in a Dublin bay fishing-boat. It is re- 

 markable for the great size and distinctness of its acetabula, which 

 are placed on long peduncles, and may be compared to the pearls in a 

 diadem : they are ranged in three rows, those of the centre row being 

 not more than half the diameter of those on each side ; on the first 

 pair of arms the acetabula are more numerous, more equal in size, 

 and smaller than on the others. The specific name has been given 

 in honour of R. Owen Esq., the founder of the genus Rossia. 



14. Rossia Jacobii. Was obtained from the same woman as the 

 foregoing, in 1840, by A. Jacob, Esq., M.D., who kindly sent it to 

 Mr. Ball. It is much larger, but differs considerably in its propor- 

 tions from Rossia Owenii ; its acetabula are smaller ; its arms propor- 

 tionably shorter ; the membrane round the mouth forms a hexagonal 

 figure from each angle, of which a ridge runs, which is decurrent in 

 six cases ; on the second, third, and fourth pair of arms, and in the 

 seventh the ridge passes upon the web between the first pair of arms, 

 where it bifurcates, and runs out on each side. Its specific name is 

 given in honour of Dr. Jacob, from whom Mr. Ball has in many in- 

 stances received kind and valuable aid in zoological pursuits. The fins 



