60 Proceedings of the Royal Physical Society. 



In conclusion, I beg to express my "best acknowledgments 

 to my friends Messrs Peach and Etheridge, for kind assistance 

 rendered to me in the identification of species. 



IV. Mr Peach exhibited drawings of twenty-six species of the 

 animals of mollnsks, dredged in 1864 by Mr Jeffreys off Shet- 

 land. He shortly commented on them, but more fully described 

 Stilifer Turtoiii, a pair having been got in deep water living 

 amongst the spines of Echinus neglectus of Forbes, on which 

 they had deposited about forty clusters of spawn. Large 

 drawings were shown of them and their spawn on the Echinus 

 and of the fry. Some of the ova were taken out of one of the 

 masses, from these they escaped and immediately whirled 

 about by the long cilia on the three lobes protruding from the 

 nautiloid shells they were contained in. They were very 

 much like the young of the Nudibranchise. Although this 

 interesting shell is far from common, it is pretty generally 

 found in our seas. He also mentioned Trochus helicinus for 

 its beauty, the animal having long, slender, flexible, and con- 

 tractile ciliated tentacles, six appendages on each side all 

 ciliated, its lobed mouth, two pairs of eyes, and minute, pretty 

 formed shell, as making it altogether a beautiful object for the 

 microscope. He added to the interest of the exhibition by 

 introducing two species of Dentaliuni like shells, both new to 

 the British seas, which Mr Jeffreys had dredged off Shetland, 

 viz., Siphonodentalium Lofotense and Cadulus subfusiforme. 

 Both were previously known in Norway. 



V. Mr Thomas Hope exhibited a female specimen of the 

 Iceland gull {Lams Islandicus), shot between Leith and Porto- 

 bello, on March 1, 1875. 



