194 SUPPLEMENT. 



P. 171. — Dentalium bifissum belongs to the SolenoconcJiia, 

 and is the type of a genus which I have named Dischides ; it 

 is also fossil in the Italian tertiaries, and inhabits the Mediter- 

 ranean, as well as the Gulf of Gascony, the Straits of Gibral- 

 tar, and the sea-bed near Teneriffe ! 



P. 171. — T. navalis. E. Arcachon (Lafont)! Trieste 

 (Stossich) ! 



P. 174. — T. pedicellata. Arcachon (Fischer) ! ; Naples 

 (Tiberi and Acton) ! ; Zara, in the woodwork of the bathing- 

 machines, with T. Norvegica (J. G. J.); Algiers (Weinkauff)! 



P. 176. — T. megotara. Uist, Hebrides (M'Intosh) ! ; Ma- 

 deira (Watson) ! 



P. 181. — It does not appear that any of these occasional 

 visitants are alive when they reach our shores, much less that 

 they can thrive and propagate — which, indeed, is not desirable. 



P. 181. — T. malleolus. Arcachon (Fischer)!; Madeira 

 (Watson)! 



P. 182. — T.bipinnata. Hayle (Hockin ); Faroe I. (Morch). 



P. 184. — T. minima. If this be not the Mediterranean 

 species, what is it ? In some specimens the pallet-stalks are 

 very long, and the joints are not spinous at the sides. 



P. 185. — Solenoconchia. I overlooked the Rev. L. Guild- 

 ing's paper in the Transactions of the Linnean Society (xvii., 

 1834) entitled " Observations on Naticina and Dentalium., two 

 genera of Molluscous animals," which shows that he had as- 

 certained the true nature and organization of Dentalium. Its 

 habits, peculiar mode of locomotion, gills, numerous and elon- 

 gated tentacles with their suctorial extremities, vermicular 

 foot, and the position of the anal duct were most accurately 

 described by this excellent observer. The late Professor 

 Costa, in his * Fauna del regno di Napoli,' gave also some 

 details and elaborate figures of its anatomy, but mistook the 

 tentacles for branchial cirri ; he noticed the occurrence of 

 Foraminifera in its stomach. I would remark that the thread- 

 like and extensile organs by which the Solenoconchia seize 

 their prey are unlike the tentacles of any Gastropod, and their 

 function is quite different : captacula would be a more appro- 



