390 MR. R. B. WATSON ON MADEIRAN MOLLUSKS. [Mar. 18. 



sea species obtained by him in the ' Porcupine ' dredgings in the 

 North Atlantic and Mediterranean. I have accordingly accepted the 

 excellent name which he had already attached to his undescribcd 

 specimens. It seems to be the only new species I have found here 

 which has yet been met with in these deep-sea dredgings. 



Its connexion with R. coriacea, Manzoni, is obvious and interest- 

 ing. The whole texture of the shells, from their embryonic state 

 onwards, indicates that whatever the place ultimately assigned to the 

 one, must be shared by the other. Manzoni suggests Odostomia as 

 its possible genus ; but the untwisted or regular apex negatives that 

 idea. Until something is known of the animal, the species may well 

 remain among the Rissoa:. To coin a new genus for it at present 

 would only be to multiply an evil which is already well-nigh un- 

 bearable. 



Barleeia rubra, Mont. 



I add this species on the authority of Manzoni, who, in his ' Me- 

 moire sur les Rissoa des iles Canaries et de Madere,' says he has 

 many specimens from Madeira. For myself, I have not met with it 

 here, and have serious doubts of its existence in Madeira. 



In addition to the above, the following species have presented 

 themselves. They may belong to the island ; therefore I enumerate 

 them ; but my specimens have, I think, been brought in ballast. 

 They are all dead shells, and were dredged in Funchal Bay. Now, 

 apart from the indigenous land- and freshwater-shells which, drifted 

 out to sea, not unfrequently turn up in the dredge, I have there 

 found, of land-shells quite certainly foreign, the following: — 

 Pisidium amnicum, P '. fontinale,\&r . henslowana, Neritinafluviatilis, 

 Bythinia tentaculata, Valval a piscinalis, V. cristata, Planorbis 

 albus, var. draparnaldi, P. complanatus, Limn<ea perayra, and Assi- 

 minea yrayana. 



Such a list makes me hesitate to accept the following for Madeira. 



Rissoa montagui, Payr. 



One young specimen. 



This is a fossil species of the Upper Tertiary and a living Mediter- 

 ranean species, which, beyond the Straits of Gibraltar extends {fide 

 M'Andrew) northwards as far at least as Cape S. Maria, the southern 

 point of Portugal. South of the Straits it seems unknown. 



Bissoa inconspicua, Alder. 



One specimen. 



An Upper-Tertiary fossil, and living {fide Jeffreys) from Norway 

 to the Canaries, including the Baltic and the Mediterranean. My 

 solitary specimen is young and fresh. It may prove to belong to 

 Madeira ; but the species in itself seems to me too questionable to 

 be of much interest, save as a variety of that hopeless polymorphic 

 group which includes half a dozen British and endless foreign 

 species. 



