198 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mar. 10, 



Mr. Sowerby described an allied species under the name of Cochlicopa 

 terebellum. 



The subfossil Succinea is of a very ordinary character, as is the 

 case with the majority of species of this genus all the world over, 

 though, curiously enough, one of the living St. Helena Succinece is 

 remarkable for its peculiarities. 



One of the Helices is most nearly related to Madeiran types. 

 Mr. Sowerby has described four species, H. bilamellata, H. polyodon, 

 H. spurca, and H. biplicata, in his note on Mr. Darwin's collection. 

 I have examined the first and third of these. 



1 have endeavoured elsewhere * to show that all the information we 

 possess respecting the marine mollusks of the coasts of St. Helena 

 would lead us to infer the very ancient isolation of that island, whilst 

 at the same time a pre-existing closer geographical relationship be- 

 tween the African and American continents than now maintains is 

 dimly indicated. The information we have obtained respecting the 

 extinct and existing terrestrial mollusks of this isolated fragment of 

 land would seem to point in the same direction, and assuredly to in- 

 dicate a closer geographical alliance between St. Helena and the west 

 coasts of South America than now holds. 



Descriptions of the New Species. 



BuLiMus Darvinianus, Plate V. fig. 1. 



Testa crassa, elongato-oblonga, fusiformis, subumbilicata ; anfractus 5, convexius- 

 culi, ad suturam crispati ; sutura impressa ; apertura oblonga, basi canaliculata 

 angulataque ; columella contorta ; faux supra columellaris plicata ; peristoma 

 continuum ; labrum intus incrassatum. Long. If unc, lat. Of unc. 



Found by Edward Alexander, Esq. 



BuLiMus Sealeianus. Plate V. fig. 3. 



Testa oblongo-pyramidata, crassa ; anfractus sex, convexiusculi, oblique striati, 

 ultimus maximus ; apertura oblongo-lenticularis, infra angulata ; peristoma con- 

 tinuum, incrassatum. Long. 0^^ unc, lat. 0^ unc. 



Found by Edward Alexander, Esq. 



BuLiMUS Blofeldi. Plate V. fig. 2. 



Testa tenuis, pyramidalis, ventricosa, Isevis, umbilicata; anfractus 5, tumidi, ulti- 

 mus maximus, ovatus ; apertura ovata, infra angulata ; labrum columellare rec- 

 tum ; peristoma disjunctum; margo tenuis. Long. 1^ unc, lat. 0^ unc. 



Found by J. H. Blofeld, Esq., F.G.S. 



Succinea Bensoniana. Plate V. fig. 7. 



Testa ovata ; spira brevis ; anfractus 3^, ultimus maximus, ventricosus ; apertura 

 ovato-rotundata. Long. 0-^ unc, lat. 0^% unc. 



Found by Edward Alexander, Esq. 



Helix Alexandri. Plate V. fig. 9. 



Testa orbicularis, depressa, convexiuscula ; anfractus septem, rotundati, forte 



* Rep. Brit. Assoc, for 1851. 



