116 
ST. HELENA. 
Hill and The Barn, appear to have been noticed first by Mr. Seale,* 
who thought the shells were of marine origin ; and this opinion was 
shared by Lamarck and others for some time, but their true character 
was subsequently discovered. The late Professor Edward Eorbes, 
E.E.S., in reference to ten species of them, writes as follows:! — 
“ Of five subfossil Bulimi, the affinities of two are decidedly and 
remarkably South American. The Bulimus auris-mdpina is unlike any 
old-world form, and its relations must be sought for in the Brazilian 
B. bilabiatus, and probably B. melanostoma and its allies. For allies 
of the equally peculiar Bulimus darviniams we must also go to Brazil 
and compare with B. e/oniostoma and similar types. Of the other 
two, the affinities are with species now living in St. Helena. 
Bulimus sealeianus is nearly allied to Bulimus heleua of Peeve (not 
of Quoy) and the Achatina ewulata of Benson. Cochligena fossilis of 
Sowerby is allied to this, but very distinct. Bulimus blofeldi is 
nearly allied to an existing undescribed species found by Mr. 
Alexander feeding on the cabbage-trees only on the highest points 
of the Island. The affinities of the latter are decidedly West 
African ; those of the former point in two directions, African and 
South American, the latter character possibly prevailing. 
“An Achatina , called Cochlicopa subplicata by Mr. Sowerby, is 
chiefly connected with West Indian forms, but has also relations on 
the West Coast of Africa, such as the A. clavata of Sierra Leone. 
Mr. Sowerby described an allied species under the name of Cochli- 
copa terebcllum. 
“ 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 
Succinea is remarkable for its peculiarities. 
“ One of the Helices is most nearly related to Madeiran types. 
Mr. Sowerby has described four species, II. bilamellata, H. polyodon, 
II. spurca, and II. biplicata, in his note on Mr. Darwin’s collection. 
I have examined the first and third of these. 
“ I have endeavoured elsewhere! to show that all the informa- 
tion we possess respecting the Marine Mollusks of the coast of St. 
Helena would lead us to infer the very ancient isolation of that 
* Geognosy of the Island of St. Helena, by Mr. Seale, 
f Proceedings of Geological Society, March 10th, 1852, p. 196. 
+ Kep. Brit. Assoc, for 1851. 
