SAINT HELENA. 640 



doubt, I think, that this assertion was founded either upon an 

 inaccuracy of identification or else an inaccuracy of habitat. 



The B. ain^is-vulpina, which has been brought from St. 

 Helena by almost every naturalist who has visited the island 

 during the last fifty years, appears to be quite extinct ; though 

 the comparatively perfect preservation of occasional examples, 

 in which the outer cuticle is hardly destroyed and even the 

 colour is partially traceable, would perhaps imply that it must 

 have lingered on to a somewhat recen< period. Still, by far the 

 greater majority of the individuals, which are for the most part 

 firmly imbedded in the surface soil at an altitude of from about 

 1400 to 1700 feet above the sea, are extremely thickened but 

 decomposed, and shew unmistakeable signs of age. It is in the 

 north and north-east of the island that the B. auvis-vulpina, 

 exclusively occurs, — particularly in an indurated, whitish, cal- 

 careous kind of earth on the ridge between the conical moun- 

 tains known as Sugarloaf and Flagstaff, and towards the Barn. 

 Many of my examples were taken by the Eev. H. Whitehead 

 and his son, and I also possess two which were found by Mr. N. 

 Janisch. 



Bulimus Darwinianus. 



T. crassa, elongata, ovato-fusiformis, obtecte rirnata, parce 

 et irregulariter transversim [i.e., longitudinaliter) striata, albida, 

 quasi cretacea, decolorata ; anfractibus 6, antice (i.e., mox pone 

 suturam, impressam, obliquam, nucleum versus grosse crenatam) 

 subconvexiusculis ; columella subcontorta ; apertura angustula ; 

 peristomate intus incrassato, marginibus callo robusto (longe 

 intus in medio plica obtusa tuberculiformi armato) junctis, 

 columellari valde incrassato, subreflexo. — Diam. maj. 8 ; long. 

 18 tin. 



Bulimus Darvinianus, Forbes, Journ. Geol. Soc. viii. 198. 



t. 5. f. 1 (1852) 

 „ „ Pfeif., Mon. Hel. iv. 506 (1859) 



„ „ Melliss, St. Hel. 122 (1875) 



Habitat in locis similibus ac prsecedens, versus borealem in- 

 sula? ; semifossilis. 



This is smaller, narrower, and more fusiform than the last 

 species, less roughened or sculptured, with the suture more 

 oblique, and (as in the vars. /3 and <y of the B. auris-vulpina) 

 with an obtuse plait, or tuberculiform gibbosity, far within the 

 aperture in the middle of the ventral wall. The shell is thick 

 and colourless (the latter, however, being due, in all probability, 

 to its subfossilized condition) ; the right margin of its peristome, 

 although not renexed, is a good deal incrassated internally, and 



