550 TEST ACE A ATLANTIC A. 



the 'columellary portion completely seals up the umbilical per- 

 foration. 



The B. Darwinianus is found in company with the B. 

 auris-vulpina in the extreme north and north-east of the 

 island, imbedded on the ridge-like slopes of indurated soil in 

 the vicinity of Sugarloaf, Flagstaff, and the Barn. I possess 

 examples which were taken by the Kev. H. and Mr. P. White- 

 head, and Mr. N. Janisch ; but the species does not appear to 

 be quite so common as the B. auris-vulpina. 



Genus 6. STTBULINA, Beck. 



Subulina melanioides, n. sp. 



'T. elongata, angustula, turrito-conica, subobtecte anguste 

 perforata, nigro-brunnea (interdum subrufescens) strigisque 

 ochreis (rarius rufo-ochreis) irregularibus plurimis confluentibus 

 longitudinaliter marmorata, confertissime longitudinaliter cos- 

 tulato-striata, subopaca ; anfractibus 8-9 convexiusculis, sutura 

 valde profunde subundulatim impressa, ultimo (-| longitudinis 

 breviore) mox supra aperturam parvulam auriformem plus 

 minus distincte angulato-carinato (carina ssepe evanescente, et 

 etiam in lineolam impressam mergente), anfractibus antice 

 oblique ochreo-subplicato-gibbosis (plicis, aut nodis, paucis, 

 valde distantibus, et postice omnino evanescentibus) ergo antice 

 inter nodos breviter subexcavatis ; columella alba, nitida, intus 

 subemarginato-sinuata et basi rotundate truncata ; peristomate 

 simplici, acuto. Long. 9-11 ; apert. 3| ; diam. maj. 3|- lin. 



Obs.- anfractus interdum lineolis obsoletissimis perpaucis 

 remotis spiralibus (aeque discernendis) instruct! sunt. 



Habitat regionem centralem humidam excelsam insulae ; 

 circa radices graminum ad rupes crescentium, rarissima. 



This is unquestionably the most remarkable addition to the 

 living Pulmoniferous Gastropods of St. Helena which we made 

 during our late six months' sojourn in that island. It was first 

 obtained by Mrs. Wollaston (and subsequently by myself and 

 Mr. P. Whitehead in the same locality) in a damp and precipi- 

 tous, but practically dried-up, watercourse issuing from the 

 northern flanks of the great central ridge, about midway between 

 Action and Diana's Peak ; but as the specimens were invariably 

 dead and mutilated (though, at the same time, recent and highly 

 coloured), it was evident to me that they had been washed into 

 that situation by the winter floods, and that their real home was 

 in the densely wooded region immediately above the spot where 

 we found them. Still, the sides of the precipice were too steep 

 and inaccessible to admit of an exploration ; though a single 



