1892.] LAND-SHEIiLS OF ST. HELENA. 267 



peristoma tenuissimum, marline exteriore simplice, haud 

 expanse, columellari supra umhilicuni angiiste reflexo, 

 tenuiter calloso, in medio plica parva vel denticulo 

 munito. 



Longit. 17 millim., diam. 7j ; apertura 7'^ longa, 4 lata. 



Var. Testa fusco-cornea, lineis opacolacteis tenuibus confertis 

 plus minus irregularibus et interruptis picta, circa medium 

 anfractus ultimi zona pallida cincta. 



Hub. High Peak, among native vegetation (I'urtou). Living. 



This perhaps is the prettiest land-shell occurring in the island, 

 and it is remarkable that it has escaped the notice of most of the 

 explorers and naturalists who have visited and collected at St. 

 Helena. Two specimens, however, have been in the collection at the 

 British Museum for many years. They were received from the 

 Museum of Economic Geology in January 1860, but it is uncertain 

 by wiiom they were collected. 



The substance of the shell is extremely thin and fragile aud the 

 surface exhibits no other sculpture excepting lines of growth. The 

 colour-ornamentation is variable. In what may be regarded as the 

 typical form the opaque creamy longitudinal markings take the form 

 of broadish irregular wavy stripes, which frequentlj"- run into one 

 another, so that they exhibit a more or less zigzag appearance. 

 In other specimens these broadish stripes are replaced by very 

 numerous and slender lines, which are more or less wavy and some- 

 times considerably interrupted aud broken up. 



The plait or denticle upon the columella is peculiar, giving to it 

 a subtruncate appearance. jB. neglectus, Pfr., B. costatus, Pfr., 

 and some other forms of Peronceus have a somewhat similar plication 

 on the columella, but rather higher up. I have much pleasure in 

 associating this beautiful species with the name of Capt.W. H.Turton. 



(Section ?) 



21. BuLiMULus MELANioiDES (Wollaston). (Plate XXII. 

 fig. 18.) 



Hub. Diana's Peak, at an elevation of over 2000 feet (Turton). 

 Living. 



This is very distinct and quite unlike any other known species. 

 It was located by Mr. Wollaston in the genus Subulina on account 

 of the truncation or fold at the base of the columella. This feature, 

 although rather higher up on the columella, is also met with in 

 certain Bulimi from Brazil, as I have already pointed out in 

 connection with the preceding B. turtoni. I therefore am inclined 

 to assign this species rather to Bulimulus than to Subulina, as more- 

 over it bears very little resemblance to any species of that group. 



22. ToMiGERUs (?) PEREiiLis, sp. uov. (Plate XXII. fio-s. 19- 

 19 6.) 



Testa dextrorsa vel sinistrorsa, minuta, obtuse pyramidalis, 

 imperforata, albida vel dilute rufescens ; anfractus 5, convex- 



