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



peristoma tenuissimum, margine exteriore sivipUce, hand 

 expanso, colmnellari supra umbilicum anguste reflexo, 

 tenuiter calloso, in medio plica parva vel denticulo 

 munifo. 

 Longit. 17 millim., diam. 7|- ; apertura 7|- longa, 4 lata. 

 Var. Testa fusco-cornea, Uneis opaco-lacteis tenuihus confertis 

 plus minus irregularibus et interraptis picta, circa medium 

 anfr actus ultimi zona pallida cincta. 

 Hah. High Peak, among native vegetation {Turtoii), 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 vrere received from the 

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

 by whom they were collected. 



The substance of the shell is extremely thin and fragile and 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 frequently 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 and broken up. 



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

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

 and some other forms of Pei'onceus have a somewhat similar plication 

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

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



(Section 1) 



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

 fig. 18.) 



Hab. 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 (?) PEREXiLis, sp. uov. (Plate XXII. figs. 19- 

 19 6.) 



Testa dextrorsa vel sinistrorsa, minuta, obtuse pyramidalis, 

 iviperforata., albida vel dilute rufescens ; anfmctus 5, convex- 



