510 Mr. H. B. Preston on new 



Aperture: alt. 33, diani. 16 mm. 



Hab. Chancliamayo, Peru. 



An extraordinary shell which it is not possible to compare 

 profitably with any species at present known ; the sculpture 

 is of the type of that of Thaumostus melanochila, Nyst, which 

 also occurred with it, but is much coarser ; the much blunter 

 form, sunken apex, and total absence of any trace of perfora- 

 tion are also among the characters which readily separate it 

 from that or any other known species. 



Among the shells received from Chancliamayo, Peru, is a 

 good specimen of what is undoubtedly BuUmus pulcherrimuSj 

 H. Ad.: the only specimen of this fine species hitherto seen 

 is, I believe, the type specimen in the British JMuseum con- 

 sisting of the last two and a half whorls of the shell, which 

 are figured in the Proc. Zoo!. Soc. 1866, p. 4.4:2, pi. xxxviii. 

 fig. 3 ; as this figure is naturally somewhat inadequate I 

 take this opportunity of figuring the specimen (PL X. fig. 6) 

 which has recently come to hand. 



BuUmulus latecolumeUuris, sp. n. (Fig. 11.) 



Shell cylindrically fusiform, perforate, moderately thin, 

 whitish, indistinctly banded and transversely tessellated with 

 pale reddish brown ; whorls 8, slightly convex, embryonic 

 whorls smooth, later whorls lightly marked with lines of 

 growth and very faintly decussate ; sutures deeply impressed, 

 slightly crenulate ; umbilicus obliquely lunate, very narrow, 

 deep, the whole umbilical region pure white ; columella 

 white, outwardly expanded, extended into a very bread 

 twisted plait above, much excavated below ; peristome wliite, 

 expanded, scarcely rtflexed, a light callus joining the margins; 

 aperture obliquely inversely auriform. 



Alt. 54, diam. maj. 24 mm. 



Aperture : alt. 22*5, diam. 15 mm. 



Hah. Peru. 



Allied to B. tujmci, d'Orbigny, from Bolivia, but much 

 smoother in general appearance, the umbilical region is quite 

 without colour, and the embryonic whorls are not punctate 

 as is the case in that species, moreover the extraordinary 

 broadly plaited columella easily separates it from B. tupaci. 



BuUmulus [Drymceus) expatriatus^ sp. n. (Fig. 4.) 



Shell fusiform, acuminate, narrowly perforate, somewhat 

 thin, pale yellow ; whorls 6^, finely spirally striate, and 

 marked transversely with lines of growth ; sutures impressed. 



