PLACOSTYLUS, SOLOMON IS. 81 



from the island Nou, New Caledonia, but rejected by Crosse from 

 that fauna. It probably came from the Solomons, though the single 

 specimen before me, probably received from Gassies, is labelled 

 " New Caledonia." It is clearly not stutchburyi Pfr., as at one time 

 claimed by Crosse, but only a color-variety of founaJd. 



The name is in allusion to the supposed occurrence of the form 

 among mangroves, from the French name, paletuviers, of these shore 

 trees. 



P. KREFTII (Cox). PI. 35, figs. 23, 24, 25. 



Shell compressed perforate, oblong fusiform, moderately solid, 

 yellow, streaked and more or less suffused with chestnut, the spire 

 yellowish or reddish. Surface glossy, smoothish, having slight 

 growth-stria? and an excessively minute, close, wavy spiral striation, 

 the earlier 2^ whorls punctate as usual. Spire a little convexly 

 conic, the apex obtuse. Whorls nearly 5^, slightly convex, the last 

 with a very narrow, somewhat plicate white subsutural margination. 



Aperture oblong-ovate, whitish within, becoming light brown to- 

 ward the lip; peristome a little and slowly expanding on the outer 

 and basal margins, white, and very little calloused within: columellar 

 margin broadly dilated and reflexed above, the outer edge passing 

 into the parietal callus, inner margin forming a long spiral fold. 

 Parietal callus milky near the edge, not toothed. 



Alt. 58, diam. 24, longest axis of aperture 33 mill. 



Alt. 54, diam. 20, longest axis of aperture 29 mill. 



Alt. 2.1, diam. 0.92 inch (Cox). 



Solomon Islands. 



Bulimus (Charis)kreftii Cox, Proc. Zool. Soc., 1872, p. 19, pi. 4, 

 f. 4 PFR., Monogr. viii, p. 27. ? Placostylus kreftii Cox, KOBELT, 

 Conchyl. Cab., p. 132, pi. 32, f. 4, 5. 



P. kreftii has some resemblance to P. macgillivrayi in the rich 

 yellowish-chestnut cuticle and microscopic waved stria?. It differs in 

 the white peristome, the gradually widening and bifurcate columella, 

 much less prominently folded, and in wanting a parietal tubercle. 

 Cox's original figure (pi. 35, fig. 23) is a little more ventricose below 

 than the specimens before me in the collection of the Academy (fig. 

 24) and National Museum (fig. 25). 



Kobelt's P. kreftii is of doubtful identity, but may be a variety of 

 Cox's species. His comparison with P. scottii (p. 133) is due to a 

 6 



