PLACOSTYLUS, SOLOMON IS. 93 



sutures and in representing the outer lip as less arcuate towards its 

 upper insertion than it really is ; but as I have no specimens, these 

 figures are reproduced on my plate. ThV type is in Dr. Cox's col- 

 lection. 



P. HARGUAVESI (Cox). PL 38, figs. 40, 50, 51. 



Shell compressed-umbilicate, oblong-fusiform, thin but moderately 

 solid; white under a thin yellowish cuticle, spotted with triangular, 

 oblong and irregular spots and dots of chestnut or olivaceous yellow- 

 brown ; the markings disappearing on the spire which is more or less 

 rose or yellow tinted. Surface slightly shining or dull, densely 

 corrugated spirally, the wrinkles anastomosing, less pronounced than 

 in P. sanchristovalensts, subobsolete on the spire, the earlier 2^ 

 whorls of which are punctate. Spire conic, apex obtuse. Whorls 

 nearly 5^, quite convex. 



Aperture white throughout, long-ovate ; peristome white, reflexed 

 and recurved, the outer lip thickened a little within ; columella 

 dilated above, passing into a convex, spirally entering fold ; parietal 

 callus transparent, bearing a strong callus nodule near the columellar 

 fold. 



Length 62, diam. 27, longest axis of aperture 35 mill. 



Length 55, diam. 25, longest axis of aperture 31^ mill. 



Treasury Island, Solomon group. 



Buiimus har graven Cox, P. Z. S., 1871, p. 323, pi. 34, f. 3. Pfr., 



Monogr. viii, p. 43 Placostyhts hargravesi KOBELT, Conchyl. Cab., 



p. 38, pi. 9, f. 2, 3, and var. heimburgi, p. 38, pi. 8, f. 6, 7 (1891). 



The color-pattern of P. hargravesi reminds one of P. malleatiis of 

 the Viti Is. The whorls are much more convex than in P. s<m- 

 christov (dens-is, the nepionic shell is smaller, the lip wider, and a 

 parietal tooth is well developed. The color-scheme varies a good 

 deal, but is much less intense than in P. sanchristovalensis, and the 

 aperture is white. Figs. 50, 51 are from a specimen in the collec- 

 tion of the Academy ; fig. 49 from one in the National Museum, no. 

 159493. 

 Var. heimburgi Kobelt. Frontispiece, fig. 5. 



Shell much smaller, more slender, rose-white with buff-brown 

 streaks, cuticle almost absent. Alt. 47, diam. 21, length of aperture 

 27 mill (Kobelt}. 



