84 PLACOSTYLUS, SOLOMON IS. 



upper but little convex, the last elongate, large, very obliquely de- 

 scending, peculiarly swollen or gibbous at the left side. 



Aperture long, inversely ear-shaped, about three-fifths the length 

 of the shell, dirty white within, becoming reddish or brownish to- 

 wards the lip, provided with a strong white parietal tooth; columellar 

 fold very prominent, white ; lip expanded, subreflexed, fleshy-reddish, 

 the margins joined by a thin parietal callus ; columellar margin much 

 retiexed, half covering the umbilicus. 



Length 78, diam. 33, length of aperture inside 44, width 14^ mill. 

 (Smith}. Solomon Is. 



Placostylus calus E. A. SMITH, P. Z. S., 1891, p. 489, pi. 40, f. 7. 



This species is about the size and general form of PL macfarlandi 

 of Brazier, but differs in having the body-whorl a little longer in pro- 

 portion to the spire, and the aperture is also more elongate, and the 

 peristome is fleshy red and more expanded. It is more elongated 

 than PL macgillivrayi Pfr., and has a less acuminate spire, but it 

 agrees with it in the character of the columellar fold and the tubercle 

 above it on the body- whorl (Smith). 



P. MACGILLIVRAYI (Pfeitfer). PL 36, figs. 27, 28, 29, 30. 



Shell compressed-umbilicate, oblong-fusiform, rather solid and 

 and strong, tawny-brown, with narrow darker streaks, becoming pink 

 or flesh-tinted on the spire (sometimes pale yellow with olive streaks, 

 the spire flesh tinted); suture bordered with a w r hite or pink band. 

 Surface glossy, sculptured with slight growth-wrinkles, and under a 

 strong lens showing crowded, very fine and waved spiral strice, very 

 superficial and sometimes lost by erosion or cleaning. Spire conic, 

 rather stout, the apex obtuse. Whorls 5 to 5^, slightly convex, the 

 last not ascending in front, somewhat compressed and perceptibly 

 cylindrical. 2^ early whorls punctate. 



Aperture flesh-colored within, deepening to a livid reddish toward 

 the lip (but nearly white in yellow specimens); peristome thick, flesh- 

 colored or brownish-pink, somewhat expanded but not reflexed, strongly 

 thickened within on the outer, basal and columellar margins, the 

 thickening reduced toward the posterior termination of the lip, form- 

 ing a wide, shallow posterior sinus. Columella broadly reflexed above, 

 folded, the fold bearing a very strong white callus, which is curved 

 outwaid forming a rounded channel along the root of the columella. 

 Parietal callus thin and transparent, bearing a strong, erect, oblong, 



