94 PLACOSTTLUS, SOLOMON IS. 



Section Aspastus Albers, 1850. 



White, arboreal species of long contour, without spiral sculpture,, 

 inhabiting the southern two islands of the Solomon group. 



P. MILTOCHEILUS (Reeve). PL 38, figs. 53, 54. 



Shell compressed-umbilicate, fusiform, thin, white, covered with a 

 thin pale lemon-yellow cuticle which is generally wholly lost in adult 

 shells. Surface glossy when unworn, strongly and coarsely plicate 

 lengthwise, the spire and base nearly smooth. Spire long and 

 slender, the apex obtuse. Whorl 5^ (or in small forms 5), but 

 slightly convex, the last oblong, swollen or gibbous, somewhat sack- 

 like, at the base. Aperture fusiform, white within, the peristome ver- 

 milion narrowly reflexed, scarcely thickened within ; parietal callus,, 

 thin and transparent, pale yellow from the underlying cuticle; colu- 

 mella dilated, with a weak fold above. 



Alt. 68, diam. 25, longest axis of aperture 40 mill. 



Alt. 53, diam. 20, longest axis of aperture 30 mill. 



San Ghristoval, Solomon Is., at Port Maker a, Wanga Bay, 

 Recherche Bay and Port Achard, on the leaves of bushes and trees 

 (Brazier), southeast part of San Christoval (Guppy); varieties on 

 Ugi or Gulf Island, Sesarga, Ulana or Contrariete Island, and Santa 

 Anna Island. 



Bulimus miltocheilus REEVE, Conch. Icon., pi. 49, f. 322 (Novem- 

 ber, 1848) PFR., Zeitsch. f. Malak., 1848, p. 120; Monogr., iii, 

 p. 371 ; iv, 440; ri, 77; viii, 108; Conchyl. Cab., p. 147, pi. 45, 



f. 18, 19 DESHAYES, in Fer. Hist., ii, p. 105, pi. 154, f. 3, 4 



PHILIPPI, Abbild. u. Beschreib., iii, p. 98, Bui, pi. 9, f. 7 



CROSSE, Journ. de Conchyl., 1864, p. 148 BRAZIER, P. Z. S., 



1869, p. 162 Otostomus miltocheilus ADAMS, Gen. Rec. Moll., ii, 

 p. 151. Aspastus miltocheilus CHENU, Man. de Conch., p. 437, fig. 

 3216. Bulimus (Placostylus) miltocheilus E. A. SMITH, P. Z. S., 

 1885, p. 595. B. (Aspastus] miltocheilus BRAZIER, Proc. Linn. 

 Soc. New South Wales (Ser. 2), ix, p. 569, with varieties stramineus 



(p. 569), minor, albolabris (p. 570) Placostylus miltocheilus KOBELT, 



Conchyl. Cab., p. 63, pi. 15, f. 2-5. 



A beautiful species, arboreal in habits. The mantle is said to be 

 green, giving the living mollusk the appearance of a lanceolate leaf. 

 The typical form (figs. 53, 54) is denuded of the very thin cuticle in 

 adults, and the base is more or less markedly sack-like. 



