HELIX-PAPUINA. 29 



Agrees with H. antiqua in form and proportional size of aperture, 

 but differs in the clear lemon-yellow color. In this last character it 

 resembles the form described by Sowerby as jET. horderi, but that 

 species has a far more elevated spire and greater number of whorls. 

 I have doubts as to whether this form and the next are actually 

 from New Guinea, as alleged. 



H. HORDERI Sowerby. PI. 14, fig. 58. 



Narrowly perforated, elevated, conical, rather solid, obliquely 

 very finely striated, yellow. Spire elevated, apex acute. Whorls 

 6, a little convex, the last slightly inflated, obsoletely angled at the 

 periphery, the base convex. Aperture wide, oblique; peristome 

 broadly expanded and reflexed, columellar margin provided with a 

 small tooth-like tubercle inside, outwardly dilated, flattened. 



Alt. 35, diam. 30 mill. (Sowb.) 



New Guinea. 



H. (Geotrochus) horderi G. B. SOWERBY, JR., P. Z. S. 1889, p. 

 577, t. 56, f. 1. 



Differs apparently from H. antiqua in the yellow color, greater 

 number of whorls and higher spire, consequently the mouth is 

 shorter in proportion to the total length. 



(6). GROUP OF H. PILEOLUS. 



Subperforate or imperforate ; pyramidal, acutely carinated, the 

 base flat. Distribution, Moluccas and New Guinea. 



H. PILEOLUS Ferussac. PI. 11, figs. 99, 100, 1, 2, 3. 



Nearly covered-perforate, trochiform, carinated, rather solid, 

 striatulate, the base minutely decussate-gran ulose; opaque, whitish 

 or brownish, flamed with brown ; apex acute, liver-brown ; spire 

 conical, more or less elevated ; suture superficial, hair-margined. 

 Whorls 5, the earlier 2 or 3 convex, the remainder flat, the last a 

 little convex below, descending a little (rarely not at all) in front. 

 Aperture very oblique, rhombic-triangular, the peristome reflexed, 

 white or pale rose-brown ; at the outer angle it is curved over into a 

 beak, and at the columellar insertion it is dilated. (Mart.) 



Batchian and Little Tawalli Islands, Moluccas. 



H. pileolus FER., Hist., t. 63 A, f. 1, 2. v. MART., Ostas. ZooL, 

 Landschn., p. 231, t. 17, f. 8-10. PFR., Monogr. v, p. 326, 501. 

 Geotrochus pileolus WALLACE, P. Z. S. 1865, p. 412. 



