I'LACOSTYLUS, NEW HEBRIDES. 69 



SPECIES OF THE NEW HEBRIDES ARCHIPELAGO. 



These imperfectly explored islands have representatives of three 

 groups of Placostylus : terrestrial species of the fuligineus group, 

 allied to the New Caledonian P. bavayi and its allies; second, pre- 

 sumably arboreal species of the P. hartmani group, resembling 

 Vitian and Solomon forms in their ovate contour and slender, conic 

 spire, but smoothish, with longitudinally lineolate cuticle, sometimes 

 cut into spiral bands or eroded ; and third, the subgenus Diplornorpha, 

 consisting of forms of reduced size and short, compact, Partu/a-\\ke 

 shape, but retaining the apertural characters and color, and the 

 apical sculpture of true Placostylus. 



1. Shell solid and strong, impertbrate or merely rimate ; peristome 

 not much expanded. Section Placostylus. 



2. Shell thin, perforate, the aperture ovate, lip well expanded. 



Section Pcecilockaris, p. 73. 

 Section Placostylus (Group of P. fuligineus}. 



The species are figured on plates 6, 7, 8, 11, 14, smaller figures 

 only. 



a. Base of shell rounded or tapering, without a spiral ridge around 

 the umbilical region. 



b. Columella rather slender, adnate ; shell distinctly mal- 

 leated or lirate spirally ; spire conic, rather acute ; length 

 about equal to or exceeding twice the diam. 



fuligineus, p. 70. 



b l . Columella heavy, concave above, truncate below, the 



outer edge adnate ; sculpture indistinct; spire short and 



obtuse. heterostyhis, p. 72. 



b~. Columellar lip rising free, flattened on its inner face; 



diameter over half the length. sol<.nm,,ti>>. p. 09. 



rt 1 . A ridge encircling the umbilical region, and producing a fold 



on the inner lip ; penultimate whorl bulging ; form rather 



slender. itliotn*, p. 7 '2. 



P. SALOMOXIS (Pfeiffer). PI. 6, figs. 6, 7, 8, 9. 



Shell rimate, oblong-conic, rather solid and strong, streaked chest- 

 nut and yellowish, becoming pale or reddish on the earlier whorls. 

 Surface slightly glossy, irregularly and closely wrinkle-striate, the 

 wrinkles usually more or less cut into spiral rows of long granules in 

 places, though such spiral sulcation as exists is very shallow. Spire 



