92 



PLACOSTYLUS, SOLOMON' IS. 



its size, translucent, the sculpture and markings are very visible on 

 the body whorl through the wall of the shell by transmitted light; 

 shining and lustrous, of a light reddish-brown color, the whorls of the 

 spire becoming lighter in shade and more of a pinkish-brown ; orna- 

 mented with many irregularly-sized and irregularly-distributed 

 chestnut-colored tentoriform markings ; whorls slightly inflated, 

 causing the suture to assume an impressed character. Suture mar- 

 gined by a narrow, opaque, slightly raised, knotted, selvaged margin 

 (not smooth and straight as represented in the figures) ; whorls lon- 

 gitudinally irregularly marked with lines of growth and transversely 

 subcostately ridged with rather coarse raised undulating lines, which 

 frequently anastomose (a character quite omitted in the figures, but 

 which is very characteristic), becoming much less distinct on the 

 whorls beyond the body whorl, till, on the third whorl from it, they 

 are almost invisible, and are gradually replaced by a granular punc- 

 tation, which increases in distinctness quite to the apex ; these gran- 

 ular punctures are disposed in two distinct transverse slanting rows, 

 one running from right to left, the other from left to right. Aperture 

 oblong-ovate, of a pinkish-brown color ; peristome only slightly thick- 

 ened and everted, pinkish-brown throughout, except at the columella 

 which is of an opaque white only very faintly tinted with pink-brown; 

 columella broadly expanded and dividing at its insertion, as in all the 

 shells of this group, into two processes, the outer and smallest grad- 

 ually blending with a thin transparent glassy callus, which runs to- 

 wards the insertion of the upper end of the peristome, which is rather 

 arched out from the side of the shell as it leaves its insertion (more 

 so than is represented in tiie figure), the larger process of the divided 

 columella enters spirally the interior of the shell. In the several 

 specimens of this species which I have seen, there is no disposition 

 to the formation of a callosity or tooth on the body whorl in the aper- 

 ture between the inserted ends of the peristome. Length 58, breadth 

 27 mill." (Cox.} 



Maleita Island, Solomon Archipelago (Hobson). 



Bulimiis (Placostylas) hobsoni Cox, Proc. Linn. Soc. New South 

 Wales (Series 2), vi, pt. 3, p. 567, pi. 20, f. 2, 3 (May 23, 1892). 



Allied to P. scottii Cox, but differing in being marked with tri- 

 angular spots, and in the less strong columellar fold. 



The figures of this form published by Dr. Cox are defective ac- 

 cording to him in not showing the sculpture nor margination of the 



