PLACOSTYLUS, SOLOMON IS. 87 



P. STRANGEI (Pfeiffer). PI. 34, figs. 15, 16, 17. 



Shell compressed-umbilicate, fusiform-oblong, thin, varying from 

 straw yellow or paler to a somewhat tawny yellow with numerous 

 inconspicuous darker streaks, the suture bordered below by a white 

 band ; spire paler, sometimes pink-tinted. Surface glossy, sculptured 

 with growth-wrinkles which sometimes become thread-like, and 

 obsoletely decussated with a very shallow spiral malleation. Spire 

 slender, with slightly concave outlines, the apex very obtuse, often 

 amputated ; earlier 2-^ whorls punctate, the last suture rising a little 

 at its termination. Whorls 5 to 5-J-, slightly convex, the last swollen. 



Aperture slightly oblique, white or yellowish within, becoming 

 tinted with egg-yolk yellow toward the outer lip in adult shells ; peris- 

 tome white, reflexed and recurved at the edge throughout ; columellar 

 margin broadly dilated above. Columella passing into a long fold 

 above, this fold bearing a moderate callus on or near its convex 

 edge; parietal callus thin and transparent, in most fully adult shells 

 bearing a small tubercle near the columellar fold. 



Alt. 43, diam. 19 J, longest axis of aperture 26 mill. 



Alt. 48, diam. 23, longest axis of aperture 28 mill. 



Alt. 52, diam. 22, longest axis of aperture 29 mill. 



Eddy stone (or Narovo) Island, Solomon group. 



Bulimus strangei PFR., P. Z. S., 1855, p. 8 ; Novit. Conch, i, p. 

 54, pi. 16, f. 11, 12 ; Malak. Bl. 1855, p. 148 ; Monogr. iv, p. 378 ; 

 vi, p. 23; viii, 28 CROSSE, Journ. de Conchyl., 1864, p. 135. 

 Placostylus strangei FFLD., Verb. Zool.-Bot. Ges. Wien, xix, 1869, 

 p. 874 TAPPARONE-CANEFRI, Malac. Viaggio della R. Fregata 



"Magenta," p. 86, pi. 2, f. 11 KOBELT, Conchyl. Cab. p. 23, pi. 



5, f. 4, 5, 6. 



The obvious differential character of this species is its noticeably 

 more slender spire than that of allied species, the more lengthened 

 examples recalling P. sellersi in this respect. Pfeiffer's type was a 

 rather small form, length 46 mill., which had not developed the par- 

 ietal tubercle, the epidermis being somewhat tawny. The tubercle 

 varies a good deal in size, and is added only after the adult aperture 

 is otherwise completely formed. 



In P. stutchburyi the spire is shorter and stouter, the aperture 

 larger, and the spiral malleation much more pronounced. In P. 

 macgillivrayi the lip is not reflexed and recurved, but is decidedly 

 thickened within, the columellar and parietal projections are stronger, 

 and the mouth is reddish. 



