HELIX-PAPUINA. 77 



horny or whitish with a broad brown band above, and a narrower 

 one just below the periphery, which is very acute and white. 



Alt. 10, greater diam. 16, lesser 14 mill. 



Choiseul Bay, San Christoval, Shortland and Treasury Is., Solomon 

 Group. 



Typically quite distinct from helicinoides, but intermediate forms 

 occur. Smith's var. septentrionalis belongs here. 



The basal band is wanting in one suite before me (pi. 15, figs. 81- 

 83.) 



The form described as var. meridionalis Smith (pi. 16, fig. 5) is 

 smaller, pale brown above, with a white, thread-like line at the 

 suture and the acutely keeled periphery, paler beneath, especially to- 

 ward the center, and have the aperture particularly acuminate at 

 the termination of the keel. It is from Santa Anna Island, living 

 on young cocoa-nut palms, growing on low ground bordering the 

 sea. 



H. CINERACEA Hombron & Jacquinot. PI. 15, figs. 88, 89 ; pi. 16, 



figs. 6, 7. 



Imperforate, globose-trochiform, the spire conical, periphery of the 

 last whorl acutely keeled. Surface striatulate, most minutely and 

 closely spirally striated. Pale brownish horn-colored, somewhat 

 translucent, paler on the central part of the base. Aperture rounded- 

 rhomboidal ; peristome white, narrow, very little expanded, thick- 

 ened within, columellar margin straightened, sloping, slightly 

 sinuous. 



There are 5, slightly convex whorls ; the apex is corneous-brown ; 

 the last whorl is convex above, very convex beneath, far more so 

 than H. helicinoides. The color is often reddish-brown with a light 

 band at the suture, and the central tract of the base light ; the 

 periphery has a white thread also. 



Alt. 10, greater diam. 12 J, lesser 11 mill. 



San Christoval, Ysabel and Stephens Is., Solomons. 



H. cineracea HOMBR. & JACQ., Voy. Pol Sud Atl., t, 7, f. 30-33. 

 PFR., Monogr. Hel. Viv. iv, p. 203. H. cinerarea Kouss. in text 

 of Voy. Pol Sud p. 28. 



This is a decidedly more globose shell than H. helicinoides. The 

 base is more convex, and the columella less sinuated above. 



