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 14J mill. 



Choiseul Bay, San Christoval, Shortland and Treasury 1$., 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 Rouss. 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. 



