1867.] MR. G. F. ANG.VS ON NEW HELICID^. 889 



at the base, which is also ornamented with two partially interrupted 

 spiral chestnut bands ; aperture oblique, rhomboidally" ovate ; peri- 

 stome rose-Goloured, the margins distant, the right slightly flexuous 

 and expanded, the basal reflexed, arcuated and obsoletely toothed 

 within. 



Diam. niaj. 9, min. 7|, alt. 6| lin. 



Hub. St. Stephen Island and Ysabel Island, Solomon group. 



3. Geotrochus ambrosia. (PI. XLIII. figs. 9, 10.) 



Shell imperforate, globosely conical, moderately thin, very finely 

 obliquely striated, whitish, ornamented with two purplish brown 

 bands, the lower one broader, and frequently mottled with irregular 

 opaque bluish-white oblique blotches ; spire convexly conical, apex 

 rather obtuse ; whorls five, convex, the last descending, convex at 

 the base, which at the front part is purplish brown, from which a 

 third band of the same colour extends a little below the periphery ; 

 columella sloping, rather wide, nearly straight, flattened ; aperture 

 diagonal, truncately oval ; peristome white, the margins distant, the 

 right slightly expanded and flexuous, the basal reflexed. 



Diam. maj. JO, min. 8\, alt. 10 lin. 



Hab. Galera, or Russell Island, Solomon group. 



4. Geotrochus coxianus. (PI. XLIII. figs. 7, 8.) 



Shell imperforate, trochiform, rather thin, obliquely finely striated, 

 polished, creamy white, the lower whorls ornamented with irregular 

 chocolate-brown spots; spire conical, apex rather obtuse ; whorls 

 six, flatly convex, the last scarcely descending, obtusely angled at 

 the periphery, convex at the base, the umbilical regiou pale purplish 

 brown, with the central portion chocolate-brown ; columella sloping, 

 flattened, chocolate-brown ; aperture very oblique, ovate ; peristome 

 chocolate-brown, the margins approximate, slightly thickened and 

 expanded, the right flexuous above. 



Diam. maj. 11, min. 9\, alt. 11 Un. 



Hab. Ysabel Island, Solomon group. 



I have named this beautiful species in honour of Dr. Cox of 

 Sydney, whose indefatigable exeitions in the cause of science have 

 made us acquainted with many new Australian and Polynesian shells. 



5. Geotrochus MENDANA. (PI. XLIII. figs. 11, 12.) 



Shell perforate, conical, solid, obliquely finely striated, pale brown, 

 ornamented with a whitish sutural band and two chestnut bands, the 

 upper contiguous to that at the suture ; spire conical, apex acute ; 

 whorls seven, slightly convex, the last not descending, obscurely 

 angled at the periphery, convex at the base, which is broadly banded 

 with reddish brown ; aperture diagonal, truncately oval ; peristome 

 white, widely expanded and reflexed, the colnmellar margin trian- 

 gularly dilated and reflexed, almost covering the perforation. 



Diam. maj. 11, min. 9, alt. 13 lin. 



Hab. Ysabel Island, Solomon group. 



Proc. Zool. Soc— 1867, No. LVII. 



