STROMBUS. 117 



the base, with a hump or nodule on the back, near the suture; 

 yellowish white and orange-brown in longitudinal irregular 

 zigzag lines, with several narrow white bands crossed by brown 

 markings, interior white, radiately ridged within the outer lip. 

 Length, 2 inches. 



Indian Ocean, Philippines. 

 Tar. SEPTIMUS, Duclos. Fig. 57. 



Spire more exserted, showing a closely nodulous angle on the 

 whorls, body-whorl less distinctly or not at all humped on the 

 back, lip more expanded at the shoulder. 



S. FUSIFORMIS, Sowb. PI. 6, fig. 58. 



Smooth, spirally grooved at base and behind the outer lip, 

 spire occasionally varicose, narrow ty margined below the suture; 

 inner lip callous, narrow, ridged across, interior of outer lip 

 radiately ridged ; lip exteriorty thickened, scarcely expanded ; 

 interrupted ly marbled and banded with orange-brown and white, 

 aperture white or tinged with dark chestnut. 



Length, 1*5 inches. 



? Red Sea, Australia. 

 S. VARIABILIS, Swainson. PL 6, figs. 59-61. 



Spire plicate, the whorls angulated and nodose on the angle, 

 the plicae on the body-whorl short, body-whorl narrowly grooved 

 at the base, lip smooth within ; white, or yellowish with orange- 

 chestnut zigzag markings, and four narrow white bands, also 

 crossed by the markings, or } T ellowish white, with chestnut 

 bands, aperture white, columellar lip sometimes with a central 

 chocolate blotch. Length, 2 inches. 



Zanzibar, Philippines, Australia, Samoa Is., etc. 



S. athenius, Duclos (fig. 61), is a synonym. 



S. MINIMUS, Linn PI. 6, fig. 62. 



External coloring and sculpture same as in the preceding 

 species, but usually smaller, the inner lip narrow, thickly cal- 

 lous, running up the spire as far as the outer lip, from which it 

 is separated by a narrow channel ; interior white, deepening 

 within to golden yellow. Length, T25-l;5 inches. 



Philippines, Viii Is. 



I have considerable doubt whether the distinctive characters 

 are sufficiently reliable to separate this from the preceding species. 



