_Var._ (1) communis: (2 _e_, 2 _h_, 2 _l_,) _nearly white, with pale or dark violet-coloured longitudinal stripes: epidermis rarely persistent: shell either thin or thick: radii white or freckled with reddish mahogany colour, with their summits either oblique, sometimes in a high degree, or nearly parallel to the basis: basal point of spur of the tergum either square or bluntly pointed_. Hab. Mediterranean, W. Indies, S. Africa, Philippine Archipelago, New South Wales. _Var._ (2) venustus: (2 _a_,) _white or pale pink, with narrow bright pink, or broad pinkish-purple stripes; orifice either much dentated or nearly entire. Tergum with the carinal half of the basal margin sometimes much hollowed out_. Hab. W. and S. Africa, Ceylon. _Var._ (3) pallidus: (2 _c_, 2 _k_,) _white, with or without a yellowish persistent epidermis; sometimes with the edges of the compartments tinted purple: radii moderately oblique: tergum generally narrow, with the spur sharp, and the basal margin on its carinal side much hollowed out_. Hab. W. Africa, Madagascar, Red Sea. _Var._ (4) niveus: (2 _f_,) _white, with longitudinal hyaline lines; epidermis not persistent_. Hab. W. Indies, Florida, S. Africa, &c. _Var._ (5) modestus: _upper part of shell white, lower part uniform blueish-gray, opercular valves as in_ Var. (1). Hab. unknown. _Var._ (6) Stutsburi: (2 _d_, 2 _i_, 2 _m_, 2 _n_, 2 _o_,) _white, with or without pinkish-purple stripes, which are often confluent, rendering the lower part of the shell of a uniform purplish tint; epidermis persistent: radii very narrow: tergum narrow, spur sharp, varying in form and in exact position; carinal margin sometimes highly protuberant; basal margin on the carinal side of the spur generally, but not invariably, much hollowed out_. Hab. West Africa. _Var._ (7) obscurus: (Pl. 5, fig. 2 _g_,) _with narrow, approximate, obscure and often almost confluent, slaty, or pale purplish-brown, or dark slate-coloured stripes_. Hab. West Indies, Australia, and unknown. _Var._ (8) variegatus: _with narrow, approximate, dusky, claret-coloured stripes, transversely freckled with white; shell conical; walls very thin: scutum with the adductor ridge small_. Hab. New Zealand. _Var._ (9) (_an. spec._?) cirratus: (fig. 2 _b_,) _shell very pale purplish-brown, with faint, more or less plain longitudinal stripes, transversely freckled with white; walls thin: scuta with the lines of growth beaded: basis, in specimens growing in groups, irregularly cup formed: maxillæ with the inferior corner extremely prominent_. Hab. Mouth of Indus, Australia, Philippine Archipelago.