_Var._ (3) validus (Pl. 1, figs. _c_, _f infra_): _globulo-convex; coarsely ribbed, ribs flexuous; either smooth or rugged; pale chocolate purple or pink; shell extremely strong; orifice almost circular_. _Var._ (4) zebra (Pl. 1, fig. _g_): _conical; rich chocolate purple with broad snow-white ribs; sheath bright chesnut colour; summits of alæ oblique; orifice almost circular_. _Var._ (5) crispatus (_Schröter_) (Pl. 1, fig. _h_): _pale blueish or pinkish-purple, with irregular rough projections, or with short, sharp, needle-like points; scuta with their exterior surface either plain, or with radiating lines formed of hood-like projecting points_. _Var._ (6) spinosus (_Gmelin_) (Pl. 1, fig. _i_): _globulo-conical or cylindrical; shell rather thin, with long, upcurved, nearly cylindrical, very sharp points; colours very pale; attached to other specimens, and to Lepas anatifera_. _Var._ (7) coccopoma (Pl. 1, fig. _d_; Pl. 2, fig. 1 _f_, 1 _l_, 1 _o_): _globulo-conical; orifice small, rounded; walls generally smooth, thick; intense rose-colour, sometimes most faintly striped longitudinally with varying shades of pink; radii tinged with purple; scutum sometimes as in_ var. communis, _sometimes with its basi-tergal corner much cut off, with the adductor ridge prominent, the pit for the depressor muscle deep, and the articular ridge broad and hooked; tergum sometimes as in_ var. communis, _sometimes with a broader spur, placed nearer to the basi-scutal corner of the valve_. _Var._ (8) concinnus (Pl. 1, fig. _e_; Pl. 2, fig. 1 _g_): _globulo-conical; walls finely ribbed; dull purple, tinged and freckled with white; scutum, with a broad, hooked, articular ridge, with an extremely sharp plate-like adductor ridge, and with a cavity, bordered by a plate, for the rostral depressor muscle; tergum as in_ var. 1. _Var._ (9) intermedius: _radii with their summits slightly oblique; parietes pale blueish purple, with narrow dark purplish-blue longitudinal lines; sheath with the internal surface of the rostrum and lateral compartments much darker colored than the internal surface of the carina and carino-lateral compartments; scuta and terga as in_ var. communis. _Var._ (10) occator (Pl. 1, fig. _k_; Pl. 2, 1 _b_): _radii with their summits slightly oblique; parietes smooth, or ribbed, or spinose; very pale blueish-purple, with narrow darker longitudinal lines; sheath with the internal surface of the rostrum and lateral compartments dull blue, whilst the corresponding parts of the carina and carino-lateral compartments are white; scuta with small, sharp, hood-formed points, arranged in straight radiating lines; terga with the spur placed at either its own width, or less than its own width, from the basi-scutal angle_.