Fig.
_a_, _b_, and
_f_ (upper shell), Balanus tintinnabulum,--_var._ communis.
_c_ and _f_ (part of shell), " " " validus.
_d_, " " " " coccopoma.
_e_, " " " " concinnus.
_f_ (part of shell), " " " validus.
_g_, " " " " zebra.
_h_, " " " " crispatus.
_i_, " " " " spinosus.
_k_, " " " " occator.
_l_, " " " " d'Orbignii.