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[7 a ] , [Balanus vinaceus] , scutum, internal view; [7 b ] , do. external view; [7 c ] , tergum, external view; [7 d ] , basal edge of the parietes of one of the compartments, showing the cancellated structure of the inner lamina.Fig. [1 a ] , [Balanus Ajax] ; [1 b ] , scutum external; [1 c ] , tergum external; and [1 d ] , scutum, internal view. [2 a ] , [2 b ] , [Balanus stultus] , scutum and tergum, external views;
[2 c ] and [2 d ] , scutum, internal and external views.[3 a ] , [Balanus calceolus] ; [3 b ] , variety; [3 c ] , scutum, internal view; [3 d ] , tergum, internal view; [3 e ] , spur of tergum toothed.[4 a ] , [Balanus galeatus] ; [4 b ] , [4 c ] , scutum and tergum, internal view.[5 a ] , [5 b ] , [Balanus cymbiformis] , scutum and tergum, internal view.[6 a ] , [Balanus navicula] ; [6 b ] , [6 c ] , scutum and tergum, internal view; [6 d ] , scutum, external view.[7 a ] , [Balanus trigonus] ; [7 b ] and [7 c ] , scutum, external views, two varieties; [7 d ] , scutum, internal view; [7 e ] and [7 f ] , tergum, external views, two varieties.Fig. [1 a ] and [1 b ] , [Balanus spongicola] , external views of scutum and tergum; [1 c ] , var. of the tergum, from a specimen from the Cape of Good Hope; [1 d ] , var. of the tergum from the West Indies. [2] , [Balanus lævis] .[2 a ] ,””fossil, elongated var. , showing lower part of basal cup filled up with a cancellated mass.[2 b ] and [2 c ] ,””scutum, external and internal view of.[2 d ] and [2 e ] ,””scutum (variety ), internal and external view of.[2 f ] ,””scutum (variety ), external view.[2 g ] ,””tergum, external view.[3 a ] , [Balanus perforatus] , scutum, internal view; [3 b ] , tergum, internal view; [3 c ] , tergum, var. external view.[4 a ] , [Balanus concavus] (var. from Panama), scutum, internal view; [4 b ] , scutum, external view; [4 c ] , tergum, external view; [4 d ] , tergum, fossil, Coralline Crag; [4 e ] , tergum, fossil, Italy.
[1 d ] ,”””fistulosus.[2 a ] ,”[amphitrite] ,—var. venustus.[2 b ] ,””var. cirratus.[2 c ] ,””” pallidus.[2 d ] ,””” Stutchburii.[2 e ] ,””” communis.[2 f ] ,””” niveus.[2 g ] ,””” obscurus.[2 h ] ,”” scutum, var. communis.[2 i ] ,”””” Stutchburii.[2 k ] ,”” tergum,” pallidus.[2 l ] ,”””” communis.[2 m ] , [2 n ] , and [2 o ] ,””var. Stutchburii.[3 a ] , [Balanus pœcilus] , scutum, internal view; [3 b ] , tergum, external.[4 a ] , [Balanus eburneus] , scutum, external view; [4 b ] , tergum, external; [4 c ] , scutum, internal; [4 d ] , tergum (var. ), internal.