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[6 a ] , [Acasta lævigata] , tergum, internal view; [6 b ] , another var. [7 a ] , [Acasta fenestrata] ; [7 b ] , scutum, and [7 c ] , tergum, internal views.[8 a ] , [Acasta purpurata] ; [8 b ] , scutum; [8 c ] , tergum, internal views.[9 a ] , [Acasta sporillus] ; [9 b ] , carino-lateral compartment (almost rudimentary) and lateral compartment, seen from within; [9 c ] and [9 d ] , scutum and tergum, seen from within.Fig. [1 a ] , [Tetraclita porosa] , var. communis. [1 b ] ,”””rubescens.[1 c ] ,”””nigrescens.[1 d ] ,”””elegans.[1 e ] ,”””communis, young, with radii developed.[1 f ] ,”””patellaris.[1 g ] ,””basal edge of wall of shell.[1 h ] ,””basal edge of wall of shell, var. elegans, showing also the structure of one of the
rudimentary radii or sutures.[1 i ] ,””internal view of scutum; [1 k ] , do. of tergum; [1 l ] , do. of scutum, var. ; [1 m ] , do. of tergum, var. [2 a ] , [Tetraclita serrata] ; [2 b ] , portion of external surface of wall, low down, near basis; [2 c ] and [2 d ] , scutum and tergum, internal views.[3 a ] , [Tetraclita rosea] , scutum; [3 b ] , tergum; [3 c ] , whole shell; [3 d ] , basal edge of wall of shell.Fig. [1 a ] , [Tetraclita purpurascens] , var. with surface disintegrated, and with the sutures united and obliterated. [1 b ] , [Tetraclita purpurascens] , var. well preserved, with the radii developed; [1 c ] and [1 d ] , var. scutum and tergum, internal views.[2 a ] , [Tetraclita costata] ; [2 b ] and [2 c ] , scutum and tergum.[3 a ] , [Tetraclita vitiata] ; [3 b ] , basal edge of portion of wall; [3 c ] and [3 d ] , scutum and tergum, internal views of; [3 e ] , tergum, internal view, var. [4 a ] , [Tetraclita cœrulescens] ; [4 b ] , scutum and tergum united, external view; [4 c ] and [4 d ] , scutum and tergum, internal views.[5 a ] , [Tetraclita radiata] ; [5 b ] , scutum and tergum united, external view; [5 c ] and [5 d ] , scutum and tergum, internal views.[6 a ] , [Elminius Kingii] ; [6 b ] and [6 c ] , scutum and tergum, internal views of; [6 d ] , tergum, var. external view of; [6 e ] , tergum, another var. internal view of.
Fig. [1 a ] , [Elminius modestus] ; [1 b ] , scutum, internal view; [1 c ] , tergum, internal view; [1 d ] , do., tergum, var. ; [1 e ] , do., tergum, var. [2 a ] , [Elminius plicatus] ; [2 b ] , basal edge of portion of wall of shell; [2 c ] and [2 d ] , scutum and tergum, internal views of; [2 e ] and [2 f ] , scutum and tergum, internal views of, var. [3] , [Elminius simplex] ; shell.[4 a ] , [Pyrgoma Anglicum] ; [4 b ] and [4 c ] , scutum and tergum, internal views.[5 a ] , [Pyrgoma cancellatum] , shell, seen from above; [5 b ] , shell seen on the under side; [5 c ] and [5 d ] , scutum and tergum, external views; [5 e ] and [5 f ] , scutum and tergum, internal views of.[6] , [Pyrgoma Stokesii] , shell imbedded in coral.[7 a ] , [Pyrgoma conjugatum] , shell, external view of; [7 b ] , scutum and tergum, calcified together, seen from the outside; [7 c ] , do., internal view of.