"EXPLICATIO FiGURAKUM. 



Tab. II. Fig-. 1, a, Orthis zonata, valva major, retusa; b, eadem, valva minor; c, d, e, eadem species a 



ba.si et a lateralibus visa. 

 Fig. 2, Orthis callactis a. 

 Fig. 3, a, b, c. d : Orthis calligramma. 



Fig. 4, a, b, c, d, Orthis testudinaria ; — 4, e : sulci cum striis, magn. auct. 

 Fig. 5, a, b, c, d, e : Orthis basalis. 

 Fig. 6, a, b, c, d : Orthis elegantula; — 6, e : hujus speciei valva major intus visa ; 6, f : valva 



minor intus visa ; g, valva minor a basi visa, ut repraesententur denies cardinales. 

 Fig. 7, a, b, c, d : Orthis demissa." 



