" ExPLICATIO FiGURAKUM. 



Till). II. Fig-. 1, a, Okthls zonata, valva major, retusa; b, eadein, valva minor; c, d, e, eadem species a 



basi et a lateralibiis visa. 

 Fig. 2, Ortuis callactis a. 

 Fig. 3, a, b, c. <i : Ohthis calligramma. 



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

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

 Fig. 6, a, b, c, d : Orthis elegantula; — 6, e : hujus sjieciei valva majoi- intus visa ; fi, f: valva 



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

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



