Fics. 1,2. 
EXPLANATION OF PLATE XVI. 
SAXICAVA BILINEATA Conrad (p. 93). 
Exterior natural size and enlarged interior view of a short broad form. 
3. View of an imperfect right valve of an elongate form — 8. rugosa L. 
Figs. 4,5. 
Fic. 6 
Fics. 7 
8 
Fias. 9, 10. 
SAXICAVA MY-EFORMIS Conrad (p. 90). 
Exterior of the shell, natural size, and enlargement of the hinge. Type specimen. 
SAXICAVA PARILIS Conrad (p. 92). 
. View of the type specimen, natural size. 
PERIPLOMA ALTA Conrad (p. 85). 
. Exterior view of a specimen, showing the imprint of the internal rib on the right of the 
beak. 
. Interior of Conrad’s type specimen, showing hinge structure. 
Mee PANOPHA Goldfussi (p. 89).Wogner 
Exterior and interior views of the best valve obtained; the hinge broken. 
. Hinge of a fragment of a left valve. 
. Hinge of a right valve, looking parallel to the piane of the valve. 
. Hinge of aright valve; the tooth broken away at a. 
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