EXPLANATION OF PLATE XV. 
MACTRA LATERALIS Say (p. 82). 
FIGs. 1,2. Opposite sides of a right valve. 
3. Enlargement of the hinge, showing the structure. 
Fics. 4,5. 
6. 
FIGs. 7,8. 
9. 
Fic. 10. 
FIGs. 11, 12. 
. Upper and cardinal views of a specimen retaining the valves in position, enlarged. 
Fic. 1. 
16. 
17, 18, 19. 
Fig. 20. 
174 
RANGIA (PERISSODON) MINOR Conrad (p, 84). 
Opposite views of a right valve, twice enlarged. 
Further enlargement of the hinge. 
SYNDOSMYA NUCULOIDES Conrad (p. 81). 
Opposite views of a right valve, imperfect at the posterior end, twice enlarged. 
Further enlargement of the hinge. 
MAcTRA (SCHIZODESMA) DELUMBIS Conrad (p. 82). 
Copy of Mr. Conrad’s figure of this species given in his Miocene Foss., Pl. xv, fig. 1. 
CORBULA SUBCONTRACTA Whitf. (p. 88). 
Two views of aright valve, enlarged. 
CORBULA ELEVATA Conrad (p. 86). * 
Enlarged view of a right valve. 
Interior of a right valve, natural size. 
Three views of a specimen retaining the valves in position; twice enlarged. 
CORBULA IDONEA Conrad (p. 88). 
Copy of Conrad’s figure, Miocene Fossils, Pl. x, fig. 6; noneof the New Jersey speci- 
mens being sufficiently perfect to illustrate. 
