EXPLANATION OF PLATE VII. 



Akca (Latiarca) idonka Conrad (p. 47). 



Fio. 1. Copy of Coui-iuVs fijjiiri^ of the species, Miocene Foss., PI. xxix, fig. 3, no fragment from 



New .Jersey being perfect enough to figure. 



Arca (Barbatia) Marylandica Conrad (]>. 48). 



Figs. 2, .3. Exterior :ind interior of the largest fragment observed. 



4. Copy of Coniiid's original figure, Miocene Foss., PI. xxi.x, fig. 1. 



AxiNEA LENTiFORMiis Conrad (p. 4!t). 



Figs. 5,6. Two views of the largest specimen observed. 



Ni'CULA PROxiMA Say (p. 50). 



Figs. 7, 8, 0. Three views of specimens of the species, enlarged two diameters. 

 10. Further enlargement of the surface. 



YOLDIA LIMATULA Say (p. 51). 



FiG.s. 11, 12. Views of two valves of the species, the first enlarged two diameters. 



AsTARTE DISTANS Conrad (p. 53). 



Fig. i:i. I'^xteriov of a small specimen showing crowded undulations, 

 II. l.'i. ( i)i]io8ite views of a right valve. 

 It), 17. .Similar views of a Igft valve. 



158 



