Frustule elliptical, truncate; valve lunate, with straight ventral margin; median line biarcuate; no central area. Striæ on the dorsal side not interrupted, 9 in 10 µ. Ventral side striate toward the ends. Differs from A. robusta chiefly in size and coarseness of puncta. Extremely variable in size. Common along the coast. Pl. 15, Figs. 5, 6, and 19. AMPHORA OVALIS (BRÉB.) KUETZ. Frustule elliptical, truncate; valve lunate; median line biarcuate; striæ on dorsal side 10-16 in 10 µ. _Var. libyca (Ehr.) Cl._--Central area distinct on the dorsal side. _Var. pediculus (Kuetz.) Cl._--Central area and nodule quite distinct. Striæ finer than in var. libyca. Common in ponds. Quite variable. Pl. 15, Fig. 7. AMPHORA GIGANTEA VAR. FUSCA A. S. Frustule elliptical; valve lunate, with straight ventral margin. Axial area absent on the dorsal side; dorsal striæ, 10 in 10 µ, punctate. Ventral part hyaline except at the ends, which are obliquely striated, with short, punctate lines. L. 70-120 µ. Absecon, N. J. Pl. 38, Fig. 1. DIPLAMPHORA AMPHORA CRASSA GREG. Valve linear-elliptical, with obtuse, incurved ends. Median line biarcuate. Axial and central areas indistinct on the dorsal side; striæ coarsely punctate, interrupted by a longitudinal line on the dorsal side. Along the coast. Pl. 15, Fig. 3. {66}AMPHORA AREOLATA GRUN. Valve with straight ventral margin; median line straight, approximate to the ventral margin; axial area indistinct; several longitudinal lines crossed by apparent costæ which alternate with rows of fine puncta. Blue clay. Rare. Pl. 15, Fig. 11. HALAMPHORA AMPHORA COFFÆIFORMIS (AG.) KUETZ. Frustule lanceolate, truncate; zone with numerous divisions. Valve arcuate on the dorsal and nearly straight on the ventral side; ends protracted or slightly capitate. _A. aponina_ Kuetz. _A. salina_ Wm. Sm. Along the coast. Pl. 15, Figs. 8 and 18. OXYAMPHORA AMPHORA LINEOLATA EHR. Frustule membranaceous, elliptical, truncate, with broad ends. Zone with numerous divisions. Dorsal part striated transversely; ventral side with longitudinal lines. _A. plicata_ Greg. _A. hyalina_ H. L. Smith, Type No. 64. Along the coast. Pl. 15, Figs. 9 and 10. AMPHORA OSTREARIA BRÉB. Frustule oblong, with rounded angles. Zone with five or more divisions transversely striated. Central area narrow, biarcuate; central nodule dilated to a stauros. Valve narrow, with arcuate dorsal and straight ventral margin, acute at the ends. Striæ transverse, finely punctate. _A. vitræa_ Cl.; _A. porcellus_ Kitton; _A. quadrata_ Bréb.; _A. elegans_ Greg. Appearance varies according to the position of the valve. Along the coast. Pl. 15, Figs. 12 and 21. AMPHORA LÆVIS GREG.