Carditanera minima Dall. Brownish-yellow. [Pl. IV. Fig. 11] ×10.
Crassatella marginata Cpr. [Pl. IV. Fig. 12] ×10.
Lasea rubra Mort. Tinged with red. [Pl. V. Fig. 19] ×10.
Arca solida Br. & Sby. (?). [Pl. V. Fig. 20] ×10.
(Contribution from the Zoological Laboratory of Pomona College)
Plate I