PLATE VIII. 



PAG* 



Fig. 49. LUCINA (HERE) KICHTHOFENI. Magnified. 



49 a. Side view showing the convexity and the position of the lunular pit. 



49 b. Hinge. 



Fig. 50. CRASSATELLA COLLINA. Natural size. 29 



Fig. 51 MYTILUS MATHEWSONII. Natural size. 30 



Fig. 52. MODIOLA MULTIRADIATA. Natural size. 30 



