PL ATE VIII. 



PAGE 



Fig. 49. Lucina. (Here) Richthofeni. Magnified. 29 



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

 49 b. Hinge. 



Fig. 50. Crassatella collina. Natural size. 29 



Fig. 51. Mytilus Mathewsonii. Natural size. 30 



Fig. 52. Modiola multirabiata. Natural size. 30 



