SPECIFIC DESCRIPTION. 



PLATE I. 

 Explanatory of the parts of Univalve Shells. 



PLATE n. 

 Explanatory of the parts of Bivalves and Multi- 

 valves. 



PLATE in. 



Fig. 1. Chiton squamosus. 



Shell 8-valved, semistriatej marginal membrane 

 scaly. 



Born. Mus. Cces. p. 5. t. 1. fig. 1, 2„ 



Specimen olive without, blue green within. 

 Middle valves divided on each side of the central 

 ridge into two parts, consisting of a triangular 

 compartment striated from the apex to the base, 

 and another very finely marked in the longitudinal 



