SPECIFIC DESCRIPTION 



PLATE I. 

 Explanatory of the parts of Univalve Shells. 



PLATE II. 



Explanatory of the parts of Bivalves and Multi- 

 valves. 



PLATE III. 



Fig. 1. Chiton squamosus. 



Shell 8-valved, semistriate ; marginal membrane 

 scaly. 



Bom. Mus. C<ss. p. 5. Tab. I. 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 



