602 S. B. MITKA. 



the stomach is slowly and gradually dissolved there, and is 

 mixed there with particles of food material, the starchy 

 portion of which is transformed by it into a reducible sugar. 



DESCRIPTION OF PLATE 42, 



Illustrating Mr. S. B. Mitra's paper on "The Crystalline 

 Style of Lamellibranchia." 



Fig. 1. — Crystalline style of Auodoii, natural size. 



Fig. 2. — Enlarged drawing of another specimen. 



Fig. 3. — Transverse section of the crystalline style of Anodon to show the 

 laminated structure. 



Fig. 4. — Greatly enlarged view of a style of Anodon, showing the longi- 

 tudinal striation and attached food particles. 



Fig. 5. — Optical longitudinal section of a similar specimen. 



Fig. 6. — Optical longitudinal section of a crystalline style of Pholas. 



Fig. 7. — -Transverse section, showing the right and left compartments of 

 thai, portion of the intestine which lodges the crystalline style in Anodon 

 (which has no special ca;cuni for the style as has Pholas). 



Fig. 8. — Diagram showing the crystalline style in the left compartment of 

 the intestine of Anodon with the stream of food particles in the right com- 

 partment. 



Fig. 9. — Diagram showing the separate caecum and intestine of Pholas, 

 formed by completion and fusion of the dividing ridges seen in Fig. 7. 



Fig. 10. — Cryslalline style of Anodon, showing pigmented liver-cells in 

 the axis, 



N.B. — Details are explained by the lettering on the Plate. All the Figs. 

 except Fig. 6 and Fig. 9 represent the crystalline style of Anodon, 



