TRID AC N A. 



Plate IV. 



Species 3. (Fig. b, c, d, Mus. Cumins;.) 



TuiDACNA. SQUAMOSA. Ill this Plate are examples of 

 three coloured varieties of the species described at Plate 

 III. The specimen, Fig. 3 //, is white, tinged concentri- 

 cally, not in rays, with pale orange-red. At Fig. 3 c the 

 shell is of a dark saiFron-yellow, with a mixture of red 



that gives it an orange tone. At Fig. 3 d the shell is 

 white, with a tinge of lemon-yellow without red. In all 

 the scales or furbelows are largely developt'd, and in tlie 

 shells of the upper and lower figures they are white ; the 

 colour described in those specimens being confined to the 

 ground of the shell. 



June, IS62. 



