454 THE CRUISE OF THE ' GUBAQOA: 



slightly scaled ; inner portion of left valve below the ear with 6 

 or 6 scale-like teeth. 



Length 1 inch 7 lines. 



Breadth 1 inch 5 lines. 



Hah. Tongatabu, Friendly group. 



Approaches, in general appearance, to tlie dull variety of P. 

 varius, a European shell. 



PLATE XLII. Fig. 8. 



PEBNA (:I80GK0M0N) SAM0EN8I8, Baird. 



Shell sometimes orbicular, sometimes ovate, rather thin, con- 

 centrically laminated and longitudinally rather obscurely ribbed ; 

 ribs on upper valve tinged with a purple hue, especially near the 

 umbo ; on under surface the shell is' of a uniform dead white 

 colour ; beaks incurved ; teeth pits on ligamental hinge about 5 

 in number ; inner surface of valves dull pearly. 



Lens'th from 1 inch 4 lines to 1 inch 6 lines. 

 Breadth 1 inch 2i lines. 

 Hah. Tutuila, Samoan group. 



Note. — The specimens upon which all the preceding species have heen 

 founded, have been presented to the British Museum by Julius Brenchley, Esq. 

 Unfortunately, the examples of Helicina frdgurata have been lost by the artist. 



