454 THE CRUISE OF THE ' CUllAgOA: 



slightly scaled ; inner portion of left valve below the ear with 5 

 or 6 scale-like teeth. 



Length 1 inch 7 lines. 



Breadth 1 inch 5 lines. 



Hab. Tongatabu, Friendly group. 



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

 varius, a European shell. 



PLATE XLII. Fig. 8. 



PEBNA ilSOGNOMUN) 8AM0ENSIS, Bainl. 



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 smface 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. 



Length from 1 inch 4 lines to 1 inch 6 lines. 

 Breadth 1 inch 2i lines. 

 Hab. Tutuila, Samoan group. 



Note. — The speciuieus upon which all the preceding species Lave been 

 founded, have heen presented to the British Museum hy Julius Brenchley, Esq. 

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



