44 QASTEEOPODA. 



not recurved, margin slightly crenatecl. Outside uniform brownish, 

 generally much eroded and covered with alga3 ; interior brown above 

 the muscular impression, which is white ; silvery round the mouth ; 

 margin spotted with brownish purple. Height, T4 ; length, 27 ; 

 breadth, 2 "2. 



In the young the interior is darker and the mouth is rayed with 

 yellowish white. 



Common. 



200. P. margaritaria, Chemnitz ; P. ornata, Deskayes, Anim. 

 sans vert., vii., p. 542. Oval, conical, more or less depressed, radiately 

 ribbed, apex not recurved, margin crenated. Pale greenish or reddish 

 yellow, with about twelve brownish black rays spotted with white ; 

 interior above the musuclar impression purplish black, below silvery 

 rayed with pale yellow and brownish black. Height, - 4 ; length, 1 ; 

 breadth, 7. 



Common. 



201. P. OCtoradlata, sp. nov. Depressed, thin, apex sub- 

 central, smooth, with eight broad ribs projecting far beyond the 

 margin. White. Height, - 2 ; length, 1 ; breadth, '8. 



West Coast of South Island. A single specimen only. 



202. P. tramoserica, LamarTc, I.e., vii., p. 542. Ovate, de- 

 pressed, thin, with granular radiating ribs ; apex not recurved, 

 margin crenated. Olivaceous brown or dark purple, with red and 

 yellow radiating ribs ; interior silvery, tip white or greyish white. 

 Height, -25 ; length, 1 ; breadth, '85. 



Variable in colour. 



Common. Australia and Peru. 



203. P. Stellifera, LamarTc, I.e., vii., p. 535. Ovate, rather 

 depressed, with fine radiating decussate ribs ; apex not recurved. 

 Blackish or reddish brown, with radiating white stripes, which some- 

 times do not reach the margin ; interior white, silvery, tip greenish 

 brown. Height, '25 ; length, - 95 ; breadth, 7. 



Found also at the Friendly Islands. 



204. P. imbricata, Reeve. Ovate, rather depressed, with rough 

 squamose radiating ribs, apex slightly recurved ; margin nearly smooth. 

 Dark grey ; inside silvery, purplish, tip brown. Height, '5 ; length, 

 1-6 ; breadth, T3. 



205. P. pottsi, sp. nov. Ovate, solid, rather depressed, with 

 smooth rounded radiating ribs ; apex anterior, slightly recurved ; 

 margin slightly waved. Brown or olivaceous, rayed with white in the 

 grooves, and variegated with white round the apex ; interior rather 

 silvery, rayed with brown and white, tip yellowish white. Height, I'l ; 

 length, 2-6 ; breadth, 2'4. 



West Coast of the South Island. 



206. P. flava, sp. nov. Ovate, conical, radiately ribbed, apex 

 recurved, margin crenated. Pale yellow, inclining to orange towards 



