AURICTJLIDiE. 65 



spots; whorls regular, the upper ones marked with flexuous 

 striae, which are obsolete at the lower part ; last whorl forming 

 two-thirds of the total length ; aperture dilated, roimded in 

 front ; parietal plaits two, the upper one rather longitudinal, 

 rather prominent, the other divided ; columellar plait lamelli- 

 form ; peristome furnished with three strong teeth, and several 

 smaller ones towards the base. Length 35, breadth 20 mill. 



Scarabus insularis, Hombr. et Jacq. Voy. Pole Sud, Zool. v. p. 40. 



pi. 10. f. 15-17. 

 Pythia insularis, Pfr. Mon. Auric, p. 85. 



Hab. Salomon's Islands. 



16. Pythia pollex. 



Shell umbilicated, conically ovate, solid, striated and wrinkled 

 longitudinally, greenish chestnut-coloured, often with two yel- 

 lowish bands at the upper part; spire conoidal, rather blunt, 

 slightly angulated on ooth sides; varices indistinct, marked 

 with a single yellow spot ; suture scarcely impressed ; whorls 

 nine, rather flat, folded arcuately near the suture, the last form- 

 ing three-fifths of the total length, rather compressed round the 

 open umbilicus ; aperture perpendicular, rather broad ; parietal 

 plaits two, the upper one dentiform, the other compressed, 

 transverse ; columellar plait lunate, scarcely ascending ; peri- 

 stome expanded and slightly reflexed, flesh-coloured, varied 

 with brown ; right margin bearing witbin two larger and five 

 to six minute teeth ; columellar margin short, much dilated, 

 spreading. Length 40, greatest breadth 25, least breadth 18 

 mill. 



Scarabus pollex, Hinds in Ami. Nat. Hist. x. p. 82. 



Hinds in Voy. Sulphur, Zool, p. 60. pi. 16. f. 9, 10. 

 A. Adams in Proc. Zool. Soc. 1850, p. 150; Ann. $ Mag. 

 N. H. 2 ser. viii. p. 69. 

 Scarabus zonatus, Hombr. et Jacq. Voy. Pole Sud, Zool. v. p. 41. 



pi. 10. f. 18-20. 

 Pythia pollex, Pfr. Syn. Auric, n. 82 ; Mon. Auric, p. 86. 



H. and A. Adams, Gen. rec. Moll. ii. p. 240. 

 Hab. Feejee Islands. 



17. Pythia costulata. 



Shell umbilicated, large, ovately conic, rather pointed, de- 

 pressed, slightly ribbed transverselv, fulvous, indistinctly spotted 

 with brown ; spire triangular, flat ; aperture arcuate ; peri- 

 stome expanded, with five teeth within ; columella bearing 

 three plaits : whorls eight. Height 16, breadth 9^ lines (Kiist.). 



