284 PARTULA, NEW HEBRIDES. 



smaller, more slender, 'sinistral, ' smooth, without any trace of 

 transverse striae, and last whorl produced." (Pease). 



Group of P. auraniana. 

 73. P. AURANIANA Hartman. PL 34, figs. 7, 8, 9, 10. 



The shell is deeply rirnate, rather thin but solid, ovate- 

 conic. The last two whorls are whitish (probably denuded 

 of cuticle) below the suture, elsewhere covered with a thin 

 greenish yellow cuticle with some inconspicuous darker streaks. 

 The spire lacks cuticle and is very pale brownish, almost 

 white. Apex obtuse; embryonic whorls slightly convex, 

 punc'tate-striate, not so high as in P. fraterna. Subsequent 

 whorls more convex, sculptured with distinct, regular en- 

 graved spirals, which are somewhat weaker and more widely 

 spaced on the upper part of the last whorl, closer and deeper 

 on the base. Last whorl is strongly convex, its last half 

 however being perceptibly compressed laterally; base very 

 convex. The aperture is but slightly oblique, symmetrically 

 ovate, faintly flesh-tinted within. Peristome white, moder- 

 ately reflexed, thickened within. Columellar margin dilated 

 above 



Length 18.8, diam. 11, aperture 10 mm. ; whorls 5. 



Length 18.25, diam. 11, aperture 10 mm. ; whorls 4%. 



Length 18, diam. 10.9, aperture 10 mm. ; whorls 4%. 



Length 17.5, diam. 11, aperture 10 mm. ; whorls 4%. 



New Hebrides: Aura (? Arag) Island, in the Malo Pass, 

 Santo Espirito group (Layard, type loc.) ; Lo and Hiu islets 

 of the Torres group (Walker). 



Partula auraniana HARTM., Proc. A. N. S. Phila. 1888, p. 

 250, pi. 13, f. 1. SYKES, Proc. Malac. Soc. Lond. v, 198. 



This is said to be a common species. It differs from P. 

 fraterna chiefly by the better developed spiral striation, lower 

 embryonic whorls and shorter spire ; yet it is not improbable 

 that intermediaite forms occur. 



An embryo of 2i/> whorls, 4.9 mm. long, is figured, pi. 34, 

 fig. 8. The first half whorl is pale brown and smooth, fol- 

 lowing whorls are densely punctate-s'triate above. The peri- 



