PARTULA, LOUISIADE ISLANDS. 303 



specific distinction between P. similaris and P. woodlarkiana. 

 The type specimens of both were returned to Australia by 

 Dr. Hartman. I have copied a photograph of the type of 

 P. similaris in fig. 13. Specimens from the Trobriand Is. are 

 also figured, pi. 37, figs. 14, 15. The shell is somewhat 

 transparent grayish yellow, flesh-tinted near the apex. The 

 surface is very distinctly and beautifully decussate, the deeply 

 engraved spiral lines being made wavy by the fine, rather 

 distinct growth-striae. The last whorl is convex, narrowly 

 umbilicate, and sometimes margined below the suture on its 

 last half. A narrow margining thread may be seen in places 

 above the suture. The suture itself is edged throughout with 

 a fine white line. The callous thickening within the lip thins 

 out rather gradually above, not abruptly as in many related 

 species, but it stops abruptly about half way up the 'eolu- 

 mellar margin. At the 'columellar insertion there is a slight 

 groove. 



Length 18, diam. 10, aperture 9.4 x 6.7 mm. ; whorls 5. 



Length 16.8, diam. 9.2, aperture 9 mm. ; whorls 5. 



P. woodlarkiana Hartman appears to have a somewhat 

 larger aperture than similaris, but it is otherwise very like. 

 A photograph of the type is copied in my figure 16, of plate 

 37. The original description follows : 



"Shell dextral, ovate, thin and translucent; body- whorl 

 inflated ; whorls 5, rounded, suture impressed, lines of growth 

 decussated by numerous waved spiral striae, spire short, colu- 

 mella slightly arcuate, wide and smooth, compressly umbili- 

 cate, aperture round ovate, lip concave, white and moderately 

 reflected; color yellowish, apex very pale rose. Length 19, 

 diameter 11, length of aperture 9, diameter 6 mm. Woodlark 

 Island (Hartm.). 



98. P. OCCIDENTALS Hedley. PI. 37, fig. 4. 



"Shell dextral, ovate elongate, thin and translucent; color 

 ( ?) ; whorls 5, rounded, last a little flattened below the suture ; 

 sculpture: everywhere encircled by close sharply impressed 

 spiral lines, which are decussated by oblique irregular lines 



