PARTULA, MARQUESAS ISLANDS. 169 



bb. Surface covered with a pale greenish cuticle, length 

 about 21.5 mm. P. recta, no. 3b. 



Whorls less than 5 ; peristome narrower or tinted, not very 

 strongly calloused. 

 a. Aperture less than two-thirds the length of the shell. 



b. Olive-brown, brown or white, opaque; lip narrow; 

 length 17 to 21 mm. P. strigata, no. 3. 



bb. Pale olive or greenish-yellow, thin, somewhat trans- 

 lucent; length 14 to 17 mm., whorls 4%. 



P. bellula, no. 4 ; P. decussatula, no. 5. 



aa. Aperture two-thirds the length of the shell; shell thin, 

 fragile, with a pale yellowish cuticle ; length 14 to 15 mm. 



P. magdalincz, no. 6. 



1. P. INFLATA Reeve. PI. 30, figs. 1, 2, 3. 



Shell openly umbilicate, globose-conic, rather thin, luster- 

 less or nearly so, varied in color: (1) white, usually with 

 some trace of an olive subperipheral band. (2) white, suf- 

 fused and obliquely streaked with brown in a broad median 

 belt, abruptly darker below the periphery; spire corneous. 

 (3) reddish or dull chestnut brown, more or less streaked, 

 and sometimes white below the sutures; reverse of the lip 

 and columella white. Of the 2% embryonic whorls the first 

 half whorl or more is smooth, the rest pitted along the spirals. 

 The rest of the shell is sculptured with very distinct, >close 

 waved spiral striae. Spire is straightly conic, suture moder- 

 ately impressed. Whorls 5%, convex, the last whorl swollen 

 in the peripheral region except for the space of a third or 

 fourth of a whorl behind the lip, where it is compressed ; this 

 gives a humped appearance to the back of the shell. Aper- 

 ture ovate; lip broad, white, flatly reflexed, thickened with- 

 in; columella broad, with a deep-seated fold above, visible 

 in oblique view. 



Length 23, diam. 17 mm. 



Length 21, diam. 16.7 mm. 



Marquesas Is.: Taiwata, (Tahuata), on trees at about 1500 

 ft. elevation; also Dominique or Hivaoa (Garrett). 



