PARTULA, MARQUESAS ISLANDS. 171 



either entirely lost, or only a 'belt remains at and below tire 

 periphery, in adult shells. The upper edge of the subperi- 

 pheral brown band often shows as a thin line above the sutures 

 of the spire; but frequently a mere brown line replaces the 

 band, and is concealed on the spire (fig. 5). 



In another form of the species, the cuticle is removed in a 

 zone below the suture. This zone may be wide or narrow; 

 the remaining portion of the last whorl usually half to three- 

 fourths is covered with greenish or dull brown cuticle. 

 These variations seem to be characteristic of different colonies. 



The beautifully developed spiral striation is 'Characteristic 

 of all forms. The lip is flatly reflected, thickened at the inner 

 rim, and rather abruptly narrowed near the upper angle. 

 The umbilical crevice is widely open. 



3. P. STRIGATA Pease. PI. 30, figs. 8, 12. 



The shell is openly umbilicate, acutely ovate, rather thin, 

 dingy olive-brown, the latter part of the last whorl light 

 cream-brownish with a few darker oblique streaks, and an 

 orange streak in the angle behind the lip. Sculpture of fine, 

 waved spiral lines. Embryonic shell of 2% whorls, coarsely 

 pitted in spiral lines except the smoothish initial half whorl. 

 Whorls 4%, convex, the last evenly rounded. The aperture is 

 ovate, oblique, peristome flesh-tinted, flatly reflexed, rather 

 narrow, thickened within except near the upper angle. 

 Length 19, diam. 10.8, aperture 10.8 mm. 



Marquesas (Pease). Huapu (Garrett). 



Partula strigata PEASE, Amer. Journ. of Conch, iv, 1868 ? 

 p. 155, pi. 12, f . 7 ; P. Z. S. 1871, p. 473. PFR., Monogr. viii, 

 p. 202. GARRETT, Journ. A. N. S. Phila. ix, 1884, p. 80. 



The types, one of which was figured in A. J. C. iv, are before 

 me. The above description and figs. 8 and 12 were drawn 

 from them. Pease gave simply Marquesas as the habitat, but 

 Garrett >stated that ' * Pease 's shells were collected by a native 

 missionary residing on Woapo." This island lies south of 

 Nukahiva. In his Marquesan -catalogue of 1887 Garrett 

 places strigata as a synonym of recta, without remark. 



