PARTULA, TAHITI. 183 



shell somewhat enlarged on pi. 25, fig. 7. It has some re- 

 semblance to P. a/finis, but the last whorl is far more com- 

 pressed laterally than in affinis. The spire is reddish-brown, 

 becoming darker towards the apex, which is blackish-purple. 

 The last whorl is olivaceous-chestnut, closely streaked with 

 yellow. The last half of the last whorl is strongly com- 

 pressed at the side, with a very convex, "saccate" base. The 

 umbilical crease is rather ample. The rather narrowly re- 

 flexed lip is fleshy-tinted, thin-edged, having a strong in- 

 ternal thickening. No parietal tooth. Sculpture consists 

 of very fine and close spiral striae crossing the growth- 

 wrinkles, and continuing to the lip. This shell measures, 

 length 19, diam. 11, length of aperture 10 mm. G-arrett 

 writes: "I took a few examples of this ground species about 

 two miles up Papenoo valley, on the northeast coast of Tahiti. 

 They were all found lurking among the roots of ferns." 



The identity of the original P. stolida of Pease is doubt- 

 ful. There is little in the description to exclude it from 

 P. compressa, yet the statement that it is "dentate" prob- 

 ably indicates that what Pease originally had was a form 

 closer to P. affiuis (no. 



11. P. OTAHEITANA (Bruguiere). PI. 26, figs. 13-15; pi. 28, 

 fig. 13. 



"This species is fluviatile and was discovered during the 

 same voyage as the preceding [Captain Cook's], in the brooks 

 of the island Otahiti. The shell is sinistral, oblong, oval, 

 very thick, not more than 10 or 11 lines in length by about 

 6 in diameter. It is composed of 5 whorls, united exteriorly, 

 and as much swollen as those of the austral Bulimus, but 

 coiled in a direction contrary to that of most shells; that is 

 to say, the right side of its animal is towards the left. The 

 spire is conic and terminates in a pointed summit. The 

 sutures resemble those of the preceding species [P. faba]. 

 The 'aperture is semi-oval, oblique, rounded at the base, only 

 a third longer than wide, and shorter ( by a line than half 

 the shell. Outer lip arcuate, much reflexed and recurved to 



