260 PARTULA, AUSTRAL AND HERVEY IS. 



"This species resembles a variety (P. auriculata Brod.) of 

 P. otaheitana Brug., but is more slender as well as smaller." 

 (Ad.). Possibly a form of P. otaheitana. 



51. P. OBESA Pease. PI. 41, fig. 22. 



"Shell umbilicate, abbreviate, conically ovate, rather thin, 

 light, transversely very finely, closely and unclulately striated ; 

 whorls 4 1 /-), the last very large, comprising nearly three- 

 fourths the length of the shell, somewhat inflated and pro- 

 duced obliquely, rounded at base, spire short, conical, rather 

 acute; aperture oblique, ovate; lip widely flatly expanded, 

 white 011 both its outer and inner sides ; columella slightly 

 expanded above ; greenish yellow, encircled with a broad white 

 band beneath the suture. 



Length 20, diam. 14 mm. 



Habitat unknown. 



Partula obesa, PSE., American Journal of Conchology iii, 

 p. 222, pi. 15, f. 12 (Jan. 2, 1868). 



The figure does not agree well with Pease's measurements. 



"We have no locality for the above species. It appears to 

 approach the Marquesau type, and may be allied to lilacina 

 Pfr. It is covered with a thin epidermis, which, when worn 

 oft', would probably leave the shell without color, as is the 

 case with ganymedes, Pfr. We have but a single specimen. ' ' 

 (Pease.) 



III. PARTUL^E OF THE AUSTRAL AND HERVEY GROUPS. 



The few species of these groups are very closely related to 

 those of the Society Islands, and no doubt are of common 

 derivation. 



In the Austral Group, Partula hyalina (see p. 180) is 

 found on Tubuai and Rurutu (Oheteroa). No other Partula 

 is known from the group. One island, Rurutu, has been 

 somewhat carefully explored for land shells (see Garrett, 

 Proc. A. N. S. Phila. 1879, pp. 17-30). 



In the Hervey or Cook's Group, P. hyalina has been found 

 on Mangaia and Rarotonga. P. assimilis Pse., a form very 

 close to P. varia of Huaheine, occurs on Rarotonga. Pease 



