212 PROCEEDINGS OF THE ACADEMY OF [1885. 



Y. Expansa Group. 



t P. expansa Pse. A. J. C, p. 26, pi. 9, f. 3, 1871. Tutvila. 



P. externa Pse. P. Z. S., p. 473, 1871 (error for expansa). 

 P. externa Pfr., viii, p. 204. Nom. Helic. Viv., 302. 

 P. externa Hartm. Bib. Cat. Part., 182. 



Obs. — In Europe this shell is usually mistaken for zebrina Gld. 



f P. Peasei Cox. P. Z. S., p. 644, pi. 52, f. 2, 1871. Malay ta Island, Solomon 



Islands. 



P. PeaseiPfr., vi, 48. Nom. Helic. Viv., 303. 

 P. Peasei Hartm. Bib. Cat. Part., 185. 



Obs. — I am indebted to Dr. Cox for this extremely rare shell. 

 This group does not approximate in structure any other species 

 except umbilicata; they have been placed here provisionally, the 

 anatomy of the animal ma}*- confer upon them another status. 



VI. Otaheitana Group. 



f P. Otaheitana Brug. (Bulimus). Ency. Meth., i, p. 347, No. 84, 1792. Tahiti. 



Bulimus Otaheitanus Desh. Lam., Kiist., Pfr. 



Bulimus amabilis Pfr. 



Bulimus Isabellinus Pfr. 



Bulimus luccis Gray. 



Bulimus auriculatus Pfr. 



Helix perversa Chemn. 



Helix Otaheitana Dilhv. 



Helix laevis ? Wood. 



Partulus Otaheitanus Beck. Albers. 



Partulus Vanikorensis Beck. 



Partulus auriculatus Beck. 



Partula Otaheitana Fer. Grat., Rve., Jay, Pfr., Piietel, Hartm., 

 Garr. 



Partula Vanikorensis Lam. Pfr., Gld., Piietel, Hartm., Garr. (non P. 

 Vanikorensis Quoy and Gaim. (Helix), 

 f Partula Isabellina Rve. Pfr., Piietel, Hartm., Garr. 

 f Partula amabilis Pfr. Rve., Pse., Piietel, Gloyne, Hartm., Garr. 

 t Partula rubescens Rve. Pfr., Pse.. Hartm., Garr. 

 f Partula Reeveiana Pfr. Cliemn., Hartm., Garr. 



Partula Tahitana Gld. Pse., Schm., Hartm., Garr. 



Partula Taheitenxis Piietel. 



Partula Tahulana Anton. Hartm. 



Partula lignaria Garr. (non Pse., Pfr., Chemn., Hartm.). 



Partula affinis Garr. (non Pse., Plr., Schm., Hartm.). 



Partula rufa Carpt. Hartm. (non Less.). 



