MUSEUM OF COMPARATIVE ZOOLOGY. 187 



seem more applicable to the latter than the former species. Unfortunately Les- 

 son never publislied a figure of P. rufa. 



t P. rustica Pse., A. J. C, ii. p. 199 ; id. p. 81, pi. 1, f. 5, 1866-67. Raiatea, 

 Garr. = P. crassilabris. After examining large quantities of these two so-called 

 species, I have arrived at the conclusion that they are one. Typical P. crassila- 

 bris is more rounded in form, while P. rustica is more elongate, and the colu- 

 mella is indented from without, giving the aperture an angular appearance. The 

 colors agree, and large numbers of each exhibit the inosculation of the two varie- 

 ties. They are both terrestrial, from the same island, and doubtless identical. 



t P. semilineata Mouss., J. C, xvii. p. 337, 1869, Coll. Mus. Godeff. = P. con- 

 ica, sinistral yellow var. 



t P. sinistrorsa Pse. Mss., Mus. Godeff. Cat., v. p. 92, 1874. Tahiti, Garr. 

 Coll. Pse. I have considered this shell to = P. Otaheitana, banded var. It cer- 

 tainly inosculates with the original brown P. Otaheitana, as we see examples of 

 the latter with one or two dark bands. 



f P. sinistralis Pse. Mss., Patel Cat., p. 104, 1873. Tahiti. Oliin P. sinis- 

 trorsa ? 



t P. simplaria Morelet, J. C, iv. p. 370, pi. 11, f. 13, 14, 1853. Huaheine 

 = P. rosea var. 



t P. simulans Pse., A. J. C, vii. p. 202 ; id., iii. p. 81, pi. 1, f. 1, 1866-67. 

 Moorea, Garr. ^ P. spadicea var. 



•)■ P. solidula Rve. Mon. Part., species 2, pi. 4, f. 22, 1850. Bora-bora, Garr. 

 = P. lutea var. 



f P. solidula Pse. Mss., Coll. Pse. (nou Rve.). Raiatea^P. approximata 

 banded var. 



f P. spadicea Rve., Mon. Part., species 24, pi. 4, f. 24, 1850. Moorea, Garr. 

 Marquesas, Rve. The synonyms of this species I arrange as follows : P. tseniata, 

 P. spadicea, P. elougata, P. simulans, P. striolata, P. nucleola. A microscopic 

 examination of the surface of these varieties exhibits it thickly crowded with waved 

 spiral striae, exceeding in this respect all other species. A small tubercle is present 

 on the columella of all the varieties, and the junction of the lip with the body 

 whorl presents the appearance of having been cut off obliquely outwards, leaving 

 a sharp elevation, which is seldom surrounded by callus. Large quantities from 

 Moorea exhibit all these varieties, merging into each other. All the varieties ex- 

 hibit translucent or hora-colored specimens with dark bands of greater or less 

 width, which equal P. tsuiata. 



t P. strigata Pse., A. J. C, iv. p. 155, pi. 12, f. 7, 1863 ; also Rve. Mon. 

 Part., pi. 3, f. 17. Marquesas? Rve. Huaheine, Garr. Coll. Pse., Coll. A. N. S., 

 ex auctorc = P. varia var. 



t P. strigosa Pfr., P. Z. S., p. 384, 1856. Admiralty Island, Pfr., Moorea = 

 P. suturalis Pfr. 



t P. striolata Pse., A. J. C, ii. p. 197 ; id., p. 81, pi 1, f. 4, 1866-67 = 

 P. spadicea var. Moorea. 



t P. STENOSTOMA Pfr., P. Z. S., 97, 1855. Moorea. 



t P. STOLiDA Pse., A. J. C, ii. p. 198, 1868. Ruiatea, Garr. Tliis shell is 



