156 PARTULA. 



Soft anatomy of Partula. 



The first anatomical observations on Partula were by 

 Ferussac, who discovered that these snails are viviparous. He 

 erroneously states that they have no tentacles, only the eye- 

 pedicels. The next work was by Heynernann, who figured 

 the teeth of P. Urata. 



The following species of Partula were dissected by Dr. C. 

 Semper (Reisen im Archipel Philippinen, Landmollusken, 

 pp. 158, 159) : P. canalis semilineata, recluziana, Urata (pi. 

 17, f. 18, jaw), hyalina (pi. 16, f. 21, genitalia), lineata, 

 otaheitana (pi. xii, fig. 21, genitalia), vanikorensis (pi. 17, 

 f. 17, teeth) . P. lineata was probably not correctly identified. 



In 1875 (Proc. Acad. N. S. Phila., p. 244) Mr. W. G. 

 Binney examined the anatomy of numerous Raiatean species : 

 P. fusca (pi. 19, f. 9, genitalia), citrina, planilabrum ab- 

 breviata, umbilicata (pi. 19, f. 7, genitalia), bilineata (pi. 19, 

 f. 10, genitalia), amanda (pi. 19, f. 4, teeth), virginea (pi. 

 19, f. 8, genitalia, f. 11, jaw), and gracilis, besides several 

 unidentified species. Some of the same information is re- 

 peated in Annals, of the N. Y. Acad. Sci. iii, p. 127. 



I have examined more or less fully P. rosea, P. varia, P. 

 arguta and some unidentified Raiatean species received with- 

 out the shell. 



We have therefore some knowledge of the soft parts in 

 species of the sections Partula, Leptopartula, Samoana, and 

 Thakombaua, inhabiting the Society, Samoa and Fiji groups. 



Animal externally like that of Bulimulidcu or Helicidcs; 

 blunt before, the tail long, gradually tapering. There are 

 no pedal furrows, and the sole is undivided. Dorsal grooves 

 weak, but the genital furrow is well developed. Genital pore 

 behind the right tentacle, as usual. The labial processes are 

 rather large. The mantle has very small right and left 

 lobes. The tentacles are as well developed as usual in land 

 snails (pi. 32, fig. 10, P. canalis}. 



Garrett writes: "The examination of the animals of the 

 various species has convinced me that they possess no re- 

 liable external features that will aid in their determination. 



