142 GASTROCOPTA, POLYNESIA. 



Hawaiian Is., Oahu: Pimalm, a suburb of Honolulu, type 

 loc. ; Manoa Valley ; also throughout most of the lower zone 

 of the island. Also Philippines. 



Pupa lyonsiana ANCEY, Memoires de la Societe Zoologique 

 de France, v, 1892, p. 713 ; Proc. Malac. Soc. London, vi, 1904, 

 p. 126. Leucochilus artense (Montr.) MOELLENDORFF, Bericht 

 Senckenb. Nat. Ges., 1893, p. 100, with var. cornea Bttgr. ; 

 Verzeichnis, 1898, p. 127, with inut. cornea Bttg. 



The several forms of lyonsiana and cornea approach the 

 Antillean G. servilis and its Brazilian variety oblonga so 

 closely that I have very little doubt that they are specifically 

 identical, the forms from Oahu, Guam and the Philippines 

 probably being the descendants of Antillean or Brazilian 

 snails imported 011 plants. While most of the Oahuan snails 

 show some slight variation not exactly matched in American 

 specimens examined (the shell being longer, with the spire 

 perceptibly more slenderly tapering), yet a large proportion 

 of them seem to me to be indistinguishable. Moreover, we 

 may not have servilis from the exact locality which supplied 

 the imported examples. Under these circumstances, G. lyon- 

 siana is admitted as a species with considerable reserve. 



G. seignaciana (Crosse), of Nossi-be, also is extremely sim- 

 ilar to Philippine and Hawaiian specimens. 



The typical form, from Kualii, Manoa Valley, near the type 

 locality, is drawn in pi. 24, figs. 1, 2. The color of shells taken 

 alive is cinnamon or a little paler, and transparent enough to 

 show the dried animal darkly through ; lip of the same color. 

 The shell is generally quite long, with small aperture, but 

 others in the same lot are shorter, with the proportions of G. 

 servilis. The spire is narrower in the upper part than in 

 most species of the group, the taper being almost regular in 

 some examples. Other specimens are slightly swollen in the 

 upper part, and more cylindric. The angulo-parietal lamella 

 has a small lobe in the middle, where the two lamellae unite. 

 There is no trace of the anterior end of the parietal on the 

 columellar side, the concrescence being complete. The pari- 

 etal portion is nearly straight. 



The columellar lamella is very short and horizontal. 



