1887.] NATURAL SCIENCES OF PHILADELPHIA. 127 



1846, p. 176 ; Exp. Exp. Shells, p. 58, fig. 55, PfeifFer, Mon. Hel., 

 i, p. 123; iii, p. 158, (Videna) Vers., p. 132. Chem. ed. 2d, Helix, 

 p. 270, pi. 109, figs. 25. 26. Mousson, Jour, de Conch., 1865, p. 

 170, Schmeltz, Cat. Mus. Godeff:, v, p. 94. 



Nanina {Discus) Troilus, Albers, Die Hel., ed. 2d, p. 62. Paetel, 

 Cat. Conch., p. 85. 



Trochomorpha Troilus, Mousson, Jour, de Conch., 1869, p. 333. 

 Pease, Proc. Zool. Soc, 1871, p. 474. Semper, Phil, Land-Moll., ii, 

 p. 114, pi. 12, fig. 11. 



Abundant beneath decaying leaves in forests at Upolu. 



This species is of a depressed turbinate form, with a moderate 

 umbilicus, 5i convex whorls, the last one angulated and the color 

 variable : fulvous, chestnut, corneous, luteous, unicolor or with two 

 chestnut bands one above and one beneath the angulated periphery. 

 Sometimes there is only a single spiral line on the upper surface. 

 Diam. 18 to 20 mill. 

 T. tuber, Mousson. 



Trochomorpha tuber, Mousson, Jour, de Conch., 1869, p. 334, pi. 

 14, fig. 5, Pease, Proc. Zool. Soc, 1871, p. 474. 



Helix tuber, Schmeltz, Cat. Mus. GodefF., v, p. 95, Pfeiffer, Mus. 

 Hel., vii, p. 278. 



The habitat and station is the same as the preceding species but 

 is much more rare. 



This rather small species may be characterized by its obtuse coni- 

 cal form, perforated base, yellowish horn color and two narrow 

 chestnut bands, one above the other beneath the periphery. Whorls 

 5 J, convexly-rounded and the last one very slightly angulated. 

 Diam. 12, height 9 mill. 

 T. subtrochiformis, Mousson. 



Helix trochiformis, Gould (not of Ferussac), Exp. Exp. Shells, p. 

 61. 



Helix Eurydice, Mousson (not of Gould), Jour, de Conch., 1865, 

 p. 170. 



Trochomorpha sub-trochiformis, Mousson, Jour, de Conch., 1869, 

 p. 335, pi. 4, fig. 6 ; 1870, var. albo-striata, p. 122. Pease, Proc. 

 Zool. Soc. 1871, p. 474. 



Helix sub-trochiformis, Schmeltz, Cat. Mus. Godeffl, v, p. 95. 

 PfeiflTer, Mon. Hel, vii, p. 289. 



