3887.] NATURAL SCIENCES OF PHILADELPHIA. 129 



Cuming's Collection, labelled "Navigator Islands." It has not been 

 identified by either Prof. Mousson or myself. 



The description refers to a solid, lenticular, conoidal luteous-horn 

 colored species with a moderately sized umbilicus and five regular 

 strise. Whorls 5, convex, the last one angulated. 



T. Samoa, Hombron and Jacquinot. 



Helix Samoa, Hom. et Jacq., Voy. Pol Sud., Zool., v, p. 11, pi. 4, 

 figs. 28-31. Pfeiffer, Mon. Hel, iv, p. 69.. 



Helicopsis Samoa, Pease, Proc. Zool. Soc, 1871, p. 475. 



This species which has not been identified since the above nat- 

 uralists published their description, may possibly be a form of 

 Gould's Troilus. They give the habitat "Upoulon"= Upolu. 



They describe it as having a medium sized umbilicus, conoidal 

 form, rather fine striae, luteous color with two fuscous lines, and 

 5? whorls, the last one subangular ; base convex, aperture lunate 

 and the peristome simple. Diam. 18, height 10 mill. 



PATULA, Helil. 

 P. gradata, Gould. 



Helix gradata, Gould, Proc. Bost. Soc. Nat. Hist., 1846, p. 172; 

 Exp. Exp. Shells, p. 49, fig. 48. Pfeifier, Mon. Hel., i, p. 104. 

 (^Charopa) Paetel, Cat. Conch., p. 90. 



Discus gradatus, H. and A. Adams, Gen. Moll., ii, p. 117. 



Fatula gradata, Mousson, Jour, de Conch., 1865, p. 168 ; 1869, 

 p. 333; 1871, p. 12. 



Pitys gradata. Pease, Proc. Zool. Soc, 1871, p. 474. 



Common beneatli decaying vegetation and is probably distributed 

 throughout the group. It is common also to the Tonga Islands. 



A small, orbicular, depressed, widely umbilicated species with 5 

 convex whorls, the last one subangulated on the margin of the broad 

 umbilicus and the delicate striae of growth are cancellated by five 

 revolving impressed lines. Aperture sub-orbicular, color pale oliva- 

 ceous with radiating rufous spots. Diam. 6 mill. 



P. complementaria. Mousson. 



Patula compleynentaria, Mousson, Jour, de Conch., 1865, p. 168, 

 pi. 14, figs. 5, 1869, p. 333. 



Helix complementaria, Pfeiffer, Mon. Hel., v, p. 157. (Patula) 

 Paetel, Cat. Conch., p. 89. 



