1887.] NATURAL SCIENCES OF PHILADELPHIA. 125 



Helicopsis perpolita, Pease, Proc. Zool. Soc, p. 475. 



Helix perpolita. Pfeiffer, Mon. Hel., vii, p. 65. 



A number of examples occured to my notice in the same station 

 and location as the preceding species. It is also recorded from the 

 Tonga and Viti Islands. 



It may be known by its convexly-depressed form, 4? convex 

 whorls, polished surface and yellowish horn-color. Diam. 7 mill. 



M. ensifera, Mousson. 



Nanina (Gastrodonta) ensifera, Mousson, Jour, de Conch., 1869, 

 p. 328, pi. 14, fig. 2. 



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



Helix ensifera, Pfeiffer, Mon. Hel., viii, p. 259. This small spe- 

 cies, which is unknown to me is simj^ly accredited to "Samoa" and 

 was discovered by Di'. Graffe. 



It may be easily determined by its diminutive size (2 mill, in 

 diam.), depressed-globose form, thin, pellucid texture, highly polished 

 surface, minutely perforated base and plicated columella. Within 

 the aperture are two lamelliform teeth, the upper submedian and 

 the latter close to the base of the columella. 



! M. Tutuillae, Cox. 



Helix Tiduillon Cox, Proc. Zool. Soc, 1870, p. 83. Pfeiffer, Mon. 

 Hel., vii., p. 64. 



I am unacquainted with this species which was discovered by Mr. 

 Brazier at Tutuilla. 



Dr. Cox says it is a small, imperforated, depressly-conical species 



of a pale brownish color, the upper parts minutely granulated, base 



smooth and shining, and the wide suture is canaliculated. It has 



5 rounded whorls, the last not depressed or carinated, lip thin and 



the aperture is roundly lunate. "Diam. maj. 0,12, min. 0,10, alt. 



0,09, poll. (Cox.) 



TKOCHONANINA, Mousson. 

 T. Samoensis, Mousson. 



Nanina Samoensis, Mousson, Jour, de Conch., 1865, p. 165 



Helix Samoensis, Pfeiffer, Mon. Hel., v, p. 70. 



Zonites {Conula) Samoensis, Mousson, Jour, de Conch., 1869, p. 

 331 ; 1870, p. 116; 1871, p. 10. Paetel, Cat. Conch., p. 86. Schmeltz, 

 Cat. Mus. Godeff, v, p. 90. 



Helix Clayi, Liardet, Proc. Zool. Soc, 1876, p. 101, pi. 5, fig. 7. 



Microcystis Samoensis, Garrett, Jour. Phil. Acad. Nat. Sci., 1881, 

 p. 384. 



