NEW SPECIES OF MOLLUSKS OF THE GENUS CHILINA. 



By William B. Marshall, 



Assistant Curator, Division of Mollusks, United States National Museum. 



Of the species herein described as new, four were received from 

 Mrs. T. S. Oldroyd, of Stanford University. Three of them come 

 from obscure lakes and rivers in the Andes along the border be- 

 tween Chile and Argentina. The fourth comes from Southern 

 Chile, with no more specific locality given. One new species from 

 Lake Nahuel Huapi in the Andes in the Province of Kio Negros, 

 Argentina, and a new subspecies of Chilina 'parchappii Orbigny 

 from Mar del Plata, Argentina, were received from Dr. Florentino 

 Felippone of Montevideo, Uruguay. A new species, from the 

 stomach of a bird on Lake Wafrel, Chile, has lain for many years 

 without identification in the Museum collection. 



CHILINA AURANTIA, new species, 



Plate 1, fig. 6. 



Shell elongate-ovoid, rather solid, smooth and slightly glossy, the 

 satures obscurely margined. Last whorl very large; aperture very 

 wide. Surface closely spirally striated, the last whorl malleated 

 behind the aperture. Aperture Scaring, outer lip simple; columella 

 white, not very wide, flattened and a little twisted, and bearing a 

 white twisted tooth on the inner side of its upper end ; parietal wall 

 entirely covered with a white callus, and bearing a linear rudi- 

 mentary tooth on its middle portion. Color bright orange yellow 

 with four ashy spiral bands which show also within the aperture. 



The type. Cat. No. 360163, U.S.N.M., measures : Length, 20 mm. ; 

 diameter, 12 mm. ; length of aperture, 15 mm. It is from the 

 stomach of a " pejerey bird," taken on Lake Wafrel, Chile, Decem- 

 ber 31, 1903. Cat. No. 226315, U.S.N.M., includes 14 other speci- 

 mens taken from the same bird. 



This species is very similar to that described in this paper under 

 the name of Chilina castanea., but differs in the color, the greater 



No. 2550.— Proceedings U. S. National Museum, Vol. 66, Art. 13. 



100813—24 1 



