98 THE NAUTILUS. 



Found on leaves of plants on Chatham Island at an elevation of 

 1600 feet above the sea. 



No species of this family has been reported from the Galapagos 

 before. The type is not unknown in the Panamic region but is said 

 to be absent from the west slope of the Andes. 



Leptinaria chathamensis n. s. 



Shell small, horn-colored, with a blunt apex and six rounded 

 whorls ; suture very distinct, surface polished, delicately marked 

 with lines of growth ; base rounded, widely umbilicated ; aperture 

 Avith the margin hardly thickened ; rounded in front and at the 

 suture ; pillar broad, thin ; body with a single elevated thin, sharp 

 lamina, extending spirally inward from a point a little behind the 

 peristome and nearly equidistant from the inner and outer lips. 

 Alt. of shell 3'0, max. diam. 1*6 mm. 



Chatham Island, on ferns at 1600-2000 feet above the sea. 



Somewhat analogous forms are found in the mountains of the 

 Panamic region. 



Zonites (Hyalinia) Baueri n. s. 



Shell small, horn-colored, polished, Avith four whorls ; periphery 

 subangular or rounded ; dome of the base more elevated than that 

 of the spire ; suture distinct ; surface with delicate incremental lines 

 and finely grooved throughout by sharp but microscopic spiral strife. 

 Aperture rounded-lunate without sharp angles, wider than high ; lip 

 sharp, unreflected, throat unarmed; base minutely perforate ; alt. 

 of shell 1'5, max. diam. 2'2, min. diam. 1'6 mm. 



South Albemarle Island on weathered bones of tortoises. 



The single specimen of this very interesting form may not be quite 

 adult, and therefore the slight tendency to angulation on the 

 periphery may be lost in the full-grown shell. The absence of any 

 form of Helix or Zonites has been commented on by most of those 

 naturalists who have treated of the Galapagos shell fauna and it 

 was certainly a most extraordinary deficiency from any point of 

 view. This discovery of Dr. Bauer's removes the most striking 

 anomaly of the fauna. 



In addition to the above Dr. Bauer obtained specimens of an un- 

 described Bulimulus {Pleuropyrgus) which had also been collected 

 by Dr. Habel on his visit to the Galapagos in 1868. Dr. Habel 

 presented the writer with specimens on his return and these have 

 been named in manuscript by Dr. R. E. C. Stearns B. (Pleuro- 



