GASTROCOPTA, SOUTH AMERICA. 99 



Peristome little expanded, labiate. Length 2*4 to 2y 2 , width. 

 1 to 1% mm. 



Pitcairn Island, Tuamotu group (Dohrn-Pfeiffer coll., 

 from H. Cuming). 



Differing from all the species of the section LeucochUus 

 known to me, with the exceptions of P. marginalba P. and 

 P. pellucida P., the species under consideration has a horn- 

 brownish color, and is so easily to be distinguished from the 

 second Pacific species of this section by this, as well as by the 

 shape of the shell, the more numerous palatal plicae and the 

 thickened rim of the small aperture, that the relegation of 

 our form to P. pediculus as a variety cannot well be enter- 

 tained. 



That one of the two species from Pitcairn Island enumer- 

 ated in Beck's Index, p. 85, is identical with cur species ap- 

 pears very possible ; yet as diagnoses of these nominal species 

 do not exist, to my knowledge, I feel justified in proposing 

 a new name for the species here described (Boettger). 



33. GASTROCOPTA CLAUSA (Reibisch). PL 19, figs. 9, 12, 13, 14. 



Shell deeply rimate, ovate-cylindric with obtuse summit, 

 thin, smooth, matt, pale corneous or whitish. Suture rather 

 deep. 4% convex whorls. Aperture nearly vertical, round, 

 narrowed by numerous teeth. The bipartite parietal tooth 

 runs deeply into the throat, also the columellar tooth; in the 

 outer wall there are two small denticles, sometimes wanting, 

 on each side of the strongly developed middle tooth (which 

 stands opposite the parietal tooth). The peristome expands 

 but little and is hardly reflected, the ends joined by a rounded 

 callous. Length 2.2, diam. 1.25 mm. Aperture 0.9 mm. long, 

 0.8 wide (Reibisch). 



Galapagos Islands: Indefatigable, on shrubs near the sea- 

 shore (Wolf). Abingdon, at sea level (Snodgrass). 



Pupa (Leucochila) clausa REIBISCH, Abhandlungen der 

 Naturw. Ges. Isis, 1892, p. 27, pi. 2, f. 10 (1893). Pupa 

 clausa Reibisch, BALL, Proc. A. N. S. Phila., 1900, p. 94. 



This species is a further evolution product of Pupa wolfii 

 Mill., to which P. munita of Albemarle Island forms a transi- 

 tion (Reibisch). 



