THE CYCIiOPHORID LAND MOLLU&KS OF AiMEIRIOA 197 



basal lip, somewhat thickened on the inner lip and parietal wall. 

 Operculum typically australocyclotid, consisting of about 7 whorls. 



The specimen figured, U.S.N.M. No. 307460, comes from Ecuador. 

 It has 4.2 whorls and measures : Height, 16.5 mm. ; greater diameter, 

 25.5 mm. ; lesser diameter, 17.2 mm. Height of aperture, 12.2 mm. ; 

 diameter, 12.6 mm. 



The following lots are also from Ecuador, without specific locality : 

 U.S.N.M. No. 316108 contains 3 specimens ; U.S.N.M. No. 315045, 1 

 specimen ; U.S.N.M. No. 307418, 2 specimens. 



The narrow umbilicus and the conspicuous banding will differ- 

 entiate this from the other Austroeijclotus. 



APEROSTOMA (AUSTROCYCLOTUS) LIMELLUM, new species 



Plate 27, Figltses 6-8 



Shell of medium size, helicoid, almost subglobular, pale chestnut- 

 brown, the last whorl a little paler than the rest, both on the spire 

 and base. In addition to this there are obscure, rather broad axial 

 bands of darker and lighter brown. The nucleus consists of 2 small, 

 well-rounded, smooth whorls. The postnuclear whorls are appressed 

 at the summit, well rounded, and marked by retractive and pro- 

 tractive axial riblets, the junctions of which form weak nodules which 

 are more or less elongated. Suture inconspicuous. Periphery well 

 rounded. Base narrowly umbilicated, strongly rounded, marked like 

 the spire. Here the nodules are of about the same strength as on 

 the spire. This sculpture also extends over the umbilical wall. Ap- 

 erture subcircular, with a rather strong angulated auricle at the 

 posterior angle of the aperture. Peristome thin on the outer lip and 

 somewhat thickened and reflected on the inner lip. 



The type, U.S.N.M. No. 515906, was collected by O. Haught in the 

 Kio Cesar Valley, Magdalena, Colombia, at an altitude somewhere 

 between 100 and 300 meters. It has a little more than 4 whorls and 

 measures: Height, 17.5 mm.; greater diameter, 24 mm.; lesser di- 

 ameter, 17.7 mm. Height of aperture, 12.8 mm. ; diameter, 12.8 mm. 



The narrow umbilicus and globular form readily distinguish this 

 species from all the other Austrocyclotus, 



APEROSTOMA (AUSTROCYCLOTUS) PANAMENSE (Da Costa) 



Plate 27, Figubes 3-5 



1904. Neocyclotus panamensis Da Costa, Proc. Malac. Soc. London, vol. 6, p. 6, 



pi. 1, figs. 6-9. 

 1912. Neocyclotus panamensis Kobelt, Martini-Chemnitz Conchylien Cabinet, vol. 



1, sect. 19, pt. 3, p. 886, pi. 131, figs. 15-17. 

 1923. Poteria {Neocyclotus) panamensis H. B. Baker, Occ. Pap. Mus. Zool. Univ. 



Michigan, No. 137, p. 37. 



