160 BULLETIiN 181, UNITE© SfTATES NlAlTTOOSnAlL MTJSlEIUM 



CALAPEROSTOMA ESMERALDENSE (Miller) 



Plate 20, FiGxntB 18 



1879, Cyclophorus esmeraldcnsis Miller, Malak. Blatter, new ser. vol. 1, p. 142, 

 pi. 15, fig. 3. 



1897. Amphici/clotus esmeraldensis Kobelt and Mollendorff, Nachrb. deutschen 



malak. Ges., vol. 29, p. 139. 

 1912. Amphicyclotus esmeraldcnsis Kobext, Martini-Chemnitz Conchylien Cabi- 

 net, vol. 1, sect. 19, p. 920, pi. 138, fig. 2. 



Shell broadly umbilicated, depressed, solid, white, reddish at the 

 apex. Base pearly. Periostracum dark chestnut. Spire conic, little 

 elevated. Whorls 5.5, or possibly 6, convex, the first 3.5 smooth, the 

 following finely striated above and deeply impressedly sulcate at the 

 periphery, with a broad smooth band at the suture. The base about 

 the funnel-shaped umbilicus is axially plicate. The last whorl is 

 subcompressed above and rounded on the base. Aperture oblique, 

 not descending, transversely elliptical, broadly incised above (sinuous) 

 with the outer lip produced and depressed ; peristome simple, moder- 

 ately thick and continuous. Operculum? 



The type was collected by Wolf in the Province of Esmeraldas, 

 Ecuador. It measures: Height, 22 mm.; greater diameter, 48 mm.; 

 lesser diameter, 40 mm. 



To the above, which is a translation of Miller's Latin description. 

 Miller adds : The single specimen was discovered by Wolf in the drift 

 of the Rio Cachabi. It had evidently been derived from the more ele- 

 vated forests. The periostracum is only partly present on the upper 

 side. It is therefore impossible to say what the color of the almost 

 smooth band below the suture, which is marked only by lines of 

 growth, may have been. The underside may have been paler. There 

 was no operculum with it. 



Miller's figure shows that the aperture is drawn out into a decided 

 auricle at the posterior angle, in which respect it resembles most 

 nearly C. rosenhergi (Da Costa). 



We have not seen specimens referable to this species. 



CALAPEROSTOMA ROSENBERGI (Da Costa) 



Plate 20, Fig-dbes 15-17 



1898. Cyclophorus rosenbergi Da Costa, Proc. Malac. Soc. London, vol. 3, p. 



82, pi. 6, fig. 9. 



1899. Amphicyclotus rosenbergi Kobelt and Mollendoeff, Nachrb. deutschen 



malak. Ges., vol. 31, p. 136. 

 1912. Amphicyclotus rosenbergi Kobext, Martini-Chemnitz Conchylien Cabinet, 

 vol. 1, sect. 19, p. 924, pi. 138, figs. 13-15. 



Shell broadly umbilicated, depressed-orbicular, burned chestnut 

 above, yellowish chestnut below. Spire depressed-conic; apex 



