THE CYCLOPHORID LAND MOLLUSKS OF AMElRICiA 165 



ately below the periphery. A few indications near the aperture would 

 lead us to believe that in perfect specimens all the spiral threads are 

 darker than the ground color. The sculpture consists of strongly 

 raised narrow spiral cords, which are not regularly distributed, but 

 which are absent on the posterior half between the summit and the 

 periphery. On the anterior half in the specimen figured 8 keels are 

 present, which are not quite of equal spacing and are separated by 

 deeply impressed concave grooves. The summit of the whorls is 

 appressed; the suture therefore is inconspicuous. Periphery well 

 rounded. Base inflated, well rounded and marked by 13 spiral keels 

 of about the same strength and spacing as those on the spire. The 

 last three near the edge of the umbilicus are very weak, while the spaces 

 separating these keels are concave and, like those on the spire, marked 

 by numerous hairlike incremental lines. The umbilicus is broad and 

 its wall is marked by riblike axial incremental lines. Aperture broadly 

 ovate, narrowly protracted at the posterior angle; peristome thin, 

 rendered slightly fluted on the outer and basal lip by the ribs on the 

 outside. Operculum corneous with central nucleus and with the 

 lamella fimbriated at the outer margin. 



The specimen described and figured, U.S.N.M. No. 523514, was col- 

 lected by Oscar Haught on the road between Quevedo and Quito, 

 Ecuador, at an altitude of about 500 meters. It has 6 whorls and 

 measures : Height, 21.0 mm. ; greater diameter, 36.8 mm. ; lesser diam- 

 eter, 27.3 mm. 



It belongs to the group of C. leai^ from which its much larger size 

 will readily distinguish it. 



CALAPEROSTOMA LEAI, new name 



Plate 21, Figubes 17-19 



1834. Cydostoma striata Lea, Trans. Amer. Philos. Soc, vol. 5, p. 196, pi. 19, 

 fig. 77 (not C. striatum Sowerby, A catalogue of the shells contained in 

 the collection of the . . . Earl of Tankerville, p. 41, 1825; or C. striata 

 Quoy and Gaimard, Voyage de la corvette V Astrolabe . . ., Zool. vol. 2, p. 

 186, 1832). 



Shell depressed-helicoid of whitish ground color with spiral bands 

 of brown. These dark bands consist of a broad zone at some little 

 distance from the summit and the tops of the spiral cords. The early 

 whorls are rose colored. The nucleus consists of about 2 smooth turns ; 

 the remaining whorls are marked by strong spiral cords excepting the 

 white zone near the summit, which is free of them. The dark zone 

 below this has 4 feeble cords, and anterior to this 6 additional much 

 stronger cords are present. In addition to this the spire is marked 

 by decidedly retractively curved, rather coarse incremental lines. 

 Suture inconspicuous. Periphery rendered slightly angulated by the 



