THE CYCIiOPHORID LAJSTD MOLLUSlKS OF AMERICA 157 



this. In addition there are obscure darker spiral lines on the upper 

 whorls. The nucleus consists of about one smooth turn followed by 

 whorls which bear 5 moderately strong spiral cords, which are of 

 equal strength and spacing. The space between the first of these and 

 the summit is about three times as wide as that separating the cords. 

 On the last whorl, however, these spiral cords disappear. In addition 

 to this the shell is marked by incremental lines. Suture moderately 

 impressed. Periphery well rounded. Base moderately convex, marked 

 by incremental lines only. A strong spiral cord limits the umbilicus 

 at its outer edge, terminating in a notch at the peristome. The um- 

 bilicus is moderately broad, and its wall is marked by riblike incre- 

 mental lines. Aperture slightly oblique, almost circular, produced 

 into an angle at the posterior angle and notched at the base of the 

 columella ; peristome simple. Operculum unknown. 



The specimen described and figured is one of three, U.S.N.M. No. 

 316107, bearing the locality label "Ecuador." It has 5.4 whorls and 

 measures : Height, 22.5 mm. ; greater diameter, 30.6 . mm. ; lesser 

 diameter, 23.2 mm. 



The large size readily distinguishes this species from L. hartletti 

 (H. Adams). 



LAGOCYCLUS BARTLETTI (H. Adams) 



Plate 20, Figures 4, 5 



1870. Aperosfoma lartletti H. Adams, Proc. Zool. Soc. London, 1S70, p. 375, pi. 27, 



figs. 1, la. 

 1876. Cyclotus hartletti Pfeiffee, Monographia pneumonopomorum viventium, 



vol. 4, p. 35. 

 1897. Neocijdotus (Neocyclotus) hartletti Kobelt and Mollendorff, Nachrb. 



deutschen malak. Ges., vol. 29, p. 137. 

 1923. Poteria (Neocyclotus) hartletti H. B. Baker, Occ. Pap., Mus. Zool. Univ. 



Michigan, No. 137, p. 32. 



Shell depressed, broadly umbilicated, solid, closely plicately striate, 

 yellowish white below the epidermis with a white band at the suture. 

 Spire moderately elevated, suture impressed; whorls 6, moderately 

 convex, the last with a prominent rib boundmg the umbilicus; 

 aperture oblique, subcircular, white within; peristome continuous, 

 simple, subacute, angulatedly produced above, canaliculate at the 

 columellar end. Operculum ? Height, 14 mm. ; greater diameter, 21 

 mm. ; lesser diameter, 19 mm. 



As we have not seen shells of this species, we copy Adams' figure 

 and give a translation of his description. 



It was collected by E. Bartlett in eastern Peru. 



FILOCYCLUS, new genus 



Shell helicoid, marked by feeble spiral grooves and quite strong 

 incremental lines. The umbilical wall bears two strong spiral keels. 



428349—42 11 



