EUC ALODIUM. 



Pupa decollata NYST, Bull de 1'Acad. Roy. des .Sci. et 

 Belles-Lettres de Bruxelles, viii, 1841, p. 344, upper fig. of 

 plate. Not Eucalodium decollatum Nyst, CROSSE & FISCH., 

 Moll. Mex. p. 363, pi. 14, f. 3, 3a, Cylindrella decollata PFR., 

 Monogr. viii. p. 427. v. MART., Biol., p. 260. 



I have copied Nyst's figure and the substance of his descrip- 

 tion. These indicate a species much like E. ghiesbreghti. I 

 am wholly disposed to consider that the long-lost species of 

 Nyst was based upon a pale and weather-bleached specimen of 

 that well-known species. The strong fold of the columella, 

 shown in Nyst's figure, shows that decollata was a member of 

 the typical section of Eucalodium, having a cork-screw shaped 

 axis ; and the number of whorls, solidity, size, etc., indicate the 

 correctness of my conclusion. I have figured (pi. 1, fig. 1) 

 a shell agreeing with ghiesbreghti in everything but color. It 

 is very pale brown or isabella-tinted, with slightly over 9 

 whorls, and measuring, length 70, diam. 2Qy 2 mm. This shell 

 seems to me to practically fulfill the requirements of Nyst's 

 description. 



Crosse and Fischer have identified as decollata a much 

 smaller shell, length 60, diam. 16% mm. (pi. 4, fig. 8), from 

 Yera Paz, in northern Guatemala, collected by Morelet. Al- 

 though their result was worked out with great care, it seems 

 to me erroneous. The finding of nearly white specimens of 

 E. ghiesbreghti gives us a shell in agreement with the original 

 description of decollata, and from the same locality; the ori- 

 ginal specimen of decollatum having been obtained by Ghies- 

 breght in the state of Tabasco, southeastern Mexico. 



Var. ghiesbreghti (Pfeiffer). PL 5, figs. 18, 19, 20, 21. 



Shell arcuate-rimate, cylindric-turreted, truncate, solid, 

 blackish brown ; spire tapering, broadly truncate ; 10-11 whorls 

 remaining, a trifle convex, the upper ones closely striate, 

 lower lightly sculptured with waved folds ; last whorl free in 

 front, striate, angulate above, obtusely carinate below the 

 middle. Aperture oblique, subangulate-oval, the base some- 

 what effuse, with a strong compressed fold twisting around 

 the columella; peristome continuous, flexuous, whitish, nar- 



