NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 9 



specimens (Locklin No. 2757) from the same source. In addition to 

 these the following specimens were sent to the Academy of Natural 

 Sciences of Philadelphia (hereinafter abbreviated, A.N.S.P.) : No. 

 1419 C/D : 2 ; 2618 : i ; 1419 : i ; 2686 : 2. 



Genus LONGCHAEUS Morch 



1875. Longchaeus Morch, Malak. Blatter, vol. 22, p. 158. 



Shell elongate-turrited, not umbilicate, having three columellar 

 folds, a basal fascicle and peripheral sulcus, with axial ribs in sub- 

 genus Pharcidella and without them in Longchaeus s.s., both have 

 microscopic lines of growth and spiral striations. 



KEY TO THE SUBGENERA OF LONGCHAEUS 



Axial ribs present Pharcidella 



Axial ribs absent Longchaeus 



Subgenus Pharcidella Dall 

 1889. Pharcidella Dall, Bull. Mus. Comp. Zool., vol. 18, p. 333. 



Shell elongate-turrited, not umbilicate, having three columellar 

 folds, a basal fasciole, and peripheral sulcus. The whorls are rendered 

 crenulated at the summit by axial ribs which extend down over most 

 of the whorls; microscopic spiral striations and lines of growth are 

 present. 



Type: Pharcidella folinii Dall. 



LONGCHAEUS (PHARCIDELLA) CALESI, new species 



Plate I, figure 4 



Shell elongate-turrited, cream-yellow. Nuclear whorls about 1.5, 

 small, obliquely immersed in the first postnuclear turn. The post- 

 nuclear whorls increase very regularly in size and are separated by 

 a deeply channeled suture. They are flattened; the first two are 

 smooth ; beginning with the third turn the whorls are marked by stout 

 axial ribs, which are much wider than the spaces that separate them ; 

 these ribs are strongest at the summit, which they crenulate, and 

 gradually become weaker toward the peripheral sulcus, vanishing 

 shortly before reaching this. The deep peripheral sulcus is crossed 

 by fine irregularly closely spaced raised lines of growth. Base semi- 

 globular, marked by lines of growth. Aperture obliquely oval; 

 columella with three folds, of which the posterior is much stronger 



