THE NAUTILUS. 133 
three to a millimeter, at first concentric but about the anterior 
third of the valve becoming oblique, and becoming obsolete 
near the posterior third; beaks inconspicuous; interior chalky 
white, the muscular impressions subequal, the pallial sinus 
rounded, in front, mostly free from the pallial line and falling 
a little short of the anterior adductor scar; the ligament is short 
and the margins smooth. Length 35; height 23; diameter 8; 
the vertical from the beaks behind the anterior end 17 mm- 
U. S. Nat. Mus. Cat. No. 333023. 
AMPULLARIA (FELIPPONEA) ELONGATA N. Sp. 
Shell solid, conic, of three and a half flattish whorls separa- 
ted by a distinct, almost channelled suture (the apex deeply 
eroded); shell substance grayish to slate color, with irregular 
broad spiral purple lines, the whole covered with an olivaceous, 
thick, polished, dehiscent periostracum of a brittle character; 
base rounded, umbilicus only a narrow chink behind the thin 
raised inner lip; aperture pear-shaped, smooth inside, showing 
the color bands; margin sharp-edged, not continuous across the 
body. Height of decollate shell 29; of last whorl 25; of aper- 
ture 17; of maximum diameter19 mm. U. S. Nat. Mus. No. 
333024. 
Habitat. Uruguay River, Dept. of Paysanda; Dr. F. Felip- 
pone. 
It is interesting to get another and quite distinct species of 
this subgenus which seems characteristic of Uruguay River 
fauna. The present species differs most obviously from the 
type, F. neritiniformis, in the flat-sided spire and absence of an 
umbilicus. 
THE GENUS PLEBECULA LOWE. 
BY T. D. A. COCKERELL. 
At the fossil-beds near Canigal, Madeira, the large globular 
shells of Plebecula bowditchiana (Fér.) occur in hundreds of 
thousands weathered out of the fine sand. In Porto Santo we 
find similar deposits, but nearly all the species are different, in 
