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 diameter 19 mm. U. S. Nat. Mus. No. 

 333024. 



Habitat. Uruguay River, Dept. of Paysandu; 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 (Fr. ) 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 



