40 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



threads, the posterior two paired, the others more distant, on the 

 last whorl about 15, becoming obsolete on the canal and slightly 

 swollen where they override the ribs; on the base these threads are 

 slightly undulated by their intersection with the lines of growth, and 

 many of the interspaces have one (or even two) much finer inter- 

 calary threads; anal fasciole behind the shoulder but not quite at 

 the suture, wide, smooth, or marked with concave growth-lines 

 corresponding to the anal sulcus, somewhat excavated, and having 

 a single thick obscurel}^ defined thread between it and the suture; 

 aperture rather wide ; anal sulcus wide, shallow ; outer lip thin, inter- 

 nally smooth, arcuately protractive, receding toward the canal, 

 slightly crenulate by the spiral sculpture; pillar straight, smooth; 

 canal nearly straight, ample. Length of shell exclusive of the nu- 

 cleus 25, of aperture 14, maximum diameter 10 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. Type- 

 specimen from the Post collection, U. S. Nat. Mus. No. 165032. 



DRILLIA LAPENOTIERI Dall. 



Plate 8, fig. 4. 



Pleurotoma lapenotieri Dall, Trans. Wagner Inst., vol. 5, p. 1199, pi. 43, 

 fig. 14, 1900. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida, Dall. 

 U. S. Nat. Mus. No. 130351. 



This species recalls some of the large Oligocene forms of Santo 

 Domingo. Only one specimen has so far been obtained. 



DRILLIA SEVERINA, new species. 



Plate 5, fig. 4. 



Shell with a smooth rather swollen nucleus and about eight 

 sculptured whorls ; suture appressed, the margin in front of it in the 

 early whorls elevated and sharp, later cordlike and swollen; anal 

 fasciole in front of it nearly smooth except for incremental lines and 

 a few very faint spirals; the fasciole is distinctly excavated; axial 

 sculpture of about (on the last whorl) 10 slightly oblique rounded 

 prominent ribs beginning at the shoulder of the whorl and becoming- 

 obsolete on the base; these are crossed by (between the sutures) four, 

 and on the last whorl by about a dozen prominent spiral cords with 

 finer threads between them and on the canal ; the intervals between 

 the cords are subequal as are those between the ribs ; the anal sulcus 

 is wide and rather shallow, the lip in front of it thin, sharp, and 

 roundly produced ; the pillar and body have a slight wash of callus ; 

 the canal is shorter than the aperture, rather deep and wide, slightly 

 recurved. 



