26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



penultimate turn bears only 12. The intercostal spaces are about as 

 wide as the ribs, and the gouged-out portion terminates at the pe- 

 riphery. Suture well impressed, rendered wavy by the summit of 

 the axial ribs. Periphery well rounded. Base hemispherical, smooth. 

 Aperture broadly oval ; columella slender, with a weak fold near its 

 insertion; outer lip thin. 



The type, U.S.N.M, No. 561625, comes from the Pliocene beds 

 of North St. Petersburg, Fla. It is a complete specimen, having 9.5 

 postnuclear whorls and measures : Length 4.2 mm., diameter i mm. 



TURBONILLA (CHEMNITZIA) CACUSI, new species 

 Plate 4, figure 4 



Shell elongate-conic, small, stout, cream-yellow. Nucleus decolt- 

 lated. Postnuclear whorls flattened, marked by very strong, decidedly 

 protractively slanting ribs, which terminate at the periphery. Of 

 these, 15 are present on the last whorl of the type. The gouged-out 

 intercostal spaces are a little narrower than the ribs and terminate 

 at the periphery. Suture well impressed, rendered somewhat wavy 

 to the summits of the ribs. Periphery rounded. Base short, strongly 

 rounded, smooth. Aperture decidedly obliquely subquadrate; colu- 

 mella moderately stout, provided with a weak fold near its insertion ; 

 outer lip thin. 



The type, U.S,N,M. No. 561626, comes from the Pliocene deposits 

 of North St. Petersburg, Fla. It has 8.8 whorls and measures: 

 Length 4 mm., diameter i.i mm. Another specimen is in the collection 

 of the A.N.S.P. 



TURBINELLA (CHEMNITZIA) CERBERUSI, new species 



Plate 4, figure 7 



Shell elongate-turrited, small, cream-yellow. The nucleus and 

 probably the first 1.5 postnuclear whorls are decollated. The remain- 

 ing whorls are flattened and crossed by slender, slightly wavy, de- 

 cidedly protractively slanting axial ribs, of which 13 are present on 

 the last whorl of the type. These ribs extend equally strong from the 

 summit to the periphery. The intercostal spaces are moderately exca- 

 vated and a little narrower than the ribs ; they terminate at the pe- 

 riphery. Suture well impressed, rendered slightly sinuous by the 

 summit of the ribs. Periphery well rounded. Base hemispherical, 

 smooth. Aperture?; columella short, provided with a fold near its 

 insertion; outer lip? fractured. 



