20 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



the parietal wall, in the posterior portion of which it becomes decidedly 

 thickened. Ground color cream yellow; intercostal spaces and 

 slight extensions of their areas posteriorly across the sulcus and the 

 summit of the keel chestnut brown. The same coloration appears 

 within the aperture. 



The type and one other specimen, Cat. No. 186993, U.S.N.M., were 

 collected at Port Alfred (Coll. No. 525). The type has the last seven 

 whorls and measures: Length, 33.5 mm.; diameter, 11.8 mm. 



Cat. No. 186998, U.S.N.M., contains an additional specimen from 

 the same locality (Coll. No. 530). 



CLAVATULA HELENA, new species. 

 Plate 8, fig. 2. 



Shell moderately large, spindle shaped, ground color wax yellow, 

 upon which are disposed blotches and streaks of chestnut brown. On 

 the spire, the anterior half of the intercostal spaces between the 

 sutures, is brown; nuclear whorls decollated; postnuclear whorls 

 flattened, with a narrow, well-rounded keel posterior to the sinus; 

 the sinus itself appears as a well-impressed, broad, shallow sulcus, the 

 two extending over the posterior half of the shell between the sutures. 

 The anterior half is marked with feeble, decidedly protractive, axial 

 ribs, of which 8 occur upon the first and second, 10 upon the third 

 and fourth, and 12 upon the penultimate turn. The spaces between 

 these ribs are about as wide as the ribs. In addition to the above 

 sculpture, the spire is marked by exceedingly fine lines of growth. 

 Sutures moderately impressed; periphery of the last whorl well 

 rounded. Base moderately long, marked by the feeble continuations 

 of the axial ribs, and about 20 poorly denned spiral threads which are 

 separated by narrow, incised lines. These threads are a little better 

 developed on the anterior half than on the posterior half of the base. 

 Aperture elongate-oval; posterior angle acute; outer lip quite thick, 

 notched at the sinus; inner lip appressed to the base; parietal wall 

 covered by a very thick callus. 



The type and two specimens, Cat. No. 227761, U.S.N.M., come 

 from Port Alfred (Coll. No. 856). The type has lost the nuclear 

 whorls and probably the first post nuclear turn. The six remaining 

 measure: Length, 28 mm. ; diameter, 12 mm. 



CLAVATULA, species? 



Cat. No. 186995, U.S.N.M., contains a worn specimen from Port 

 Alfred allied to C. lialiplex (Coll. No. 527). 



Genus DRILLIA Gray. 

 DRILLIA ROUSI Sowerby. 



Cat. No. 186673, U.S.N.M., two specimens from Port Alfred (Coll. 

 No. 29). 



