2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



axial ribs which weaken on the posterior sinus. The axial ribs and 

 intercostal spaces are crossed by rather heavy spiral cords, finer spiral 

 lirations between the heavier cords, and hairlike incremental lines. 

 The combination of these last two elements produces a fine clothlike 

 pattern, while their junction sometimes almost appears granulose. The 

 columella is stout, and there is a weak umbilical chink at its anterior 

 termination. The aperture is rather short, deeply channeled anteriorly 

 and posteriorly, the posterior sinus falling a little anterior to the sum- 

 mit. The outer lip is protracted into a clawlike element between the 

 anterior limit of the posterior sinus and the stromboid notch. 

 Type. — Biichema tainoa. 



CARINODRILLIA (BUCHEMA) TAINOA, n. sp. 



Plate I, figs. 5, 6; plate 2, fig. 7; plate 3, fig. i 



Shell rather large, elongate-conic. Nucleus amber-colored, re- 

 mainder of shell of various shades of brown, the intercostal spaces 

 darker than the ribs. Summit of the whorls marked by brown spots 

 separated by lighter-colored intervals. Nuclear whorls 2.2, the first 

 1.9 well rounded, smooth, the last .3 marked by fine axial lirations, 

 slightly retractively curved at the summit, which become narrow axial 

 riblets before passing into the postnuclear sculpture. Postnuclear 

 whorls rounded, marked by very heavy humplike axial ribs which 

 terminate at the anterior margin of the posterior sinus. Of these ribs, 

 which are about as broad as the spaces that separate them, 9 occur 

 upon the first and second, 10 upon the third and fourth, and 11 on the 

 fifth and last whorls. In addition, the entire surface of the shell is 

 marked by fine incremental lines. The spiral sculpture consists of 

 strong cords, which are equal in strength and pass over the axial ribs. 

 The spaces between them are almost as wide as the cords. Of the 

 cords, three are present on the first to fourth whorls, and four on 

 the fifth and sixth. There is a moderately strong cord at the appressed 

 summit on all the whorls. In addition to the strong sculpture, there 

 is a secondary and much weaker spiral sculpture consisting of fine 

 lirations which are present on the posterior sinal region and between 

 the strong cords over the axial ribs. Of these, three are present on 

 the first whorl between the cord at the summit and the cords anterior 

 to the sinus. On the second whorl four occur between the cord at the 

 summit and the first strong cord. The third whorl is marked by seven 

 lirations in the posterior sinal region, and two between the first and 

 second, second and third, and third cord and the suture. On the fourth 

 whorl there are 14 between the cord at the summit and the first strong 



