58 THE NAUTILUS. 



First whorl is smooth, convex and bicolored, a spiral deep reddish- 

 brown band half the width of the whorl revolving below the suture ; 

 on the second whorl this band spreads, becomes diluted, and finally 

 disappears. Last whorl grayish, with white and brown spots along 

 the periferal beaded cords. The last whorl has 5 beaded spiral 

 cords above, the first and fifth larger ; a beaded spiral lies between 

 the two cords at the periferal angles. The base has 7 beaded spirals, 

 the outer one and three inner larger than the others. Suture chan- 

 neled. Alt. 2.3, diam. 4.6 mm. 



Waikiki Beach, Honolulu, H. I. (F. Stearns). Types in the 

 collection of the Academy of Natural Sciences of Philadelphia, No. 



93833. 



Differs from typical T. discoidea Pease in having one more spiral 

 row of beads on the upper surface of the whorls and in having a 

 small spiral row of beads between the two peripheral larger rows. 

 It is also darker in color. The type specimens were picked from 

 shell-sand by Dr. V. Sterki, in whose honor it is named. The same 

 form was taken at the Marquesas Islands by C. D. Voy. 



TURBONILLA (CHEMNITZIA) THAANUMI n. Sp. Fig. 8. 



The shell is very slender, turrite, slowly tapering, a little more 

 rapidly so near the summit; somewhat translucent white. One 

 nuclear whorl is planorboid, its axis not quite at a right angle with 

 that of the shell, but a little oblique. Post-nuclear whorls are 

 sculptured with rounded ribs, slightly oblique and gently sigmoid, 

 equal to the intervals, and extending from suture to suture. On the 

 last whorl there are 22 axial ribs ; and the intervals parting them 

 stop abruptly a short distance below the periphery, leaving the rest 

 of the base smooth. There is no spiral sculpture. The sutures are 

 deeply impressed ; whorls evenly convex. The aperture is about 

 one-fifth the total length, ovate. Columella nearly straight, some- 

 what concave below, gently convex above. 



Length 3.1, diam. 0.82 mm.; post-nuclear whorls 8. 



Hilo, Hawaii. Type no. 95907 A. N. S. P., collected by Mr. D. 



Thaanum. 



This species differs from the Hawaiian T. decussata Pease by the 



absence of spiral sculpture. 



