AKT. 18 SMALL SHELLS DREDGED BY " ALBATROSS '' DALL 93 



edge which is buried in the suture; the base is nearly flat with a 

 faint groove near the periphery and marked by flexuous radiating 

 incremental lines; the pillar is short and the aperture subrectangu- 

 lar; there is no axial sculpture except incremental lines, and the 

 beads are not arranged so as to give the effect of axial ribbing; on 

 the early whorls the sculpture is smaller but similar; the nucleus 

 may include beside the protoconch, which is smooth, 2 or sometimes 

 3 larval whorls. In the present specimens the protoconch and lar- 

 val whorls have been worn smooth (if they originally had sculpture) ; 

 the nepionic whorl shows an undulated smooth thread between 

 two minutely beaded threads. Length of 16 whorls and nucleus, 8; 

 maximum diameter, 2 mm. U. S. Nat. Mus. Cat. No. 108343. 

 Off Georgia, three specimens. 



, TRIPHORA (BIFORINA) GEORGIANA, new species 



Shell small, whitish, acute conic, straight sided, with a brown nu- 

 cleus consisting of a smooth protoconch and 2 succeeding whorls 

 sculptured with 2 equal spiral threads, and numerous finer retrac- 

 tively flexuous axial threadlets; these are succeeded by 15 slowly 

 increasing flattish whorls; spiral sculpture of 2 subequal promi- 

 nently beaded cords with 1 smaller undulated thread in front of 

 them, which is the periphery of the base; there are also fine spiral 

 striae visible under magnification in the interspaces; there is no axial 

 sculpture except incremental lines, but the beads on the 2 cords 

 are arranged in axially linked pairs which can be followed up the spire 

 and give it a partially ribbed aspect; the axial lines of beads make 

 about half a revolution around the spire; the base of the immature 

 shell is flattish, with flexuous incremental lines and a sharp groove 

 just inside the periphery, the canal is very short and slightly twisted. 

 Length of nucleus and 15 whorls, 7.5; maximum diameter, 15 mm. 

 U. S. Nat. Mus. Cat. No. 333516. 



Oft' Georgia, six specimens. 



There are 15 beads on the anterior cord of the last whorl. 



TRIPHORA (BIFORINA) INDIGENA, new species 



Shell small, whitish, with a brown nucleus consisting of the proto- 

 conch and 3 larval whorls, and 13 or more subsequent whorls; the 

 spire is acute conical, the sides nearly straight, but the whorls slightly 

 convex; the larval whorls are sculptured as in the preceding species; 

 the adult whorls are spirally sculptured by two beaded cords with a 

 smooth threadlet in front of them and a row of separate slightly 

 smaller beads between the posterior cord and the preceding suture; 

 there are 16 beads on the anterior cord of the penultimate whorl; 

 these beads occur at the intersections of the cords with the same 

 number of retractively oblique flattish narrow riblets with subequal 



