94 PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



interspaces, the series of which may be followed up the spire which 

 they about one quarter encircle; the last whorl in the type speci- 

 men is partially preserved, except the outer lip of the aperture, 

 and is smooth on the rounded base except for flexuous incremental 

 lines, with a very short canal and a trace of the narrow sutural sulcus. 

 Length of 13 whorls, 7 ; maximum diameter, 1 .6 mm. U. S. Nat. Mus. 

 Cat. No. 108345. 



Oflt Georgia, two specimens. 



A third species much larger than either of the preceding is indi- 

 cated by fragments from off Fernandina, with three oblique rows of 

 beads connected by rather sharp riblets in the later whorls, the pos- 

 terior row splitting into two smaller spirals near the adult stage. 

 The shell is thinner and more fragile than either of the others, and 

 the latest whorl preserved has an axial length of 2 and a maximum 

 diameter of 3 mm. U. S. Nat. Mus. Cat. No. 108079. 



Subgenus Strobiligera Dall, 1924 ^ 



TRIPHORA (STROBILIGERA) POMPONA, new species 



Shell small, white, slender, with a smooth inflated white proto- 

 conch of a whorl and a half, directly followed by 21 or more whorls 

 of the adult sculpture; form acute conic, straight sided, the suture 

 not constricted ; spiral sculpture of a strong beaded cord at the pe- 

 riphery of the whorl and a similar one in front of it, the summits of 

 the beads subcarinate; behind the posterior cord and between it and 

 the preceding suture are two or three hardly undulated simple thread- 

 lets; in front of the anterior cord is an inconspicuous thread which 

 is the periphery of the base and more or less obscured by the. suc- 

 ceeding whorl; the beads on the two cords are obliquely linked in 

 pairs by an axial ridge, and the series of pairs, though not conspicuous, 

 may be followed up the spire; the axial sculpture otherwise is chiefly 

 incremental; the immature base is flattish with flexuous incre- 

 mental lines and a sharp spiral thread just inside the peripheral 

 margin; the canal is very short and slightly recurved. Lengths of 

 the nucleus and 20 whorls, 15; maximum diameter, 2.5 mm. U. S, 

 Nat. Mus. Cat. No. 108339. 



OfT Georgia, very numerous, but mostly in poor condition. The 

 inflated protoconch differs considerably in size, some being much 

 larger than others, one specimen having a diameter 50 per cent 

 greater than the next succeeding whorl, while others exceed that 

 whorl very little. A larger but imperfect specimen measures about 

 20 mm. in length. 



A variety (?) with exactly the same type and arrangement of sculp- 

 ture, but the beading less prominent and the shell more slender and 

 compact, measures 10 mm. for 15 whorls, and has a maximum dia- 



» Type Triphora ibex Dall (1889). Antilles. See Proe. Biol. Soc. Wash., vol. 37, p. 89, Feb. 21, 192^. 



