186 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



spaces between the spiral lidges on the base and between the sutures 

 are marked by closel}^ placed, exceedingly slender, raised axial 

 threads. Aperture pyriform, somewhat effuse anteriorly, posterior 

 angle acute; columella short, curved, reenforced b}-^ the attenuated 

 base, free only at its extreme anterior end, with an oblique fold near 

 its insertion; parietal wall covered by a thin callus. 



The type (Cat. no. 107440, U.S.N.M.) was dredged by Dr. C. F. 

 Newcombe, in 10 to 15 fathoms, at Cumshewa Inlet, Queen Charlotte 

 Island, British Columl)ia. It has four post-nuclear whorls, which 

 measure: Length 2.2 mm., diameter 0.9 mm. 



ODOSTOMIA (MENESTHO) EXARA Dall and Bartsch. 



Plate 2L lig. 1. 



Odostomia (Mcnestho) exara Dall and Bartsch. Proc. U. S. Nat. Mns., vol. 3r!, 

 1907, pp. 521, 522, pi. 46, fig. 6. 



Shell elongate-ovate, subdiaphanous. Nuclear whorls smooth, 

 deeply immersed in the first of the succeeding turns, only a part of 

 the last one appearing above it. Post-nuclear whorls somewhat 

 inflated, well rounded, marked on the first whorl by 8, on the second 

 by 12, on the third by 14, and on the penultimate between the sutures 

 by 20 subequal and equally spaced, low, depressed spiral cords which 

 are sej)arated by narrower channels. Periphery and base of the last 

 whorl inflated, sculptured like the spire by probably 20 spiral cords. 

 In addition to the spiral sculpture the entire surface is marked by fine 

 incremental lines which are best marked in the spaces between the 

 cords. -Aperture oval, somewhat eft'use anteriorly; posterior angle 

 acute; outer lip thin, showing the external sculpture within; columella 

 decidedly curved, reenforced by the attenuated base, free only at its 

 anterior extremity, where it is somewhat revolute, provided with a 

 prominent fold at its insertion which appears as the thickened inflec- 

 tion of the columella; parietal w^all covered by a thin callus. 



The type (Cat. no. 196250, U.S.N.M.) comes from Pacific Grove, 

 Monterey, California. It has five post-nuclear whorls and measures: 

 Length 3.9 mm., diameter 2.1 mm. 



ODOSTOMIA (MENESTHO) ZIZIPHINA Caipenter. 



Plate 20, fig. 2. 

 Farthenia zizipMna Carpenter, Cat. Mazatlan Shells, 1856, p. 416. 



Shell conic, white. Nucleus mammillated. Post-nuclear whorls 

 marked by five spiral lirations of which two appear between the 

 sutures, one at the periphery and two on the base. Columella with 

 an oblique fold. 



To the above, Doctor Carpenter adds: "Tablet 1967 (Liverpool col- 

 lection) contains a small Ziziphinus-shaped shell, very young, dif- 



