530 PROCEEDINGS OF THE NATIONAL MUSEUM.' vol. xxxm. 



The type (Cat. No. 15520, U.S.N.M.) was collected ])y J. G. Swan 

 at Neah Bay, Washino-ton. It has 5^ whorls w^hich measure: Length 

 6.4 mm., diameter 3.5 mm. 



The specimen upon which Doctor Carpenter fixed the name j)upt- 

 formk (Cat. No. 15520rt, U.S.N.M.) collected by J. G. Swan at Neah 

 Ba}', Washington, is not worthy of a varietal name. It is a freak, 

 having the spire less elevated, which is, perhaps, due to some injury 

 received at an early date, evidence of which seems present. It agrees 

 perfectly in every detail with the type of aatura excepting the shape 

 of the spire. 



ODOSTOMIA (AMAURA) NUCIFORMIS Carpenter. 

 Plate XLVIII, tigs. 3, 3a. 

 Odostomla naciformis Carpenter, Ann. Mag. Nat. His^t., 3d ser., XY, 1865, p. 30. 



Shell large, shortly ovate, j^ellowish to milk-white. Nuclear whorls 

 deeply immersed; only half of the last turn is seen in tilted position 

 when viewed from above. Post-nuclear whorls increasing rapidly in 

 size, well rounded, having their summits closely appressed to the pre- 

 ceding whorl. Sutures moderately well impressed. Periphery and 

 base of the last whorl well rounded. Aperture rather large, ovate, 

 white within; posterior angle acute; outer lip moderately thin at the 

 edge, thicker within; columella short, strongly curved, with a strong 

 oblique fold at its insertion; reenforced by the attenuated base; parie- 

 tal wall covered by a weak callus. 



The type (Cat. No. 15517«, U.S.N.M.) comes from Neah Bay, Wash- 

 ington. It has 5 post-nuclear whorls which measure: Length 7.7 mm., 

 diameter ■i.-I mm. 



Odostomld {Amcnira) miclforinis Carpenter differs from its sub- 

 species in having the spire more depressed than either of them. It is 

 a short, stubby inflated, ovoid shell, having the summit of the whorls 

 closely appressed. 



ODOSTOMIA (AMAURA) NUCIFORMIS AVELLANA Carpenter. 



Plate XLVIII, figy. 1, In. 



Odustumki (? var. ) avellana Carpenter, Ann. Mag. Nat. Hist., 3d ser., XV, 

 1865, p. 30. 



Shell large, elongate-ovate, yellowish to milk-white. Nuclear whorls 

 deeply vertically immersed; only part of the last volution is visible 

 when viewed from above, their axis evidently being at a right angle 

 to the axis of the later whorls. Post-nuclear whorls increasing rapidly 

 in size, early ones well rounded, later ones less so, their summits being 

 closely appressed to the preceding whorl. Sutures well impressed, 

 simple. Periphery and base of the last whorl well rounded, the hitter 



