Dall and /><(rff<c/i — 77ic Pijnmudellu'CB. 15 



The type, number 130,023 U. S. Xalioiuil Museum colleet i( n, is a 

 fossil, cominsi' trom Ihe Oliuoceuc' (lep(jsil. al Oak (ii-ove, Sla. Hosa ("o., 

 Florida. It has six and one-hall' iKistnuclear -ulioris which measure: 

 long., 3.1 mm.; diam., 1.4 mm. 



Turbonilla ( Baldra) archeri sp. no\ . 



Shell small, elongate-conic, turriculated, milk-white. Nuclear whcjrls 

 two and one-half, helicoid, about one-lourlh immersed in Ihe first jiost- 

 iiuclear whorl. haviuL;' ihejr axis al a riyht angle to the axis of the later 

 whorls. Postnuclear whorls moderately well ronndrd, having cuspitlat- 

 ed tabulated shoulders and a spiral ridge at the summit and the peri- 

 phery. Axial ribs prominent, narrow, flexuose, about one-third as wide 

 as the intercostal spaces, sixteen occur upon the hist, eighteen upon 

 the fourth and the penultimate whorls. Intercostal spaces decidedly 

 depressed between the spiral ridges, crossed by many subequally 

 spaced microscopic spiral striations. Suture channelled. Periphery 

 of the last whorl augulated, rendered somewhat crenulated by the 

 axial ribs which extend feebly over the base to Ihe umbilical region. A 

 broad, depressed tumid ridge extends across the anterior half of the 

 base, and the space between the posterior termination of this ridge and 

 the peripheral ridge appears somewhat concave. Entire base finely and 

 closely spirally striated. Aperture subo\-al, posterior angle obtuse, 

 outer lip thin, angulated at the shoulder and periphery; columella 

 straight, slightly reflected; columellar fold obsolete or internal; parietal 

 wall covered by a thin callus. 



The type and another specimen are registered as number 58,016 in 

 the collection of the Academy of Natural Sciences, Philadelphia. They 

 were collected by S. Archer, at Singapore. The type has seven postnu- 

 clear whorls and measures: long.. 3.3 mm.; diam., 1.3 mm. 



Odostomia (Vilia) pilsbryi sp. nov. 



Shell.slender, milk white. Nuclear whorls two and one half, helicoid, 

 a little more than one-third immersed in the first postnuclear whorl, 

 having their axis almost at a right angle to the axis of the later whorls. 

 Postnuclear whorls flattened, or even slightly concave in the middle, be- 

 tween the sutures; contracted near the summit, the posterior portion 

 appearing as a strong, rounded, spiral keel, separated from the rest of 

 the whorl by a spiral groove. Axial ribs prominent, scarcely indicated 

 on the spiral keel but beginning strong at the groove in front of the 

 keel and extending to the umbilical region, gradually diminishing in 

 strength from the periphery to the anterior termination. These ribs are 

 broadest and strongest at this posterior boundary, just anterior to the 

 groove and lend the shell a coronated appearance at this place. About 

 .sixteen of them appear on the second and twenty upon the penultimate 

 whorl. Periphery and ba.se well rounded. Sutures well impressed. 



