516 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



ODOSTOMIA (CHRYSALLIDA) MONTEREYENSIS, new species. 

 Plate XLVI, fig. 4. 



Shell l)roadly conic, milk-white to subdiaphanous. Nuclear whorls 

 smooth, largely immersed in the first of the succeeding turns, above 

 which only half of the last whorl projects. Postnuclear whorls sepa- 

 rated by broad, deep sutures; well rounded between the sutures where 

 they are ornamented by four strong!}^ tuberculate spiral ridges, the 

 spiral connections between the tubercles are equal to the axial connec- 

 tions or ribs, of which 10 appear upon the second, 18 upon the thir- 

 tieth, and 20 upon the penultimate whorl. The spaces inclosed between 

 the axial ribs and the spiral connections which join the rounded tuber- 

 cles are deep squarish pits. The axial ril)s extend strongly across the 

 deep peripheral channel and stop at the first subperipheral keel. Base 

 moderately long, well rounded, marked by 5 equal and subequally 

 spaced, well raised, strong, spiral keels, and a sixth, much broader, 

 low, and rounded at the columellar margin. The grooves between 

 the keels are equal to the width of the keels near the peripher}-, but 

 diminish in breadth successively from the periphery to the umbilical 

 area. They are crossed by numeious slender raised axial threads, 

 which extend up on the sides of the spiral keels, but do not cross them. 

 There are about 5 of these threads between each two ribs in the first 

 subperipheral channel; aperture oval, somewhat effuse anteriorly; 

 posterior angle acute; columella reenforced by the attenuated base, 

 against which it appears like a thickened callus, provided with a mod- 

 erately strong oblique fold at its insertion; parietal wall covered by a 

 thick callus, which ]oins the columella with the posterior angle of the 

 aperture. 



The type (Cat. No. 196281, U.S.N.M.) has 5 postnuclear whorls and 

 measures: Length, 3.0 mm.; diameter, 1.3 mm. It was collected by 

 Mr. S. S. Berry, in 12 fathoms, off" Del Monte, Montere}^ Bay, Cali- 

 fornia. Three specimens from the same station are in Mr. Berry's 

 collection. Another specimen (Cat. No. 74003, U.S.N.M.) was col- 

 lected by Doctor Canfield at Monterey, and a sixth (Cat. No. 196282, 

 U.S.N.M.) by Mr. ¥. L. Button at the same place. A seventh (Cat. 

 No. I<i2767, U.S.N.M.) was collected by Mrs. T. S. Oldroyd at San 

 Luis Obispo, California. 



ODOSTOMIA (CHRYSALLIDA) OREGONENSIS, new species. 

 Plate XLVI, figs. 10, lOa. 



Shell elongate-conic, slender, subdiaphanous to milk-white. Nuclear 

 whorls immersed, the last one only being visible. This is some- 

 what tilted and marked by three strong narrow spiral keels and 

 many slender raised axial threads which cross the grooves between 



